投稿時間:2022-04-09 22:21:16 RSSフィード2022-04-09 22:00 分まとめ(20件)

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AWS	lambdaタグが付けられた新着投稿 - Qiita	RustとAWS Lambdaで定期的に価格チェックしてメール送信する	https://qiita.com/ysirman/items/781e15d8f87ece6b41f9	awslambda	2022-04-09 21:48:58
Ruby	Rubyタグが付けられた新着投稿 - Qiita	プロジェクトのgem, 端末にインストールされるgem,どっちを使うか指定する方法	https://qiita.com/qo_op/items/dd08bd85e4a7726b5128	管理ツール	2022-04-09 21:08:49
AWS	AWSタグが付けられた新着投稿 - Qiita	RustとAWS Lambdaで定期的に価格チェックしてメール送信する	https://qiita.com/ysirman/items/781e15d8f87ece6b41f9	awslambda	2022-04-09 21:48:58
AWS	AWSタグが付けられた新着投稿 - Qiita	AWS公式資料で挑むSCS認定(35)-こんな時どうする(全分野その12)	https://qiita.com/mingchun_zhao/items/e6de42ff0bb4b25cdd48	linux	2022-04-09 21:39:13
AWS	AWSタグが付けられた新着投稿 - Qiita	[個人的] AWS タグ戦略	https://qiita.com/wagasa2/items/abd7954ae58a68019219	project	2022-04-09 21:03:17
Ruby	Railsタグが付けられた新着投稿 - Qiita	プロジェクトのgem, 端末にインストールされるgem,どっちを使うか指定する方法	https://qiita.com/qo_op/items/dd08bd85e4a7726b5128	管理ツール	2022-04-09 21:08:49
技術ブログ	Developers.IO	「ふりかえりカンファレンス2022」に参加してみた #ふりかえりカンファレンス	https://dev.classmethod.jp/articles/retrospective-conference-2022-furikaeri/	yuimayforblue	2022-04-09 12:35:20
技術ブログ	Developers.IO	Azure Firewallを配置したときにアプリケーションでクライアントIPアドレスを取得する	https://dev.classmethod.jp/articles/web-azure-firewall-dnat-client-ipaddress/	application	2022-04-09 12:16:16
海外TECH	DEV Community	PHP Realtime Chat Template	https://dev.to/carleii/php-realtime-chat-template-1d5o	PHP Realtime Chat Templatei wish there were tons of contributors on this project I laid the foundation together let s do something Phew in the meantime follow me	2022-04-09 12:44:09
海外TECH	DEV Community	10 JavaScript concepts for React beginners	https://dev.to/sm0ke/10-javascript-concepts-for-react-beginners-4j6n	JavaScript concepts for React beginnersReact is a Javascript frontend library and if you want to get started with React first you have to learn Javascript the programming language that powers React Javascript itself is a huge language and it s not possible for you to learn all of it before learning React But fear not this article explains Javascript concepts you must learn before moving on to React Thanks for reading Topics covered What is Javascript Short infoIntroduction to ReactConcept VariablesConcept Functions DefinitionConcept Classes and the Extend keywordConcept Async AwaitConcept Array methodsConcept Ternary OperatorConcept Template LiteralConcept DestructuringConcept Spread OperatorConcept Import and ExportCode a Hello World in React What is JavaScriptJavaScript is a high level scripting language for web pages It was invented by Brendan Eich in At first JavaScript s work was to make the web page interactive but later developers built frameworks and libraries to make JavaScript available almost on all platforms For instance you can build a mobile app with react native a desktop app with electron backend with node js and frontend with react js etc These are just a few things I mentioned JavaScript is capable of doing if I say all the things javascript is capable of doing it will be an article itself With that said let s move on and see what React is What is React React js is an open source JavaScript front end library created and maintained by Facebook It s a component based library which means React breaks down a bigger application into smaller pieces named components This approach makes building and managing bigger projects easier In case this is your first contact with React you should note that React is a library and not a framework like Angular js which means it s not a complete solution When building apps with React you need to use external libraries for things like routing HTTP requests and state management This is the short intro to react if you wanna learn more I ll put a few free resources at the end of the article go check them out Enough of the definitions now let s get to the JavaScript concepts you need to learn before learning React VariablesBefore getting started with React you must how to declare a variable in javascript You can declare variables in javascript in three ways using var let or const each of them has pros and cons var foo hello world let bar Hey There const baz What s up There s a quiet difference between these three Because the “var type will make the variable visible in the global scope “let or “const is recommended To learn more about each definition feel free to access a full tutorial that covers in deep of the differences Functions DefinitionReact s fundamental rule is to break a bigger project into smaller components And those components are either Functions or Classes So knowing how to declare a function with JavaScript is very important Also as with the variables there are more than ways to declare a function but these are the most important Function declarationArrow FunctionLet s see the examples of each one Function Declaration function declarationfunction add num num return num num add This is how you would declare and call a function in plain Javascript Now that you know how to declare a simple function with javascript let s see how it is used in React js In React functions are used to create functional components function App return lt div className