投稿時間:2021-08-02 16:41:01 RSSフィード2021-08-02 16:00 分まとめ(50件)

カテゴリー等	サイト名等	記事タイトル・トレンドワード等	リンクURL	頻出ワード・要約等/検索ボリューム	登録日
IT	InfoQ	Amazon CodeGuru ReviewerがGitHub ActionsとのCI/CD統合を発表	https://www.infoq.com/jp/news/2021/08/codeguru-github-actions/?utm_campaign=infoq_content&utm_source=infoq&utm_medium=feed&utm_term=global	AmazonCodeGuruReviewerがGitHubActionsとのCICD統合を発表Amazonは先頃、AmazonCodeGuruReviewerとGitHubActionsのCICD統合を発表した。	2021-08-02 06:05:00
IT	InfoQ	Androidアプリで間もなく、Android App Bundelsの採用が必須に	https://www.infoq.com/jp/news/2021/08/android-app-bundle-required/?utm_campaign=infoq_content&utm_source=infoq&utm_medium=feed&utm_term=global	etranslatedbyhyoshida	2021-08-02 06:01:00
TECH	Engadget Japanese	ヤフーメールAndroid版、Gmailの送受信が可能に	https://japanese.engadget.com/android-yahoomail-063101867.html	gmail	2021-08-02 06:31:01
TECH	Engadget Japanese	スマホ・PCに接続してVRでゲーム内をサイクリングできる「Blync」	https://japanese.engadget.com/blync-061547316.html	blync	2021-08-02 06:15:47
TECH	Engadget Japanese	Zoom、プライバシー侵害や荒らし放置の集団訴訟で93億円の支払いに合意	https://japanese.engadget.com/zoom-reaches-85-million-settlement-privacy-060037198.html	集団訴訟	2021-08-02 06:00:37
IT	ITmedia 総合記事一覧	[ITmedia News] 港区のセゾンカード会員はフードデリバリーに月12万円　クレディセゾン調査	https://www.itmedia.co.jp/news/articles/2108/02/news110.html	itmedia	2021-08-02 15:52:00
IT	ITmedia 総合記事一覧	[ITmedia PC USER] エレコム、アナログ接続イヤフォンをUSB経由で使える変換アダプター	https://www.itmedia.co.jp/pcuser/articles/2108/02/news107.html	itmediapcuser	2021-08-02 15:17:00
IT	ITmedia 総合記事一覧	[ITmedia Mobile] コード決済の満足度はPayPay、利用頻度は楽天ペイがトップ　MMDの調査より	https://www.itmedia.co.jp/mobile/articles/2108/02/news097.html	paypay	2021-08-02 15:15:00
IT	ITmedia 総合記事一覧	[ITmedia News] LINEに“いいね”風の新機能　スマホアプリ版に「リアクション」追加	https://www.itmedia.co.jp/news/articles/2108/02/news106.html	itmedianewsline	2021-08-02 15:01:00
python	Pythonタグが付けられた新着投稿 - Qiita	Linux（Mint）でのOpenCVセットアップ	https://qiita.com/noto_vt/items/89730eef4c6348f7747d	OpenCVのインストールここでは先程インストールしたpipを用いてOpenCVをインストールを行います。	2021-08-02 15:35:38
python	Pythonタグが付けられた新着投稿 - Qiita	Databrick REST APIによりDatabricksトークンを作成後にシークレットとして登録する方法	https://qiita.com/manabian/items/36b54561e2b265de4251	実行環境databricksruntimexcpumlscalaPythonversionpysparkversiondev手順Databricksトークンを手動で作成して変数にセットUserSettingsにてtmpというコメントをつけたトークンを作成。	2021-08-02 15:35:28
python	Pythonタグが付けられた新着投稿 - Qiita	カーネル密度推定（KDE: Kernel Density Estimation）をpython (numpy)で実装・整理してみる	https://qiita.com/shokishimada/items/f630a20099e8e4bdc2f7	KDEのパラメータバンド幅・カーネル関数バンド幅についてKDEではカーネル関数の変数へはある点xと、i番目のサンプル点xiの差をバンド幅hで割ったものが代入されています。	2021-08-02 15:20:21
js	JavaScriptタグが付けられた新着投稿 - Qiita	Chrome92からalert,confirmの動作の仕様変更でGASのWEBアプリで困った件	https://qiita.com/basictomonokai/items/928ca76bd1f985dd067d	安定稼働放置していたGASのWebアプリがある日動かないと言われた長編ポエム分かりやすく書いてくれていてありがたかったのですが、confirmで処理を分けていたのをやめる、alertをコメントアウトするという、一時的な回避策の記事になっていました。	2021-08-02 15:02:06
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	web.xmlの内部エラーについて	https://teratail.com/questions/352399?rss=all	webxmlのに原因不明のエラーが発生し、対処に困っている。	2021-08-02 15:50:44
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	複合ユニークキー制約で、データを更新するときの重複エラーを解決したい	https://teratail.com/questions/352398?rss=all	複合ユニークキー制約で、データを更新するときの重複エラーを解決したい複合ユニークキーでテーブルを作成し、データを更新しようとしたら重複エラーが発生したので解決したい。	2021-08-02 15:46:14
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	VBAのテキストボックスに行番号を表示する。	https://teratail.com/questions/352397?rss=all	表示	2021-08-02 15:42:16
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	GASを使い問合せメールをスプレッドシートに反映	https://teratail.com/questions/352396?rss=all	GASを使い問合せメールをスプレッドシートに反映前提・実現したいこと営業をやっています。	2021-08-02 15:29:58
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	Javaで指定のキーを押すと、効果音が鳴るjavaプログラム	https://teratail.com/questions/352395?rss=all	Javaで指定のキーを押すと、効果音が鳴るjavaプログラム前提・実現したいことここに質問の内容を詳しく書いてください。	2021-08-02 15:21:38
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	Java-SpringSecurityにて独自の二段階認証を行いたい	https://teratail.com/questions/352394?rss=all	JavaSpringSecurityにて独自の二段階認証を行いたい前提として、一段階目の認証はSpringSecurityを利用したパスワード認証を行います。	2021-08-02 15:21:13
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	Androidのプッシュ通知でバックグラウンドでもアクティビティを起動したい	https://teratail.com/questions/352393?rss=all	Androidのプッシュ通知でバックグラウンドでもアクティビティを起動したいAndroidのプッシュ通知で通知エリアをタップした際、特定のアクティビティを起動したいのですが、バックグラウンドではこれがうまく機能しません。	2021-08-02 15:20:24
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	Access　データを入力して登録ボタンを押すと　access9 3043 ネットワークへのアクセスが中断されました。。。と出ます。	https://teratail.com/questions/352392?rss=all	】と表示されます。	2021-08-02 15:09:10
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	Unityで作ったゲームをWebGLでビルドしたいがエラーが出る	https://teratail.com/questions/352391?rss=all	Unityで作ったゲームをWebGLでビルドしたいがエラーが出る前提・実現したいことUnity初心者ですUnityで作ったゲームをWebGLにビルドしようとしたときに下のようなつのエラーが出ました。	2021-08-02 15:02:17
Linux	Ubuntuタグが付けられた新着投稿 - Qiita	Gtk3アプリ iniファイルの操作	https://qiita.com/iota_11/items/d7070ea1b9d2e9ce3d50		2021-08-02 15:17:46
AWS	AWSタグが付けられた新着投稿 - Qiita	Amazon EC2を利用した仮想サーバー構築方法③(Apacheのインストールとファイアウォールの設定)	https://qiita.com/iiiiiiiiih/items/f3e9db96687b1ad81baa	このコマンドを実行して、以下のような実行結果が表示されれば、サーバー上でApacheが起動しています。	2021-08-02 15:56:26
技術ブログ	Developers.IO	AWS AmplifyでNext.jsのISRを試してみる	https://dev.classmethod.jp/articles/amplify-next-js-isr/	enderedappswithamplifyaw	2021-08-02 06:32:08
技術ブログ	Developers.IO	Agile Tech EXPOでシルバースポンサーしてきました。初めてのオンラインブーススタッフもしてきました。	https://dev.classmethod.jp/articles/agile-tech-expo-2021-silversponsor/	agiletechexpo	2021-08-02 06:08:04
