投稿時間:2022-02-02 04:23:42 RSSフィード2022-02-02 04:00 分まとめ(33件)

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AWS	AWS Partner Network (APN) Blog	IBM Telematics Hub for Insurance Companies: Crash Management, Fraud Detection, Driving Behavior, and More	https://aws.amazon.com/blogs/apn/ibm-telematics-hub-for-insurance-companies-crash-management-fraud-detection-driving-behavior-and-more/	IBM Telematics Hub for Insurance Companies Crash Management Fraud Detection Driving Behavior and MoreInsurance companies need a solution to effectively manage vehicle insurances provided to their end customers and telematics solutions are used to monitor and manage these fleets Learn how IBM developed Telematics Hub that focuses on risk analysis crash and claim management and more The solution can be extended to additional use cases and integrate with many third party IoT devices and applications for vehicle data collection	2022-02-01 18:01:40
python	Pythonタグが付けられた新着投稿 - Qiita	RubistがPythonの勉強をしてみて感じた違い	https://qiita.com/universato/items/8e392ec8dc1c590a6458	実際に試験を受けることはない気がしましたが、RubyとPythonの違い等について気になったことがいくつかありますので、何番煎じかわからないですが、記事として残しておこうと思います。	2022-02-02 03:55:04
Ruby	Rubyタグが付けられた新着投稿 - Qiita	RubistがPythonの勉強をしてみて感じた違い	https://qiita.com/universato/items/8e392ec8dc1c590a6458	実際に試験を受けることはない気がしましたが、RubyとPythonの違い等について気になったことがいくつかありますので、何番煎じかわからないですが、記事として残しておこうと思います。	2022-02-02 03:55:04
GCP	gcpタグが付けられた新着投稿 - Qiita	【GCP】App Engine で手軽にアプリケーションをデプロイする	https://qiita.com/naoki-haba/items/d2b59c81a9a005041cde	【GCP】AppEngineで手軽にアプリケーションをデプロイする概要AppEngineをGCP学習の一環で触ってみたので機能をまとめてみるAppEngineGAEとは自動でスケーリングして負荷分散してくれるインフラの管理を全て自動でやってくれるカスタムドメインにデフォルトでSSL証明書を利用できる各プロジェクトでつだけ存在できるAppEngineは、大規模なウェブアプリケーションを開発およびホスティングするための、フルマネージド型のサーバーレスプラットフォームです。	2022-02-02 03:50:19
海外TECH	Ars Technica	Gmail’s next big redesign starts rolling out next week	https://arstechnica.com/?p=1830807	colors	2022-02-01 18:23:06
海外TECH	MakeUseOf	6 Steps to Becoming a Successful Freelance Back-End Developer	https://www.makeuseof.com/steps-to-become-a-freelance-back-end-developer/	developerif	2022-02-01 18:15:04
海外TECH	MakeUseOf	Xbox One Controller Not Working? Tips on How to Fix It	https://www.makeuseof.com/tag/how-to-fix-xbox-one-controller-not-working/	Xbox One Controller Not Working Tips on How to Fix ItIs your Xbox controller not working Learn what to do if your Xbox One or Series X S controller won t connect doesn t turn on or keeps blinking	2022-02-01 18:01:24
海外TECH	MakeUseOf	What Is a Smart Lock and Why Might You Need One?	https://www.makeuseof.com/what-is-a-smart-lock/	smart	2022-02-01 18:01:23
海外TECH	DEV Community	Hackathons you can attend this weekend's and win prizes + much more	https://dev.to/hackanuj/hackathons-you-can-attend-this-weekends-and-win-prizes-much-more-4fe	Hackathons you can attend this weekend x s and win prizes much moreHackathons is a dreamworld for a programmer coder where you can connect with others make projects win prizes plus can get some amazing swag much more Here are some hackathons you can attend this weekend th th Feb UofTHacks IXDate th Feb Venue OnlineTheme Social Good communication beginner friendlyTotal Prize worth CAD categories Who can participate →Anyone who is in age →All countries→Team size membersRegister here UofTHacks IX ProSeed HackathonDate th Feb Venue OnlineTheme Covid No Low Code UI UX Total Prize worth categories Who can participate →College students any degree →All countries→Team size membersRegister here ProSeed Hackathon HackViolet Date th Feb Venue OnlineTheme Open Ended For Beginners Social GoodTotal Prize worth categories Who can participate →students college highschool →All countries→Team size membersRegister here HackViolet Black Wings Hack Date th Feb Venue OnlineTheme Social GoodTotal Prize worth categories Who can participate →Female students high school college →All countries→Team size membersRegister here Black Wings Hack SB Hacks VIIIDate th Feb Venue OnlineTheme Social Good Health beginner friendlyTotal Prize worth categories Who can participate →College Students only→All countries→Team size membersRegister here SB Hacks VII HackSC Date th Feb Venue OnlineTheme Social Good beginner friendlyTotal Prize worth categories Who can participate →College Students only →All countries→Team size membersRegister here HackSC Blueprint Cities SuccessionDate th Feb Venue OnlineTheme Social Good DesignTotal Prize worth categories Who can participate →students high school college →All countries→Team size membersRegister here Blueprint HackBU Date th Feb Venue OnlineTheme Social Good open ended beginner friendlyTotal Prize worth categories Who can participate →College Students→US students only→Team size membersRegister here Hack Be You DeisHacks Date th Feb Venue OnlineTheme Social Good Design EducationTotal Prize worth categories Who can participate →College Students→All countries→Team size membersRegister here DesiHacks GunnHacks Date th Feb Venue OnlineTheme Open Ended For BeginnersTotal Prize worth categories Who can participate →High school Students under →US only→Team size solo max team size not mentionedRegister here GunnHacks Royal Hackaway vDate th Feb Venue In personTheme Education Open endedTotal Prize worth £ categories Who can participate →Students highschool college →All Countries→Team size membersRegister here Royal Hackaway JigsawHacksDate th Feb Venue OnlineTheme Social Good beginner friendlyTotal Prize worth categoriesWho can participate →Anyone who is in age→All Countries→Team size membersRegister here JigsawHacks JigsawHacksDate ends nd week of Feb Venue OnlineTheme BlockchainTotal Prize worth not mentionedWho can participate →College Students→Indians students only→Team size membersRegister here We Accinge Hack your tomorrowDate th Feb Venue OnlineTheme Open EndedTotal Prize worth not mentionedWho can participate →Middle School and High School students only→All Countries→Team size membersRegister here Hack your tomorrow Points to be notedOpen Ended means you can build whatever you want and can use any technology you are familiar with example webdev AI ML etc Some hackathons allow cross submission which means you can submit the same project at multiple hackathons Also be active in the discord slack of the particular hackathon you are attending as there are various mini events raffles etc are also organized which you can take part in Thank you for reading this article I hope you enjoy your weekend participating in this amazing hackathons Last but not least I would really appreciate you if you would follow me on Twitter	2022-02-01 18:42:28
