投稿時間:2022-04-10 07:07:46 RSSフィード2022-04-10 07:00 分まとめ(9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
海外TECH	DEV Community	Javascript 1O1 series : Learn syntax, variables and datatypes	https://dev.to/osam1010/javascript-1o1-series-learn-syntax-variables-and-datatypes-3cic	Javascript O series Learn syntax variables and datatypes img alt image from br gt height src dev to uploads s amazonaws com uploads articles hsnhxdepcqpjo png width You ll learn Javascript syntax statements how to define variables and how to use it and also we ll go through the most important datatypes in this languageSyntax and statements Computer programs are set of instruction will be executed by computers to get results these instructions are called statement in programming and syntax is set of rules to define how the code is constructed so we can say A JavaScript program is a list of programming statements JavaScript statements are composed of Values either variables or constants Operators Expressions Keywords and Comments and these statement are executed in the same order as they are writtenExecution order comments everything in your javascript file will be executed comments won t when you are coding and you had an idea you can simply write it on the same javascript file as comment and the browser will ignore it there are two types of comments single line and multiple lines comments this one line comments and will be ignored when executing your code this is multiple line comments and will be ignored when the browser executing your code comments in javascript variables variables are containers to store or to contain some values you can use these values by their given name identifier to initiate a variable in javascript you use var or let keywords then we give it a name variable s name usually is string and then we can give it a value or not for simplicity we ll stick with var later in tutorial we ll learn about another ways you can change variable value whenever to whatever you want by using the assignment e g variables in js data types as we said before variables are containers that contain certain values but what it could be these values datatypes are the valid types of values that the variable can have such as numbers strings boolean character arrays objects just to mention a few javascript is dynamic language what does it means it means when we define a variable we don t need to define its value s type explicitly we just sayvar x const y and the browser will understand the datatype by it self dynamic javascript typesalso javascript types are dynamic it means you can change the type that variable hold to whatever type you want let s see howtl dr a variable of the same name can be used to hold different data types Some of javascript data types Arrays var array an array is an ordered collection of values each value called an element you can access any element by it s index it s numeric position in the array we ll talk about arrays in details later Objects var object object is a variable contains set of properties each property has a name and value or An object is a composite value it aggregates multiple values primitivevalues or other objects and allows you to store and retrieve thosevalues by name from “javascript the definitive guide “JavaScript objects are written with curly braces Object properties are written as name value pairs separated by commas you can access any object property using objectName followed by dot operator and the property nameobjects in jsStrings var string “string strings are series of characters like “this is a string simply bunch of characters are written with quote You can use single or double quotes strings in jsNumbers const number JavaScript has only one type of numbers it hold all type of numbers with or without decimals Numbers in jsBoolean const boolean trueboolean can only have two values true or falseboolean values and much more of data types that available in this great language we ll see it in later lesson on this tutorial Thanks for reading and feel free to ask any question about javascript or about this series and i appreciate any feedback to improve My content find me on twitter github and my portfolio	2022-04-09 21:16:58
海外TECH	DEV Community	Firebase: The good, the bad, the awesome.	https://dev.to/jesusantguerrero/firebase-the-good-the-bad-the-awesome-bb1	Firebase The good the bad the awesome IntroductionOne of my dev colleagues said this is the best era to be a frontend developer and this is true There are technologies out there that empower us to make great applications of any kind a couple of clicks and we are ready to use them from our front end Today we are going to cover one of these technologies Firebase What is firebase Firebase is a backend as a service platform backed by Google that provides a set of tools to help developers build release and monitor web Android and IOS apps as well as engage with your users We are talking about Authentication Database Storage Real Time Database hosting and others My background with firebaseI have built some with applications with firebase but not at its full strength until February when I built zen a productivity app to help myself to focus on my tasks primarily and to participate in the Vercel amp Hasnode hackathon From the launch of Zen to the date of this post I ve used like of the tools of firebase and here are my pains the things that have made me fall in love with firebase and the ones that have been a little bit more difficult to digest At the end of this post you will gain An overview of the most important tools provided by firebase Know scenarios where firebase shines the most Limitations you could find when building apps with firebase Resources that served me to improve my firebase skills The good parts AuthI think almost every developer starts an application with the authentication flow With firebase this process is joyful and fast we have options for sign in providers from email google FB GitHub to anonymous sessions And to enable is just set the credentials and click to enable In the project we have access to the methods of auth like this export const register async email password gt return firebase auth createUserWithEmailAndPassword email password catch reason gt throw new Error reason message export const login async email password gt return firebase auth signInWithEmailAndPassword email password catch reason gt throw new Error reason message And the last step is listen when the state change to set unset the authenticated user firebase auth onAuthStateChanged user gt if user firebaseState user user Database We have two database options Firestore and Realtime Database both of which provide built in real time features coming from a MySQL background where you had to implement that functionality with other tools this is mind blowing and a killer feature by firebase and makes it a go to