海外TECH	DEV Community	What is D3.js ?	https://dev.to/mayank0508/what-is-d3-js-4pim	What is D js As a developers I really love data and that too in a arranged manner Sometimes Data can be such a mess that it becomes more of a headache that a resource with data we can solve so many problem in our day to day life D js can help us hereD js is a JavaScript library for manipulating documents based on data D helps you bring data to life using HTML SVG and CSS D s emphasis on web standards gives you the full capabilities of modern browsers without tying yourself to a proprietary framework combining powerful visualization components and a data driven approach to DOM manipulation D stands for Data Driven DocumentsThe full form explains itself its is a library which helps us in making graphs charts projections form just a set of data Installation lt script src gt lt script gt Now lets get into some coding examples d selectAll this is used to select all the elements given inside the parenthesisd select this is used to select just a particular element inside the parenthesis d select h style color red this takes the h tag from the html and converts it into red color text hi there this changes the text in the html to the given stringd select body append p text YOLO this appends the text to the p tag in the bodyd select body append p text YOLO d select body append p text YOLO d select body append p text YOLO d selectAll p style color blue this snippet is used to select all the p tags and change their color to blueThese are the basics way we can manipulate the Data inside the JS using the D js libraryTo get more depth knowledge on this topic go and check this video form FreeCodeCamp org on their YouTube channel Meme Section Happy Coding ‍	2021-08-02 06:41:26
海外TECH	DEV Community	The (Most Comprehensive) JavaScript Design Principles Guide	https://dev.to/cleancodestudio/the-most-comprehensive-javascript-design-principles-guide-7i3	The Most Comprehensive JavaScript Design Principles Guide ltag user id follow action button background color d important color ffffff important border color d important Clean Code StudioFollow Clean Code Clean Life Simplify As JavaScript developers we strive towards clean healthy and maintainable code We strive towards solving challenges eloquently While these challenges may each within themselves be unique we don t necessarily require unique solutions for each individual one of these new challenges we face If you ve used a solution that is not a unique solution to solve a challenge that is in of itself a unique challenge then you have utilized the power of a JavaScript design pattern Software languages have been around for decades The life span of a software language is decently well understood at this point During any language s lifespan many such reusable solutions are made and tested by a large number of the developers within a given languages community Through the power of compounded developer experience solutions known as design patterns are created and made useful to the masses These solutions support the creation of optimized ways to solve a large many of problem types based on a much lesser amount of design patterns Design patterns are reusable solutions to commonly occurring problems in software design What benefits do we gain from design patterns Proven Solutions Many software developers use Design Patterns Being used by many developers with success we are provided with more certainty of our success when implementing a given design pattern When a design pattern becomes main stream you can have confidence in knowing that they have been revised and refactored multiple times over Proven solutions are often times optimal consider edge cases and are utilized in a wide variety of use cases Easily Reusable When a solution is reusable it can be modified to solve multiple particular problems Design patterns document a reusable solution that is not coupled to any specific problem but rather a set of challenges that the design pattern assists in over coming Expressive Often times design patterns can explain large solutions in a to the point and simplified way Lower the need for refactoring code Most design patterns take into account code dependencies existing and future dependencies The Open Closed Design Principle for example prevents the need to refactor code that is already written Instead you create a new class implement an interface in other non js languages and add code You limit the need to refactor code using design patterns Simplify Communication Teams built with software engineers who are familiar with design patterns are able to more easily communicate internally through the language of their code base They are also able to communicate externally about potential solutions future concerns worth noting and over all architectural design Design Patterns simplify communication Reduced Codebase site Due to their elegant efficient and well thought out approach design patterns usually require less code and ultimately simply a team s code base Before we dive in let s breifly review the history of JavaScript to better understand the context in which many of our modern day design patterns were built A Brief JavaScript History LessonIn the world of web development JavaScript is one of the most popular programming languages out there today In the beginning JavaScript wasn t intended to be this impressive world wide accepted language with reactive front ends modularized code repositories and millions of packages installable via npm Not even close in the beginning JavaScript was more like the glue that allowed you to stick various displays of HTML elements together First known as a client side scripting language one of the worlds first web browsers Netscape Navigator utilized JavaScript display static HTML This of course led to what we now know as war of the browsers Browser s were new hot and exploding they were that next big thing in the tech industry Big players like Mozilla Formerly known as Netscape Communications Microsoft Explorer and eventually Chrome battled it out for Browser glory As the driving force behind each Browser in this Browsers War the big dogs were researching developing and creating new and improved ways to implement their own client side scripting language Netscape