海外TECH	DEV Community	10 HTML and CSS Good Practices 🐅🐅	https://dev.to/codewithtee/15-html-and-css-good-practices-4608	HTML and CSS Good Practices Hey Coders Code readability and re usability are the fundamentals for development It is key to maintainability and working together with a team This article will detail the practices to improve the quality of your HTML and CSS code making it much more understandable for you as well as others reusable and maintainable HTMLSyntaxDon t forget optional closing tags Don t capitalize tags Use soft tabs with two spacesーthey re the only way to guarantee code renders the same in any environment Always use double quotes never single quotes on attributes doctypeIn HTML the doctype is the required lt DOCTYPE html gt preamble found at the top of all documents Its sole purpose is to prevent a browser from switching into so called “quirks mode when rendering a document that is the lt DOCTYPE html gt doctype ensures that the browser makes a best effort attempt at following the relevant specifications rather than using a different rendering mode that is incompatible with some specifications lt DOCTYPE html gt lt html gt lt head gt lt title gt Title of the document lt title gt lt head gt lt body gt The content of the document lt body gt lt html gt Attribute OrderFor more readable code our HTML attributes should be in some particular order classid namedata src for type href valuetitle altrole aria Classes make for great reusable components so they come first Ids are more specific and should be used sparingly e g for in page bookmarks so they come second lt a class id data toggle modal href gt Example link lt a gt lt input class form control type text gt lt img src alt gt Reducing MarkUpPractice avoiding using superfluous parent elements when writing HTML Many times this requires iteration and refactoring but produces less HTML lt Not so great gt lt span class avatar gt lt img src gt lt span gt lt Better gt lt img class avatar src gt Alt textThe alt attribute is quite useful It helps screen reader users understand what is shown in the picture Unfortunately many developers don t use it efficiently They either duplicate the text around the picture or don t add it at all lt img src V FMjpg UX jpg alt Haikyuu Banner gt CSSSyntaxWhen grouping selectors keep individual selectors keep individual selector to a single line Include one space before the opening brace of declaration blocks for legibility End all declarations with a semi colon The last declaration is optional but your code is more error prone without it Lowercase all hex values e g fff Lowercase letters are much easier to discern when scanning a document as they tend to have more unique shapes Quote attribute values in selectors e g input type text They re only optional in some cases and it s a good practice for consistency Bad CSS selector selector secondary selector type text padding px margin px px px background color rgba box shadow px px px CCC inset px FFFFFF Good CSS selector selector secondary selector type text padding px margin bottom px background color rgba box shadow px px ccc inset px fff Declaration OrderPositioning Positioning comes first because it can remove an element from the normal document flow and override box model related styles The box modelーwhether it s flex float grid or tableーfollows as it dictates a component s dimensions placement and alignment Box Model The CSS box model is essentially a box that wraps around every HTML element It consists of margins borders padding and the actual content Typography Typography is all about style proportions and spacing Good typography is not only imperative for aesthetic appeal but it also improves site usability when text legibility and readability concepts are applied Visual Misc declaration order Positioning position absolute top right bottom left z index Box model display block float right width px height px Typography font normal px Helvetica Neue sans serif line height color text align center Visual background color fff border px solid eee border radius px Misc opacity Media Query PlacementAlways try to place your media query selector close to the relevant sets to avoid bundling Also it makes your code easier to read element element avatar element selected media min width px element element avatar element selected CommentsCode is written and maintained by people Ensure your code is descriptive well commented and approachable by others Great code comments convey context or purpose Do not simply reiterate a component or class name Be sure to write in complete sentences for larger comments and succinct phrases for general notes Bad example Modal header modal header Good example Wrapping element for modal title and modal close modal header Stop using pxYou should use em and rem units Both em and rem are flexible scalable units that are translated by the browser into pixel values depending on the font size settings in your design Using px won t allow the user to control the font size based on their needs I hope you find this article helpful For daily web development threads updates and content follow me on Twitter Thank you for reading Happy Coding	2022-02-01 18:42:07
海外TECH	DEV Community	JavaScript Cheat Sheet You needed	https://dev.to/j471n/javascript-cheat-sheet-you-needed-2id	JavaScript Cheat Sheet You neededThis is the Cheat Sheet of JavaScript It contains explanations code examples basic and important operators functions principles methods and many more It provides a good overview of the language JavascriptJavaScript is a programming language that powers the dynamic behavior on most websites Alongside HTML and CSS it is a core technology that makes the web run console log The console log method is used to log or print messages to the console It can also be used to print objects and other info console log Hi there Prints Hi there Learn about console log StringsStrings are a primitive data type They are any grouping of characters letters spaces numbers or symbols surrounded by single quotes or double quotes let single Wheres my bandit hat let double Wheres my bandit hat Learn more about String NumbersNumbers are a primitive data type They include the set of all integers and floating point numbers let amount let price Learn more about Numbers BooleanBooleans are a primitive data type They can be either true or false let lateToWork true let isHoliday false Learn more about Boolean NullNull is a primitive data type It represents the intentional absence of value In code it is represented as null let x null Learn more about null Arithmetic OperatorsJavaScript supports arithmetic operators for addition subtraction multiplication division modulo Addition Subtraction Multiplication Division Modulo Learn more String lengthThe length property of a string returns the number of characters that make up the string let message good nite console log message length Prints console log howdy length Prints MethodsMethods return information about an object and are called by appending an instance with a period the method name and parentheses LibrariesLibraries contain methods that can be called by appending the library name with a period the method name and a set of parentheses Math random The Math random function returns a floating point random number in the range from inclusive up to but not including Returns a number between and Math random More about Math random Math floor The Math floor function returns the largest integer less than or equal to the given number console log Math floor Prints More about Math floor Single Line CommentsIn JavaScript single line comments are created with two consecutive forward slashes This line will denote a comment Multi line CommentsIn JavaScript multi line comments are created by surrounding the lines with at the beginning and at the end Comments are good ways for a variety of reasons like explaining a code block or indicating some hints etc The below configuration must bechanged before deployment let baseUrl More about Comments VariablesA variable is a container for data that is stored in computer memory It is referenced by a descriptive name that a programmer can call to assign a specific value and retrieve it examples of variableslet name Tammy const found false var age console log name found age Tammy false Learn more about Variables const KeywordA constant variable can be declared using the keyword const It must have an assignment Any attempt of reassigning a const variable will result in JavaScript runtime error const