option for applications like chats and collaboration tools Both are No SQL document based databases Firestore is the more powerful providing advanced queries and rules You can create a collection that contains documents and every document can have subcollectionsIt allows setting rules which are conditions to allow access for collections and documents in your database Here for example we are telling to allow users to create tasks for them and allow delete and update if the user is the owner of the task match tasks taskId allow create if request auth null amp amp request resource data user uid request auth uid allow delete update if request auth null amp amp resource data user uid request auth uid But you can set more advanced rules for example with Zen I will need a sharing option in version where users can let other users see their boards We saved the collection in documents shared userUid accounts taskOwnerId The rules below would translate into If I am authenticated and the task is mine or belongs to a user sharing board with me let me read the task match tasks taskId allow read if request auth null amp amp resource data user uid request auth uid exists databases database documents shared request auth uid accounts resource data user uid FunctionsNot everything can run in the frontend there is sensitive data that requires being managed from a server Cloud Functions are the firebase way to run stuff on the server without the pain of maintaining your own server A K A serverless they are flexible and complement very well with the other firebase tools You can trigger a function on user sign ups with Auth after write update delete a document in Firestore run scheduled functions in the background the sky is the limit They even have callables that are functions you define in your backend and can invoke them from the front end just with the name no need to install Axios and make a call to an endpoint exports shareMatrix functions https onCall async data context gt const user context auth do stuff with data return OK Defining the cloud function in the backend const shareMatrix functions httpsCallable shareMatrix shareMatrix formData then gt clearForm emit saved formData Invoking the function in the frontend Other tools Other tools worth mentioning are Hosting Storage and analytics Hosting Allow to deploy multiple sites in a firebase project with SSL by default you can set custom domains and restore deployments to previous versionsStorage Allow saving files images videos audios etc in the cloud for your firebase projects Analytics Free analytics to track most used features users retention The bad Database Working with relationships in Firestore is a pain if you are working with relational data you can do two things denormalize your data in other words is okay to repeat in order to deliver a document with all the information you need in a single query the recommended way or do multiple queries to obtain your data which is not recommended for the way Firestore is priced they count reads writes and deletes the free limit is good enough but if you app success you can be charged more if you applied a bad structure in your data Vendor lock in Remember the part Backed by google well firebase has many tools and the most you use the harder is to migrate parts to other platforms you become dependent on Google if they decide to raise their prices tomorrow you don t have an easy path to save your data and restore in another service There s not fixed pricing It is not totally bad because many services work like that today but the fact that you can t predict the cost of your next invoices from an accounting point of view is bad for planning When to use firebaseWhen you need fast development it could be a plus because firebase takes care of the harder parts on Auth Storage Hosting Server Real Time etc You need real time features and your app doesn t need many relations When you also need a mobile version of your app with android React Native for example I can say from my experience is a smooth transition Prototype MVP with low cost solutions When firebase might not be the best alternativeWorking with complex database relationsYou don t want to be dependant on one vendor Wrapping upFirebase can help us develop apps faster with a low cost even in their paid option needed to use functions It s a good option for validating ideas build small side projects and if you are like me having fun trying interesting technologies If you like these features and you can check other alternatives like SupabaseAmplifyI hope you find it useful let me know about any questions you have here or on Twitter thanks for reading and have a nice day	2022-04-09 21:13:15
Apple	AppleInsider - Frontpage News	BenQ ScreenBar Halo Review: Monitor lamp cosily light up your workspace	https://appleinsider.com/articles/22/04/09/benq-screenbar-halo-review-monitor-lamp-cosily-light-up-your-workspace?utm_medium=rss	BenQ ScreenBar Halo Review Monitor lamp cosily light up your workspaceThe BenQ ScreenBar Halo casts a pool of light on your desk that helps you concentrate lets you see your working tools and papers better and creates an unexpectedly cozy atmosphere around your Mac ScreenBar Halo fits even curved monitorsIf you need more light where you work it s unlikely that your first thought will be to buy one that shines down onto that glassy reflective monitor of yours Yet BenQ s Screenbar Halo sits atop that monitor it shines down and it s excellent Read more	2022-04-09 21:44:59
ニュース	BBC News - Home	Ukraine war: Disbelief and horror after Krematorsk train station attack	https://www.bbc.co.uk/news/world-europe-61055105?at_medium=RSS&at_campaign=KARANGA	station	2022-04-09 21:28:48
ニュース	BBC News - Home	Imran Khan ousted as Pakistan's PM after key vote	https://www.bbc.co.uk/news/world-asia-61055210?at_medium=RSS&at_campaign=KARANGA	confidence	2022-04-09 21:39:39
ニュース	BBC News - Home	Royal Navy completes Arctic defence exercise	https://www.bbc.co.uk/news/uk-61053401?at_medium=RSS&at_campaign=KARANGA	norway	2022-04-09 21:05:54
ニュース	BBC News - Home	Sam Waley-Cohen: Grand National-winning jockey pays tribute to brother after 'fantasy' win	https://www.bbc.co.uk/sport/horse-racing/61050673?at_medium=RSS&at_campaign=KARANGA	Sam Waley Cohen Grand National winning jockey pays tribute to brother after x fantasy x winGrand National winning jockey Sam Waley Cohen pays tribute to his brother after fantasy triumph in his last ever ride	2022-04-09 21:09:03
ニュース	BBC News - Home	Masters: Charl Schwartzel holes eagle from 136 yards at 10th at Augusta	https://www.bbc.co.uk/sport/av/golf/61054429?at_medium=RSS&at_campaign=KARANGA	augusta	2022-04-09 21:39:23
ビジネス	東洋経済オンライン	｢BEV専業メーカー宣言｣でボルボはどうなる？ ボルボ日本法人社長に聞いた国内戦略と課題 | 電動化 | 東洋経済オンライン	https://toyokeizai.net/articles/-/580066?utm_source=rss&utm_medium=http&utm_campaign=link_back	日本法人	2022-04-10 06:30:00