JavaScript Really Brendan Eich created the original JS Microsoft JScript Any one know what that is anymore As a developer in that day in age I image great frustrations The implementations differed in great regards Development wasn t for all browsers but instead for individual browsers As I imagine it a heard of angry software engineers with pitch forks and torches gathered in numbers that rivaled the armies of our world histories most malicious wars With out raged developers rising we have one single demand pick a MO FU language for all browsers My imagination visualizes our developer ancestors during this era more as great viking warriors thirsty for war and to face death in the battle for simplification and glory I ve also been watching Vikings lately on Hulu this may have my imagination running rampant Thus ECMAScript was born What was ECMAScript you ask The cry of freedom inclusivity and standardization of non insanity ECMAScript is a standardized scripting language specification which all modern browsers try to support It does have many implementations that are more like differing dialects if you want to make the traditional human language analogy I like to think of ECMAScript as the original father of all scripting languages and JavaScript as it s heroic son the hero of hero s the fighter who beat all odds and the one who lands all of the senorita s because it s awesome But like seriously JavaScript is one of the languages most often used software languages by all of you senorita engineers JavaScript was the most popular dialect that arose from ECMAScript Since it s big bang into the world of reality ECMAScript has done some important things for the software engineering community It has standardized a lot of important things that is listed here on Wikipedia Browser support for ECMAScript versions ES and higher are still incomplete and have to be transpiled to ES in order to be fully supported What is JavaScript Other than Awesome Lets introduce some very important JavaScript language characteristics You ll want some awareness and context around these attributes of JavaScript before diving into the JS Design Patterns talked about in this article Hey you Reading this article Here s a question for you What is JavaScript One possible answer might be JavaScript is a lightweight interpreted object oriented programming language with first class functions most commonly known as a scripting language for web pages Hmmm Huhhh Basically what this very overy complicated quote written by a person or persons much smarter than me meant to say is something like JS has a low memory footprintJS is easy to implementJS is easy to learnJS has syntax similar to that of other popular languages such as C and JavaJS is a scripting languageWhich means its code is interpreted instead of compiledJS has procedural supportJS has object oriented supportJS has functional programming styles supportJS is flexible for developers Until S breaks then it just hurts These would be the JavaScript attributes or characteristics that you will find in many other popular software languages but as many of us know all to well JavaScript is funky and goes to the beat of its own groove JavaScript Supports First Class FunctionsFirst class functions are incredibly powerful but also somewhat difficult to grasp at first A programming language is said to have First class functions simply means that functions in that language are treated like any other variable First Class Functions Can Be Passed As Arguments to other functions We pass a function as the argument function action name payload callback function let context name payload callback function context action log alert hello world function context console log The action context context The action name context name The action payload context payload First Class Functions Can Be Returned by another functionfunction sayHello return function console log Hello First Class Functions Can Be Assigned as a value to a variableconst foo function console log foobar Invoke it using the variablefoo JavaScript Prototype BasedJavaScript is object oriented thus it supports objects Now most non familiar with JavaScript would logically think objects then classes and then maybe even inheritance JavaScript has a bit of a different approach Classes aren t supported in the plain form of JavaScript instead JavaScript uses what is known as Prototype Based or Instance Based InheritanceIn ES the term of Class was formally introduced All browsers do fully support ES as this post is being written so we can use the Class keyword but it still works differently in a prototypal language like JS Prototype based programming Style of object oriented programmingBehavior reuse known as inheritance is performed via a process of reusing existing objects via delegations that serve as prototypesWe dive deeper further down in the design patterns section of this article Understanding prototypes is extremely important JS but let s hold off on adding in too much detail just yet JavaScript Event LoopsHave you ever heard of a callback function If you re used to working in the world of JavaScript I m sure you have A callback function is a function sent as a parameter acceptable thanks to functions being first class citizens to another function The function passed as a parameter is then called after an event fires Often times this is used for subscribing to events Example Right mouse click event triggers a function to be called hence callback functionAn event has a listener attached to it Each time that event fires otherwise the event is lost A message is sent to a queue of messages This queue FIFO first in first out of message processes synchronously This process is what we know as the JavaScript event loop Each queue message Has an associated functionOnce the queue message is dequeued