numberOfColumns numberOfColumns TypeError Assignment to constant variable let Keywordlet creates a local variable in JavaScript amp can be reassigned Initialization during the declaration of a let variable is optional A let variable will contain undefined if nothing is assigned to it let count console log count Prints undefinedcount console log count Prints Undefinedundefined is a primitive JavaScript value that represents lack of defined value Variables that are declared but not initialize to a vale will have the value undefined let a console log a Prints undefined Assignment OperatorsAn assignment operator assigns a value to its left operand based on the value of its right operand Here are some of them addition assignment subtraction assignment multiplication assignment division assignmentlet number Both statements will add number number number console log number Prints String ConcatenationIn JavaScript multiple strings can be concatenated together using the operator In the example multiple strings and variables containing string values have been concatenated After execution of the code block the displayText variable will contain the concatenated string let service credit card let month May th let displayText Your service billis due on month console log displayText Prints Your credit card bill is due on May th Learn more about String Concatenation String InterpolationString interpolation is the process of evaluating string literals containing one or more placeholders expressions variables etc It can be performed using template literals text expression text let age String concatenation Tommy is age years old String interpolation Tommy is age years old Learn more about String interpolation Template LiteralsTemplate literals are strings that allow embedded expressions expression While regular strings use single or double quotes template literals use backticks instead let name Codecademy console log Hello name Prints Hello Codecademyconsole log Billy is years old Prints Billy is years old Learn more about Template Literals Conditionals Control FlowControl 􀄳ow is the order in which statements are executed in a program The default control 􀄳ow is for statements to be read and executed in order from left to right top to bottom in a program file Control structures such as conditionals if statements and the like alter control 􀄳ow by only executing blocks of code if certain conditions are met These structures essentially allow a program to make decisions about which code is executed as the program runs More info about Control Flow Truthy and FalsyIn JavaScript values evaluate to true or false when evaluated as Booleans Values that evaluate to true are known as truthyValues that evaluate to false are known as falsyFalsy values include false empty strings null undefined and NaN All other values are truthyLearn about Truthy and Falsy Comparison OperatorsComparison operators are used to comparing two values and return true or false depending on the validity of the comparison strict equal strict not equal Loosed equal gt greater than gt greater than or equal lt less than lt less than or equal gt false gt true gt true true false false trueMore about comparision operators if StatementAn if statement accepts an expression with a set of parentheses If the expression evaluates to a truthy value then the code within its code body executes If the expression evaluates to a falsy value its code body will not execute const isMailSent true if isMailSent console log Mail sent to recipient if else StatementAn else block can be added to an if block or series of if else if blocks The else block will be executed only if the if condition fails const isTaskCompleted false if isTaskCompleted console log Task completed else console log Task incomplete else if ClauseAfter an initial if block else if blocks can each check an additional condition An optional else block can be added after the else if block s to run by default if none of the conditionals evaluated to truthy const size if size gt console log Big else if size gt console log Medium else if size gt console log Small else console log Tiny Print SmallMore about control flow statements Logical NOT OperatorThe logical NOT operator can be used to do one of the following Invert a Boolean value Invert the truthiness of non Boolean values let lateToWork true let oppositeValue lateToWork console log oppositeValue Prints falseMore about Logical NOT Logical AND OperatorThe logical AND operator amp amp checks two values and returns a boolean If both values are truthy then it returns true If one or both of the values is falsy then it returns false ABA amp amp Bfalsefalsefalsefalsetruefalsetruefalsefalsetruetruetruetrue amp amp true true gt amp amp gt falsetrue amp amp false false amp amp gt trueLearn more about Logical AND Logical OR OperatorThe logical OR operator checks two values and returns a boolean If one or both values are truthy it returns true If both values are falsy it returns false ABA ll Bfalsefalsefalsefalsetruetruetruefalsetruetruetruetruetrue false true gt gt truefalse false false gt gt falseLearn more about Logical OR switch StatementThe switch statements provide a means of checking an expression against multiple case clauses If a case matches the code inside that clause is executed The case clause should finish with a break keyword If no case matches but a default clause is included the code inside default will be executed Note If break is omitted from the block of a case the switch statement will continue to check against case values until a break is encountered or the 􀄳ow is broken const food salad switch food case oyster console log The taste of the sea break case pizza console log A delicious pie break default console log Enjoy your meal Prints Enjoy your mealLearn more about switch statement Ternary OperatorThe ternary operator allows for a compact syntax in the case of binary choosing between two choices decisions It accepts a condition followed by a operator and then two expressions separated by a If the condition evaluates to truthy the first expression is executed otherwise the second expression is executed let price let day Monday day Monday price price Price will be Learn more about Ternary Operator FunctionsFunctions are one of the fundamental building blocks in JavaScript A function is a reusable set of statements to perform a task or calculate a value Functions can be passed one or more values and can return a value at the end of their execution In order to use a function you must define it somewhere in the scope where you wish to call it The example code provided contains a function that takes in values and returns the sum of those Defining the function function sum num num return num num Calling the function sum More about Functions Calling FunctionsFunctions can be called or executed elsewhere in code using parentheses following the function name When a function is called the code inside its function body runs Arguments are values passed into a function when it is called Defining the functionfunction sum num num return num num Calling the functionsum Function ParametersInputs to functions are known as parameters when a function is declared or defined Parameters are used as variables inside the function body When the function is called these parameters will have the values of whatever is passed in as arguments It is possible to define a function without parameters The parameter is namefunction sayHello name return Hello name function without parameterfunction sayHello return