The runtime executes the function completely before processing any other message If a function contains other function callsThey are all performed prior to processing a new message from the queue This is called run to completionwhile queue waitForMessage queue processNextMessage queue waitForMessage Synchronously waits for new messages Each of the messages being processed has its own stackAnd is processed until the stack is empty Once finished processingA new message is processed from the queue if there is one Have you ever heard the terminology of non blocking or asynchronous used in reference to JavaScript When an async operation is executedIt does not halt or stop the the runtimeThe program is able to process other thingsEx Receiving user inputWhile waiting for the asynchronous operation to finalizeAsynchronous operations are non blocking to the main execution thread This is an extremely useful ability both wielded internally by JavaScript while also usable externally for your specific JavaScript use cases Async vs Sync is a huge topic in JavaScript but if we too dive deep into we d never get to our design patterns the topic in scope for this post What are design patternsDesign patterns are reusable solutions to commonly occurring problems in software design Let s take a look at some of the categories of design patterns Proto patternsCreating a design pattern how do you do it Do you notice any commonly re occurring problem Have you surmounted a solution you ve uniquely designed to solve this problem This solution of yours let s say it s not globally recognized and documented Every time this problem comes up or is encountered you use this solution This solution you ve created is reusable and the developer community as a whole would be beneficiaries of such a pattern This would not immediately make it a design pattern A programmer may have good code and simply mistake something that looks like a pattern for an actual design pattern when at the end of the day it s not an actual design pattern What makes something an actual design pattern Answer General developer consensus If you re able to get opinions from a large number of developers you re on the right track By knowing the process of creating a pattern itself and by making yourself well acquainted with existing patterns you re beginning to learn that process Any design pattern must go through this phase for it to become a full fledged pattern This is called a proto pattern A proto pattern is a pattern to be if it meets the standards defined by a certain period of testing that it must undergo by a various number of developers It must be tested within the context of many challenges be analyzed within a number of scenarios and ultimately the be proven a useful and re usable design pattern via many tests and general community consensus A large amount of work amp documentation has been done in order to show what it takes to make a fully fledged pattern recognized by the developer community of a given software language Anti patternsAlso worth noting like with many things in software is the inverse of a given concept What s the inverse of a design pattern Anti patternsAn Anti pattern is representative of a bad practice An example of an anti pattern would be modifying the Object class prototype In JavaScript everything pretty much inherits from Object JavaScript uses prototype based inheritance so given any situation you have now changed a something You ve created a variation that could alter all other design patterns concepts or techniques within JavaScript This is no good and thus an anti design pattern Design Pattern CategorizationCategorization of design patterns happens in a multitude of ways but here s a popular breakdown Creational design patternsStructural design patternsBehavioral design patternsConcurrency design patternsArchitectural design patterns Creational Design PatternsCreational design patterns are patterns used to create objects These are design patterns that optimize the mechanisms which create a single or group of objects Builder Design PatternFactory Design PatternSingleton Design PatternPrototype Design PatternAbstract Factory Design PatternAre all examples of Creational Design Patterns Structural Design PatternsStructural design patterns are related to object relationships These kinds of design patterns ensure that if one part of a system changes the entire system doesn t need to change along with it Proxy Design PatternBridge Design PatternFacade Design PatternAdapter Design PatternDecorator Design PatternFlyweight Design PatternComposite Design PatternAre all examples of Structural Design Patterns Behavioral Design PatternsBehavioral design patterns recognize implement and improve communication between contrasting objects in a system They are used to support contrasting parts of a given software system have synchronized data State Design PatternVisitor Design PatternCommand Design PatternMemento Design PatternIterator Design PatternMediator Design PatternObserver Design PatternStrategy Design PatternChain of Responsibility Design PatternAre all examples of Behavioral Design Patterns Concurrency Design PatternsConcurrency design patterns are utilized to implement solutions for multi threaded programming paradigms Scheduler Design PatternActive Object Design PatternNuclear Reaction Design PatternAre all examples of Concurrency Design Patterns Architectural Design PatternsArchitectural design patterns are utilized to implement architectural best practices MVP Design Pattern Model view presenter MVC Design Pattern Model view controller MVVM Design Pattern Model View ViewModel Are all examples of Architectural Design Patterns Design Pattern ExamplesA design pattern each one is representative of a specific type of solution to a specific type of problem The best design pattern is never universal In order to become the best software engineers we can become we need to to learn when a given design pattern should be used We need to learn which design pattern is best from a contextual vantage point Utilizing a design pattern for a given problem that is not the proper design pattern could not only not be helpful but could lead to hurting us and our application goals Constructor PatternIn classical object oriented software languages the constructor is one of the first special functions we learn about It s the function we use to initialize an object with some set of default property values How do we create an object in JavaScript what are some of the most common ways let obj let obj Object create Object prototype let obj new Object Once we ve created our object there are four ways since ES to actually go about adding properties to our newly created js object Dot Notationobj key value Bracket Notationobj key value Object definePropeties notationObject defineProperties obj keyOne value one writable true keyTwo value two writable false The curly brackets notation is the most popular way to create objects in JavaScript The dot notation or square brackets is the most popular way to define properties and set values for those properties As we talked about earlier JS does not actually support traditional object oriented classes However we do have the new keyword in JavaScript We are able to support constructors in javascript via the new keyword We can use a function as a constructor ultimately initializing an object with properties and passing in values for that objects initial property values using new function Person name email admin this name name this email email this admin admin this isAdmin gt this admin true this isNotAdmin gt this admin false let tim new Person Tim tim gmail com false let sarah new Person Sarah sarah gmail com true tim isAdmin falsetim isNotAdmin truesarah isAdmin truesarah isNotAdmin falseAre we able to improve this syntax Do we really want to define the functions that an object will have within its constructor We can also tap into the objects prototype to add methods onto the object Check out this syntax function Person name email admin this name name this email email this admin admin Person prototype isAdmin function return this admin true Person prototype isNotAdmin function return this admin false let tim new Person Tim tim gmail com false let sarah new Person Sarah sarah gmail com true tim isAdmin falsetim isNotAdmin truesarah isAdmin truesarah isNotAdmin false Module Design PatternJavaScript never ceases to amaze when it comes to peculiar things it is capable of achieving Yes sometimes these peculiarities are confusing however this is also comes with the ability to implement some pretty dang powerful patterns One of these weird things JavaScript is capable of compared to other languages is its ability to support access to modifiers Before we dive into the module pattern let s first dive into closure s within JavaScript Understanding a closure is pivotal to really understanding some of the most powerful patterns available to us within JavaScript JavaScript ClosuresA closure is a function with access to the parent scope even after the parent function has closed Closures assist us in mimicking the behavior of access modifiers through scoping Let s learn via an example let Countable function let count return function return count console log Countable console log Countable console log Countable In this example we re using IIFE aka an Immediately invoked function expression Every time we call countable the function it is tied to immediately executes We re able to do this thanks to the power of functions being first class citizens in JS When this function is called we actually return another nested function Since we are not able to access the count variable from outside of Countable we have through the power of a design pattern made it a private member of the Countable object count is private Via the power of closures we re able to create objects with private and public parts These are called modules and are extremely useful whenever we need the ability to hide the behavior of certain sub parts of an object We re able to modify which behaviors are publicly exposed and which parts are private and NOT publicly exposed Here s another example const Collection function items is a private property let items everything returned engulfed public properties and methods return add function item items push item remove function item let index items indexOf item if index gt items splice index all function return JSON parse JSON stringify items Collection add Tim Collection add Sarah Collection add Raphael console log Collection all Tim Sarah Raphael Collection remove Sarah console log Collection all Tim Raphael This pattern allows us to introduce a clear partition between private and public parts of an object This concept is familiar to developers who have that classical object oriented background experience That being said this doesn t make everything as perfectly complete as we d like What if you want to change the visibility of a member You d be required to change the code modifying it in all places where you ve used that member because of the weird or different set up we need to setup in order to implement the module design patternChanging a private part to a public part or vice versa requires you to change several internal dependency points within your code Revealing Module Design PatternLet s improve the module design pattern we illustrated above Our main differential is that we re going to write the entire object logic within the private scope of the module and then expose parts in which we want exposed as public by returning an anonymous object We can also change the naming of private members when mapping private