Hello World More about Parameters return KeywordFunctions return pass back values using the return keyword return ends function execution and returns the specified value to the location where it was called A common mistake is to forget the return keyword in which case the function will return undefined by default With returnfunction sum num num return num num Without return so the function doesn t output the sumfunction sum num num num num More about return Function DeclarationFunction declarations are used to create named functions These functions can be called using their declared name Function declarations are built from The function keyword The function name An optional list of parameters separated by commas enclosed by a set of parentheses A function body enclosed in a set of curly braces function add num num return num num More about Function Declaration Anonymous FunctionsAnonymous functions in JavaScript do not have a name property They can be defined using the function keyword or as an arrow function See the code example for the difference between a named function and an anonymous function Named functionfunction rocketToMars return BOOM Anonymous functionconst rocketToMars function return BOOM Learn more about Anonymous functions Arrow FunctionsArrow function expressions were introduced in ES These expressions are clean and concise The syntax for an arrow function expression does not require the function keyword and uses a fat arrow gt to separate the parameter s from the body There are several variations of arrow functions Arrow functions with a single parameter do not require around the parameter list Arrow functions with a single expression can use the concise function body which returns the result of the expression without the return keyword Arrow function with two argumentsconst sum firstParam secondParam gt return firstParam secondParam console log sum Prints Arrow function with no argumentsconst printHello gt console log hello printHello Prints hello Arrow functions with a single argumentconst checkWeight weight gt console log Baggage weight weight kilograms checkWeight Prints Baggage weight kilograms Concise arrow functionsconst multiply a b gt a b console log multiply Prints Learn more about the arrow functions ScopeScope is a concept that refers to where values and functions can be accessed Various scopes include Global scope a value function in the global scope can be used anywhere in the entire program File or module scope the value function can only be accessed from within the file Function scope only visible within the function Code block scope only visible with in a codeblock function myFunction var pizzaName Volvo Code here can use pizzaName Code here can t use pizzaNameLearn more about the scope Block Scoped Variablesconst and let are block scoped variables meaning they are only accessible in their block or nested blocks In the given code block trying to print the statusMessage using the console log method will result in a ReferenceError It is accessible only inside that if block const isLoggedIn true if isLoggedIn true const statusMessage User is logged in console log statusMessage Uncaught ReferenceError statusMessage is not defined Global VariablesJavaScript variables that are declared outside of blocks or functions can exist in the global scope which means they are accessible throughout a program Variables declared outside of smaller block or function scopes are accessible inside those smaller scopes Note It is best practice to keep global variables to a minimum Variable declared globallyconst color blue function printColor console log color printColor Prints blue ArraysArrays are lists of ordered stored data They can hold items that are of any data type Arrays are created by using square brackets with individual elements separated by commas An array containing numbersconst numberArray An array containing different data typesconst mixedArray chicken false More about Arrays IndexArray elements are arranged by index values starting at as the first element index Elements can be accessed by their index using the array name and the index surrounded by square brackets Accessing an array elementconst myArray console log myArray console log myArray console log myArray Property lengthThe length property of a JavaScript array indicatesthe number of elements the array contains const numbers numbers length Method push The push method of JavaScript arrays can be used to add one or more elements to the end of an array push mutates the original array returns the new length of the array Adding a single element const cart apple orange cart push pear Adding multiple elements const numbers numbers push Method pop The pop method removes the last element from anarray and returns that element const ingredients eggs flour chocolate const poppedIngredient ingredients pop chocolate console log ingredients eggs flour MutableJavaScript arrays are mutable meaning that the values they contain can be changed Even if they are declared using const the contents can be manipulated by reassigning internal values or using methods like push and pop const names Alice Bob names push Carl Alice Bob Carl More about Mutable LoopsA loop is a programming tool that is used to repeat a setof instructions Iterate is a generic term that means “torepeat in the context of loops A loop will continue toiterate until a specified condition commonly known as stopping condition is met More about Loops for loopA for loop declares looping instructions with three important pieces of information separated by semicolons The initialization defines where to begin the loop by declaring the iterator variable The stopping condition determines when to stop looping The iteration statement updates the iterator each time the loop is completed for let i i lt i console log i Output learn More about For loop Reverse LoopA for loop can iterate “in reverse by initializing the loop variable to the starting value testing for when the variable hits the ending value and decrementing subtracting from the loop variable at each iteration const items apricot banana cherry for let i items length i gt i console log i items i Prints cherry Prints banana Prints apricot Looping Through ArraysAn array s length can be evaluated with the length property This is extremely helpful for looping through arrays as the length of the array can be used as the stopping condition in the loop for let i i lt array length i console log array i Output Every item in the array Nested For LoopA nested for loop is when a for loop runs inside another for loop The inner loop will run all its iterations for each iteration of the outer loop for let outer outer lt outer for let inner inner lt inner console log outer inner Output Learn more about Nested for loops While LoopThe while loop creates a loop that is executed as long as a specified condition evaluates to true The loop will continue to run until the condition evaluates to false The condition is specified before th loop and usually some variable is incremented or altered in the while loop body to determine when the loop should stop Syntax while condition code block to be executed Example let i while i lt console log i i Learn more about while loop Do…While StatementA do while statement creates a loop that executes a block of code once checks if a condition is true and then repeats the loop as long as the condition is true They are used when you want the code to always execute at least once The loop ends when the condition evaluates to false x i do x x i console log x i while i lt Prints Learn more about do while break KeywordWithin a loop the break keyword may be used to exit the loop immediately continuing execution after the loop body for let i i lt i if i gt break console log i Output Here the break keyword is used to exit the loop when i is greater than Learn more about break Iterators Functions Assigned to VariablesIn JavaScript functions are a data type just as strings numbers and arrays are data types Therefore functions can be assigned as values to variables but are different form all other data types because they can be invoked let plusFive number gt return number f is assigned the value of plusFivelet f plusFive plusFive Since f has a function value it can be invoked f Higher Order FunctionsIn Javascript functions can be assigned to variables in the same way that strings or arrays can They can be passed into other functions as parameters or returned from them as well A “higher order function is a function that accepts functions as parameters and or returns a function Callback FunctionsIn JavaScript a callback function is a function that is passed into another function as an argument This function can then be invoked during the execution of that higher order function that it is an argument of Since in JavaScript functions are objects functions can be passed as arguments const isEven n gt return n let printMsg evenFunc num gt const isNumEven evenFunc num console log The number num is an evennumber isNumEven Pass in isEven as the callback functionprintMsg isEven Prints The number is an even number True Learn more about Callback functions Array Method forEach The forEach method executes a callback function on each of the elements in an array in order Here the callback function containing a console log method will be executed times once for each element const numbers numbers forEach number gt console log number More about forEach Array Method map The map method executes a callback function on each element in an array It returns a new array made up of the return values from the callback function The original array does not get altered and the returned array may contain different elements than the original array const finalParticipants Taylor Donald Don Natasha Bobby const announcements finalParticipants map member gt return member joined the contest console log announcements Learn more about map Array Method filter The filter method executes a callback function on each element in an array The callback function for each of the elements must return either true or false The returned array is a new array with any elements for which the callback function returns true Here the array filteredArray will contain all the elements of randomNumbers but const randomNumbers const filteredArray randomNumbers filter n gt return n gt More about filter Array Method reduce The reduce method iterates through an array and returns a single value It takes a callback function with two parameters accumulator currentValue as arguments On each iteration accumulator is the value returned by the last iteration and the currentValue is the current element Optionally a second argument can be passed which acts as the initial value of the accumulator Here the reduce method will sum all the elements of the array const arrayOfNumbers const sum arrayOfNumbers reduce accumulator currentValue gt return accumulator currentValue console log sum More about reduce ObjectsAn object is a built in data type for storing key value pairs Data inside objects are unordered and the values can be of any type More about Objects Properties and values of a JavaScript objectA JavaScript object literal is enclosed with curly braces Values are mapped to keys in the object with a colon and the key value pairs are separated by commas All the keys are unique but values are not Key value pairs of an object are also referred to as properties const classOf students year Restrictions in Naming PropertiesJavaScript object key names must adhere to some restrictions to be valid Key names must either be strings or valid identifier or variable names i e special characters such as are not allowed in key names that are not strings Example of invalid key namesconst trainSchedule platform num Invalid because of the space between words Expressions cannot be keys compartment C The use of a sign is invalid unless it is enclosed in quotations Dot Notation for Accessing Object PropertiesProperties of a JavaScript object can be accessed using the dot notation in this manner object propertyName Nested properties of an object can be accessed by chaining key names in the correct order const apple color Green price bulk kg smallQty kg console log apple color Green console log apple price bulk kg Delete operatorOnce an object is created in JavaScript it is possible to remove properties from the object using the delete operator The delete keyword deletes both the value of the property and the property itself from the object The delete operator only works on properties not on variables or functions const person firstName Matilda age hobby knitting goal learning JavaScript delete person hobby or delete person hobby console log person firstName Matilda age goal learning JavaScript Accessing non existent JavaScript propertiesWhen trying to access a JavaScript object property thathas not been defined yet the value of undefined will be returned by default const classElection date January console log classElection place undefined JavaScript Objects are MutableJavaScript objects are mutable meaning their contents can be changed even when they are declared as const New properties can be added and existing property values can be changed or deleted It is the reference to the object bound to the variable that cannot be changed const student name Sheldon score grade A console log student name Sheldon score grade A delete student score student grade F console log student name Sheldon grade F student TypeError Assignment to constant variable JavaScript Object MethodsJavaScript objects may have property values that are functions These are referred to as object methods Methods may be defined using anonymous functions arrow function expression or with shorthand method syntax Object methods are invoked with the syntax objectName methodName arguments const engine method shorthand with one argument start adverb console log The engine starts up adverb anonymous arrow function expression with no arguments sputter gt console log The engine sputters engine start noisily engine sputter Console output The engine starts up noisily The engine sputters Javascript passing objects as argumentsWhen JavaScript objects are passed as arguments to functions or methods they are passed by reference not by value This means that the object itself not a copy is accessible and mutable can be changed inside that function const origNum const origObj color blue const changeItUp num obj gt num obj color red changeItUp origNum origObj Will output since integers are passed by value console log origNum Will output red since objects are passed by reference and are therefore mutable console log origObj color JavaScript for in loopThe JavaScript for in loop can be used to iterate over the keys of an object In each iteration one of the properties from the object is assigned to the variable of that loop let mobile brand Samsung model Galaxy Note for let key in mobile console log key mobile key Learn more about for in loop this KeywordThe reserved keyword this refers to a method s calling object and