members to their corresponding public members const Collection function Private Members let items function all return JSON parse JSON stringify items function add item items push item function remove item let index items indexOf item if index gt items splice index Public Members return addItem add allItems all removeItem remove Collection addItem Tim Collection addItem Sam Collection addItem Ben console log Collection allItems Tim Sam Ben Collection remove Sam console log Collection allItems Tim Ben This example shown directly above is what s known as the revealing module pattern It is one of at least differing ways in which we re able to implement the module pattern What s the difference between the revealing module pattern and all of the other variations of the module design pattern The differences are primarily based on how public members are referenced As the outcome the revealing module design pattern is much easier to use and modify With that being said this design pattern may be fragile in certain contexts remember that no single design pattern is universally the best fit Here s a couple of problematic situations to consider when asking whether you should utilize the Revealing module pattern A private function is referring to a public function In this scenario we cannot override the public function using this design pattern When we attempt to override it we ll introduce a bug to our software due to the private function continuing to refer to the private implementation of the function We shouldn t use this design pattern if we have a public member pointing to a private variable and then proceed to try to override the public member from outside the module In this scenario the other functions would still refer to the private value of the variable introducing a bug into our software Singleton Design PatternThe singleton design pattern is used in situations where we need exactly one instance of a class The Singleton design pattern is in the creation design pattern category Imagine for example we need to have an object which contains some configuration settings for our applications defined before our runtime even begins In these scenario is is not necessary to create a whole new object every time we need this configuration object The configuration settings defined by the user need to be loaded into an object one time so our JS runtime can access the config settings but we don t need to re create this object every single time we try to access the config settings const Singleton function Private config let config function initializedConfigurationSettings values this random Mathod random values values this number values number this size values size return getConfig function values we initialize the singleton value only once if config undefined config new initializedConfigurationSettings values return config const ConfigurationSettings singleton getConfig app HelloWorld environment local console log ConfigurationSettings app HelloWorld environment local ConfigurationSettings getConfig number same randomDecimalValue as in the first config aka we ve proven it s the same objectIn this example you can see that we generate a random number If you were to use this code that randomly generated number would be the same after the first call to singleton getConfig This is our way of proving that the singleton object returns the same object each time We only create the object one time and then return the same configuration object each time after that Observer Design PatternThe observer design pattern is in my opinion one of the most powerful design patterns out there especially within JavaScript The observer design pattern is a Behavioral Design Pattern We can this design pattern to improve the communication between contrasting parts of a software application This design pattern does have several variants when it comes to its implementation but its most basic form has tow main parts Part One SubjectPart Two ObserversA subject is responsible for handling all of the operations regarding a certain topic Observers subscribe to this subject An observer can subscribe and unsubscribe from a topic Imagine that we have two types of objects A customer A store The customer is interested in a particular brand of product Ex iPhone which should become available in the store very soon Having the customer visit the store every day and check product availability is resource intensive Instead the customer can subscribe to the iPhone topic provided by the store Solution The object that has some sort of interesting state is the subject Since it is also going to notify other object about the changes to its state we ll also call it the publisher All other objects in our case customers are going to be the subscribers let publisher function container represents a unique subscription id to a topic let id container subscribe function topic callback if topic in container container topic container topic push id id callback callback return id container unsubscribe function topic id let subscribers for let subscriber of container topic if subscriber id id subscribers push subscriber container topic subscribers container publish function topic data for let subscriber of container topic subscriber callback data publisher let subscription publisher subscribe mouseClicked function data console log Sam s callback for mouse click Event Data JSON stringify data let subscription publisher subscribe mouseHovered function data console log Sam s callback for mouse hovered Event Data JSON stringify data let subscription publisher subscribe mouseClicked function data console log Sarah s callback function for mouse click Event Data JSON stringify data publisher publish mouseClicked data data publisher publish mouseHovered data data unsubsribe from an event publisher unsubcribe mouseClicked subscription