it can be used to access properties belonging to that object Here using the this keyword inside the object function to refer to the cat object and access its name property const cat name Goose age whatName return this name console log cat whatName Output GooseWhat is this Javascript function thisEvery JavaScript function or method has a this context For a function defined inside of an object this will refer to that object itself For a function defined outside of an object this will refer to the global object window in browser global in Node js const restaurant numCustomers seatCapacity availableSeats this refers to the restaurant object and it s used to access its properties return this seatCapacity this numCustomers JavaScript Arrow Function this ScopeJavaScript arrow functions do not have their own this context but use the this of the surrounding lexical context Thus they are generally a poor choice for writing object methods Consider the example code loggerA is a property that uses arrow notation to define the function Since data does not exist in the global context accessing this data returns undefined loggerB uses method syntax Since this refers to the enclosing object the value of the data property is accessed as expected returning abc const myObj data abc loggerA gt console log this data loggerB console log this data myObj loggerA undefinedmyObj loggerB abc Javascript getters and setters restrictedJavaScript object properties are not private or protected Since JavaScript objects are passed by reference there is no way to fully prevent incorrect interactions with object properties One way to implement more restricted interactions with object properties is to use getter and setter methods Typically the internal value is stored as a property with an identifier that matches the getter and setter method names but begins with an underscore const myCat name Dottie get name return this name set name newName this name newName Reference invokes the getterconsole log myCat name Assignment invokes the settermyCat name Yankee getters and setters intercept property accessJavaScript getter and setter methods are helpful in part because they offer a way to intercept property access and assignment and allow for additional actions to be performed before these changes go into effect const myCat name Snickers get name return this name set name newName Verify that newName is a non empty string before setting as name property if typeof newName string amp amp newName length gt this name newName else console log ERROR name must be a nonempty string Javascript factory functionsA JavaScript function that returns an object is known as a factory function Factory functions often accept parameters in order to customize the returned object A factory function that accepts name age and breed parameters to return a customized dog object const dogFactory name age breed gt return name name age age breed breed bark console log Woof Lear more about Factory functions JavaScript destructuring assignment shorthand syntaxThe JavaScript destructuring assignment is a shorthand syntax that allows object properties to be extracted into specific variable values It uses a pair of curly braces with property names on the left hand side of an assignment to extract vales from objects The number of variable can be less than the total properties of an object const rubiksCubeFacts possiblePermutations invented largestCube xx const possiblePermutations invented largestCube rubiksCubeFacts console log possiblePermutations console log invented console log largestCube xx shorthand property name syntax for object creationThe shorthand property name syntax in JavaScript allows creating objects without explicitly specifying the property names ie explicitly declaring the value after the key In this process an object is created where the property names of that object match variables which already exist in that context Shorthand property names populate an object with a key matching the identifier and a value matching the identifier s value const activity Surfing const beach activity console log beach activity Surfing ClassesJavaScript supports the concept of classes as a syntax for creating objects Classes specify the shared properties and methods that objects produced from the class will have When an object is created based on the class the new object is referred to as an instance of the class New instances are created using the new keyword The code sample shows a class that represents a Song A new object called mySong is created underneath and the play method on the class is called The result would be the text Song playing printed in the console class Song constructor this title this author play console log Song playing const mySong new Song mySong play More about Classes Class ConstructorClasses can have a constructor method This is a special method that is called when the object is created instantiated Constructor methods are usually used to set initial values for the object class Song play console log Playing stop console log Stopping extendsJavaScript classes support the concept of inheritance ーa child class can extend a parent class This is accomplished by using the extends keyword as part of the class definition Child classes have access to all of the instance properties and methods of the parent class They can add their own properties and methods in addition to those A child class constructor calls the parent class constructor using the super method Parent classclass Media constructor info this publishDate info publishDate this name info name Child classclass Song extends Media constructor songData super songData this artist songData artist const mySong new Song artist Queen name Bohemian Rhapsody publishDate Learn more about extends Static MethodsWithin a JavaScript class the static keyword defines a static method for a class Static methods are not called on individual instances of the class but are called on the class itself Therefore they tend to be general utility methods class Dog constructor name this name name introduce console log This is this name A static method static bark console log Woof const myDog new Dog Buster myDog introduce Calling the static methodDog bark Modules Import Javascript modules with the require functionIn Node js the require function can used to import code from another file into the current script var moduleA require module a js The js extension is optionalvar moduleA require module a Both ways will produce the same result Now the functionality of moduleA can be usedconsole log moduleA someFunctionality Intermediate Javascript Export ModuleTo make an object in our Javascript file exportable as a module in Node js we assign the object to the exports property of module let Course Course name Javascript Node js module exports Course Javascript export defaultAs of ES the export default keywords allow for a single variable or function to be exported then in another script it will be straightforward to import the default export After using the export default it is possible to import a variable or function without using the require function module moduleA js export default function cube x return x x x In main jsimport cube from moduleA js Now the cube function can be usedstraightforwardly console log cube Learn more about javascript export Using the import keyword in JavascriptAs of ES the import keyword can be used to importfunctions objects or primitives previously exported intothe current script There are many ways to use the import keyword