publisher publish mouseClicked data data publisher publish mouseHovered data data The observer design pattern is extremely useful in situations where we need to perform multiple operations based on a single event that is being fired Example Imagine a scenario where we need to make multiple AJAX calls to an API and then we need to go a step further and perform other AJAX calls depending on our result from the data returned from our initial set of calls You would have to nest the AJAX calls one within the other possibly entering into a situation known as callback hell Using the publisher subscriber pattern is a much more elegant solution Downsides of the Observer Design PatternDifficult testing of various parts of our system Prototype Design PatternAs noted throughout the entirety of this article JS does NOT support classes in the classical OOP native understanding Due to this fact inheritance between objects is implemented using prototype based programming This allows us the ability to create objects which can serve as a prototype for other objects being created in JavaScript The prototype object is used as a blueprint for each object the constructor creates Let s show a simple implementation of this prototype pattern implementation in JS let PersonPrototype hi function console log Hello my name is this name and I m this age bye function console log I m this name and I m saying bye now function Person name age age age name name John Doe function constructorFunction name age this age age this name name constructorFunction prototype PersonPrototype let obj new constructorFunction name age return obj let person Person let person Person Tim person hi hello my name is John Doe and I m person hi hello my name is Tim and I m Prototyping is how inheritance works in JS and this is just a simple example of its implementation Command Design PatternThe command design pattern is something we can use in cases when we want to decouple objects executing the commands from objects issuing the commands that we want to execute Example Imagine a situation where our application is using a large amount of API calls for given application services These API services change Understanding this weird oddity in the challenge to implementing a solid coding solution for this problem we could use the Command Design Pattern We d want to implement an abstraction layer This abstraction layer would separate the objects calling an API service from the objects which are telling them when to call the API service This implementation would avoid the need to modify our code in all of the places where we have a need to call the service Rather we d have to change the objects that are making the calls themselves which is saying we only need to make the change in one place instead of multiple places A huge point when it comes to design patterns is that we must become accustomed to understanding the trade offs we are making when deciding to utilize any given design pattern Are we adding un needed abstraction layers or are we solving a dependency erosion issue that calls for abstraction layer to solve properly let invoker add function x y return x y subtract x y return x y let manager execute function name args if name in invoker return invoker name apply invoker slice call arguments return false console log manager execute add console log manager execute subtract Facade Design PatternWhat s the Facade design pattern Using this design pattern we are able to create an abstraction layer between what is shown publicly and what is implemented behind the curtain This design pattern is powerful to increase readability A great example of this pattern would be selectors from DOM manipulation libraries such as jQuery Dojo or D You might have noticed using these libraries that they have very powerful selector features you can write in complex queries such as jQuery parent child div span In this example the selection feature syntax is simplified quite a bit Even though it seems simple on the surface the logic behind the scene being implemented is much more complex Under the hood we re doing a lot but the externally facing API end users in this case developers being the end users is simplified We love simplifying Next StepsDesign patterns are one of the most powerful tools in a software engineers tool belt if you re looking to turn yourself into a senior JavaScript developer there are a plentiful amount of these design patterns you should be aware of Knowing how when where and the trade offs of implementing design patterns are all characteristics that the JavaScript engineers that lead teams should understand very well Refactoring Guru is a great resource to utilize when it comes to understanding these design patterns We could display a hundred more design principle examples in this article but the truth is one article can t encompass all of the available design principles out their at your disposable I highly recommend making it a goal to learn two new design principle per week After a year you ll have design principles at your disposable You ll be multiple times more valuable as a software engineer to any team and organization For those interested to take the deep dive now I recommend the Gang of Four book Design Patterns Elements of reusable object oriented software Thanks for reading and feel free to follow Clean Code Studio for more Clean Code StudioClean Code ltag user id follow action button background color d important color ffffff important border color d important Clean Code StudioFollow Clean Code Clean Life Simplify	2021-08-02 06:30:10