forexample you can import all the exports from a script byusing the selector as follows import from module name A single function can be imported with curly brackets asfollows import funcA as name from module name Or many functions by name import funcA funcB as name from module name Learn more about import Promises JavaScript Promise ObjectA JavaScript Promise is an object that can be used toget the outcome of an asynchronous operation when thatresult is not instantly available Since JavaScript code runs in a non blocking manner promises become essential when we have to wait forsome asynchronous operation without holding back theexecution of the rest of the code More about Promises States of a JavaScript PromiseA JavaScript Promise object can be in one of three states pending resolved or rejected While the value is not yet available the Promise stays in the pending state Afterwards it transitions to one of the two states resolved or rejected A resolved promise stands for a successful completion Due to errors the promise may go in the rejected state In the given code block if the Promise is on resolved state the first parameter holding a callback function of the then method will print the resolved value Otherwise an alert will be shown const promise new Promise resolve reject gt const res true An asynchronous operation if res resolve Resolved else reject Error Error promise then res gt console log res err gt alert err Creating a Javascript Promise objectAn instance of a JavaScript Promise object is created using the new keyword The constructor of the Promise object takes a function known as the executor function as the argument This function is responsible for resolving or rejecting the promise const executorFn resolve reject gt console log The executor function of the promise const promise new Promise executorFn Executor function of JavaScript Promise objectA JavaScript promise s executor function takes two functions as its arguments The first parameter represents the function that should be called to resolve the promise and the other one is used when the promise should be rejected A Promise object may use any oe or both of them inside its executor function In the given example the promise is always resolved unconditionally by the resolve function The rejected function could be used for a rejection const executorFn resolve reject gt resolve Resolved const promise new Promise executorFn setTimeout setTimeout is an asynchronous JavaScript function that executes a code block or evaluates an expression through a callback function after a delay set in milliseconds const loginAlert gt alert Login setTimeout loginAlert Learn more about setTimeout then method of a JavaScript Promise objectThe then method of a JavaScript Promise object can be used to get the eventual result or error of the asynchronous operation then accepts two function arguments The first handler supplied to it will be called if the promise is resolved The second one will be called if the promise is rejected const promise new Promise resolve reject gt setTimeout gt resolve Result promise then res gt console log res err gt alert err More about then Chaining multiple then methodsThe then method returns a Promise even if one or both of the handler functions are absent Because of this multiple then methods can be chained together This is known as composition In the code block a couple of then methods are chained together Each method deals with the resolved value of their respective promises const promise new Promise resolve gt setTimeout gt resolve dAlan promise then res gt return res Alan Promise resolve Hey Alan Promise reject Who are you then res gt console log res err gt alert err The catch method for handling rejectionThe function passed as the second argument to a then method of a promise object is used when the promise is rejected An alternative to this approach is to use the JavaScript catch method of the promise object The information for the rejection is available to the handler supplied in the catch method const promise new Promise resolve reject gt setTimeout gt reject Error Promise Rejected Unconditionally promise then res gt console log value promise catch err gt alert err Learn more about catch Avoiding nested Promise and then In JavaScript when performing multiple asynchronous operations in a sequence promises should be composed by chaining multiple then methods This is better practice than nesting Chaining helps streamline the development process because it makes the code more readable and easier to debug const promise new Promise resolve reject gt setTimeout gt resolve const twoStars star gt return star star const oneDot star gt return star const print val gt console log val Chaining them all togetherpromise then twoStars then oneDot then print JavaScript Promise all The JavaScript Promise all method can be used to execute multiple promises in parallel The function accepts an array of promises as an argument If all of the promises in the argument are resolved the promise returned from Promise all will resolve to an array containing the resolved values of all the promises in the order of the initial array Any rejection from the list of promises will cause the greater promise to be rejected In the code block and will be printed respectively even though promise will be resolved after promise const promise new Promise resolve reject gt setTimeout gt resolve const promise new Promise resolve reject gt setTimeout gt resolve Promise all promise promise then res gt console log res console log res More about Promise all Async AwaitThe async await syntax in ES offers a new way write more readable and scalable code to handle promises It uses he same features that were already built into JavaScript function helloWorld return new Promise resolve gt setTimeout gt resolve Hello World async function msg const msg await helloWorld console log Message msg msg Message Hello World lt after secondsLearn more about Async await Asynchronous JavaScript functionAn asynchronous JavaScript function can be created with the async keyword before the function name or before when using the async arrow function An async function always returns a promise function helloWorld return new Promise resolve gt setTimeout gt resolve Hello World const msg async function Async Function Expression const msg await helloWorld console log Message msg const msg async gt Async Arrow Function const msg await helloWorld console log Message msg msg Message Hello World lt after secondsmsg Message Hello World lt after seconds JavaScript async await operatorThe JavaScript async await syntax in ES offers a new way write more readable and scalable code to handle promise A JavaScript async function can contain statements preceded by an await operator The operand of await is a promise At an await expression the execution of the async function is pause and waits for the operand promise to resolve The await operator returns the promise s resolved value An await operand can only be used inside an async function function helloWorld return new Promise resolve gt setTimeout gt resolve Hello World async function msg const msg await helloWorld console log Message msg msg Message Hello World lt after seconds Learn about async await JavaScript async…await advantageThe JavaScript async await syntax allows multiple promises to be initiated and then resolved for values when required during execution of the program As an alternate to chaining then functions it offers better maintainability of the code and a close