海外TECH	DEV Community	MATLAB MONDAYS💥- Crash Course part-6	https://dev.to/aatmaj/matlab-mondays-crash-course-part-6-2c3c	MATLAB MONDAYS Crash Course part Welcome all ️‍This Monday let us learn pre baked MATLAB functions which we can just use off the shelf After that we will learn the loop in MATLAB Many times we need to access the elements in middle of a vector or matrix MATLAB provides easy methods to extract out the elements Accessing vector elements We can access and the vector elements as shown in the example gt gt x gt gt x ans gt gt x gt gt xx MATLAB also allows us to access many elements at once The result is a n element vector gt gt x gt gt y x y gt gt y x y An alternative may be gt gt x gt gt data gt gt y x data y We can acess the last element of thee vector using the end keyword gt gt x gt gt x end ans gt gt x end ans Accessing matrix values Matrix values require both the row and the column number to be accessed gt gt x rand x gt gt x ans We can also extract a whole matrix using the syntaxx rows columns where rows is a array of rows while columns is array of columns Here is are two examples which will make things very clear Note that means while comma separated means In order to take an entire column or row we can just place a semicolon for it Here is an example gt gt x rand x gt gt x ans gt gt x ans That s all for this week Your comments really motivate me so for any suggestions or doubts please comment below and I will be happy to help ️Follow me for updates Also you can gmail me for any suggestion or help Bye for now Meet you all soon️	2021-08-02 06:24:19
海外TECH	DEV Community	How to Change Application Name and Launcher Icon in Flutter.	https://dev.to/thisishariharen/how-to-change-application-name-and-launcher-icon-in-flutter-5428	How to Change Application Name and Launcher Icon in Flutter Hey there Today I ll teach you how you can change the default application name and launcher icon for a Flutter Application Sometimes we create an application and give it a random name but sooner or later we realized that we need to change the name of the application The same thing happens for the launcher icon also Flutter has set its own default icon as a launcher icon when we create an application So I ve written this blog that will guide you step by step that how you can change the name and icon of a Flutter application This article will guide you for both the platforms Android and iOS Step Changing the App Launcher NameBy default when a flutter app gets installed the app name on the launcher is your Flutter project name To change that to your desired application name on Android or iOS both you need to change AndroidManifest xml and Info plist respectively For AndroidInside find lt application gt and change its android label property with your desired app name android app src main AndroidManifest xml lt application android name io flutter app FlutterApplication android label your app name android icon mipmap ic launcher gt For iOSios Runner Info plist lt key gt CFBundleName lt key gt lt string gt your app name lt string gt That s it By having these changes we ll get an updated application name in the launcher when our app gets installed on a device So We are done with the application name here Step Change App Launcher IconIn step we change the application name to our desired one and now it s time for the application icon As Android developers we know we ve to put the app icon in the res folder Additionally we ve to put the app icon in different sizes and that will be a headache we guess Don t worry we have a library for changing the app launcher icon in the Flutter Obviously to do so at least we need a single icon So take a high resolution icon possibly x of your application and generate a launcher icon using follow In Flutter there is a dependency for the launcher icon which is published by fluttercommunity devPlease check the link for dependency to get more details You can find how to integrate that library into a project by going to that link and move to the installation section Dependency Flutter Launcher IconsFor those who re still reading further let me guide you all here how to integrate this dependency in the project pubspec yamlStep Add this line in pubspec yaml Make sure you put your launcher icon in the proper assets folder and give a path to image path attribute dev dependencies flutter launcher icons latest version flutter icons android true ios true image path assets icon icon png For more attributes please check on the pub dev link provided above Step Run the package by the following command flutter pub getflutter pub run flutter launcher icons mainThat s It We are done here updating the app launcher icon When this process gets finished and the app gets installed we ll get to see the updated app icon in the launcher Additional Step Change the app icon manuallyIf the command from the package above didn t work for us or maybe we need more customization we can also set the launcher icon manually AndroidGo to android app src main res folder where we will get to see some folders beginning with mipmap which represent different pixel densities Replace the launcher icon png file in each folder to use custom icons iOSThe icon config files are located inside ios Runner Assets xcassets AppIcon appiconset The Contents js onfile defines a list of icon images with different sizes and scales The files are located in the same folder Before updating our application icon to our desired one It s recommended to follow the guideline for designing the iOS icon This will simply remove some headaches of releasing our application That s it all for this article I wish to share more articles in the future If you find any difficulties while understanding this article or you have any doubts Let me know by posting your questions and give me a chance to help you out If you like it then don t be a stranger give me few likes amp you can also buy me a coffee before leaving Cheers Buy Me a Thanks Catch Y all Soon Originally posted on Medium com Link	2021-08-02 06:12:03
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