resemblance synchronous code Async Function Error HandlingJavaScript async functions uses try catch statements for error handling This method allows shared error handling for synchronous and asynchronous code let json age incomplete datatry let user JSON parse json lt no errors alert user name no name catch e alert Invalid JSON data Using async await syntaxConstructing one or more promises or calls without await can allow multiple async functions to execute simultaneously Through this approach a program can take advantage of concurrency and asynchronous actions can be initiated within an async function Since using the await keyword halts the execution of an async function each async function can be awaited once its value is required by program logic Resolving JavaScript PromisesWhen using JavaScript async await multiple asynchronous operations can run concurrently If the resolved value is required for each promise initiated Promise all can be used to retrieve the resolved value avoiding unnecessary blocking let promise Promise resolve let promise let promise new Promise function resolve reject setTimeout resolve foo Promise all promise promise promise then function values console log values expected output Array foo Requests Asynchronous calls with XMLHttpRequestAJAX enables HTTP requests to be made not only during the load time of a web page but also anytime after a page initially loads This allows adding dynamic behavior to a webpage This is essential for giving a good user experience without reloading the webpage for transferring data to and from the web server The XMLHttpRequest XHR web API provides the ability to make the actual asynchronous request and uses AJAX to handle the data from the request The given code block is a basic example of how an HTTP GET request is made to the specified URL const xhr new XMLHttpRequest xhr open GET mysite com api getjson Learn more about XMLHttpRequest HTTP POST requestHTTP POST requests are made with the intention of sending new information to the source server that will receive it For a POST request the new information is stored in the body of the request Learn more about POST HTTP GET requestHTTP GET requests are made with the intention of retrieving information or data from a source server over the web GET requests have no body so the information that the source requires in order to return the proper response must be included in the request URL path or query string Learn more about GET The query string in a URLQuery strings are used to send additional information to the server during an HTTP GET request The query string is separated from the original URL using the question mark character In a query string there can be one or more key value pairs joined by the equal character For separating multiple key value pairs an ampersand character amp is used Query strings should be url encoded in case of the presence of URL unsafe characters const requestUrl id JSON JavaScript Object NotationJSON or JavaScript Object Notation is a data format suitable for transporting data to and from a server It is essentially a slightly stricter version of a Javascript object A JSON object should be enclosed in curly braces and may contain one or more property value pairs JSON names require double quotes while standard Javascript objects do not const jsonObj name Rick id A level XMLHttpRequest GET Request RequirementsThe request type response type request URL and handler for the response data must be provided in order to make an HTTP GET request with the JavaScript XMLHttpRequest API The URL may contain additional data in the query string For an HTTP GET request the request type must be GET const req new XMLHttpRequest req responseType json req open GET myendpoint getdata id req onload gt console log xhr response req send HTTP POST request with the XMLHttpRequest APITo make an HTTP POST request with the JavaScript XMLHttpRequest API a request type response type request URL request body and handler for the response data must be provided The request body is essential because the information sent via the POST method is not visible in the URL The request type must be POST for this case The response type can be a variety of types including array buffer json etc const data fish Salmon weight KG units const xhr new XMLHttpRequest xhr open POST inventory add xhr responseType json xhr send JSON stringify data xhr onload gt console log xhr response fetch methodA JavaScript Fetch API is used to access and manipulate requests and responses within the HTTP pipeline fetching resources asynchronously across a network A basic fetch request will accept a URL parameter send a request and contain a success and failure promise handler function In the example the block of code begins by calling the fetch function Then a then method is chained to the end of the fetch It ends with the response callback to handle success and the rejection callback to handle failure fetch url then response gt console log response rejection gt console error rejection message Learn more about fetch Response ok property fetch apiIn a Fetch API function fetch the ok property of a response checks to see if it evaluates to true or false In the code example the ok property will be true when the HTTP request is successful The ok property will be false when the HTTP request is unsuccessful fetch url method POST headers Content type application json api key apiKey body data then response gt if response ok return response json throw new Error Request failed networkError gt console log networkError message Learn more about Response ok Fetch API FunctionThe Fetch API function fetch can be used to create requests Though accepting additional arguments the request can be customized This can be used to change the request type headers specify a request body and much more as shown in the example block of code fetch method POST body JSON stringify id then response gt if response ok return response json throw new Error Request failed networkError gt console log networkError message then jsonResponse gt console log jsonResponse Learn more about fetch JSON Formatted response bodyThe json method will resolve a returned promise to a JSON object parsing the body text as JSON The example block of code shows json method that returns a promise that resolves to a JSON formatted response body as a JavaScript object fetch url that returns JSON then response gt response json then jsonResponse gt console log jsonResponse fetch with Async AwaitThe async…await syntax is used with the JS Fetch API fetch to work with promises In the code block example we see the keyword async placed the function This means that the function will return a promise The keyword await makes the JavaScript wait until the problem is resolved const getSuggestions async gt const wordQuery inputField value const endpoint url queryParams wordQuery try const response await fetch endpoint cache no cache if response ok const jsonResponse await response json catch error console log error ConclusionIf you enjoyed this article then don t forget to press ️ If you have any queries or suggestions don t hesitate to drop them It is very long and I know I haven t cover everything in this such as DOM manipulation that can be explained in the separate article SAVE FOR LATER USE See you You can extend your support by buying me a Coffee You might be interested in Image Slider with Vanila JSHow to use Web Storage API CSS Resources that you should bookmark	2022-02-01 18:16:10
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