App gt lt h gt Hello world lt h gt lt div gt This is the use of function declaration in React As you can see a component does not return any value it returns the HTML which determines how the application will look Arrow Function Arrow functionconst subscract num num gt return num num subtract The arrow function is just a little cleaner than the function declaration there s not much difference between these two Example of functional components const App gt return lt div className App gt lt h gt Hello world lt h gt lt div gt Just like the arrow function the arrow function component is a little cleaner than the function declaration It looks nicer and more intuitive Classes and the Extend keywordAs I said before React has class components and functional components The functional component is built with functions and the class components are built with classes Let s look at the example of the javascript class then we will look at react class components javascript classlet Rectangle class constructor height width this height height this width width const square new Rectangle console log square height output Javascript classes are just templates for creating objects with the new keyword you can create a new object from the class you can also use the extend keyword to create a new object from the class Example of Class component class App extends Component render return lt div gt App lt div gt Here we created a class component by extending the component class it s just the javascript class that returns HTML JSX Async AwaitAsync await is a very important javascript concept but before we get into them you ll first need to understand asynchronous javascript Asynchronous JavaScriptWhen building web apps you ll need to make API calls to get data from the backend and these fetching operations might take a while to finish While fetching the data all the other functionalities would freeze To prevent this javascript introduced asynchronous functions That means asynchronous functions help you write code that will get the data from the API at the same time won t block the rest of the application This is asynchronous javascript There are a few ways to handle asynchronous code but I am going to talk about async await because it is currently the best way to handle async code Let s start with an example async function getPersonsInfo name const people await server getPeople const person people find person gt return person name name return person Async the async keyword declares that this function is an asynchronous function an async function automatically returns a promise an async keyword can be used in all types of functions like arrow function callback function or function expression Await What the await keyword does is it says an async function to wait to finish the operation It is the same as the then block of a Promise It s just much cleaner One note here is that you can only use the await keyword inside an async function otherwise you ll get an error Handling ErrorsAs you can see the await keyword waits for the promise to resolve and returns the result we need to keep in mind that our promise can be rejected so now we need a way to handle that We can handle errors in the async function in ways Solution Use try catch blocks asyncFunctionCall catch error gt console error error Solution Use Inner try catch block async function getPersonsInfo name try const people await server getPeople const person people find person gt return person name name console log person catch error console error error Async await in Reactconst App gt useEffect gt declare the data fetching function const fetchData async gt get the data const data await fetch lt gt call the function fetchData make sure to catch any error catch console error return lt gt lt gt Concept Array methodsArray methods are ways to manipulate arrays in javascript Knowing how these methods work will come in handy in the future Because when you start building projects with react you ll use them all the time array map array map creates a new array by applying a callback function on each element of the array also it does not change the original array Code Sampleconst numbers const newArr numbers map myFunction function myFunction num return num console log numbers console log newArr array filter array filter loop through all the elements of an array and filter out the elements that match the condition in the callback function just like the map method it doesn t change the old array Code Sampleconst ages const result ages filter checkAdult function checkAdult age return age gt console log ages console log result Example in React for map function App const names sam jack tom dave return lt div className App gt lt h gt Hello world lt h gt names map name gt lt h gt hello name lt h gt lt div gt The above sample renders all the elements of the names array using map This is very useful and probably you ll use it all the time Example in React for filter const numbers const lessThanFive numbers filter num gt num lt console log lessThanFive console log numbers Here I filtered the numbers array to less than five This method is also very important for creating filter functionalities Ternary OperatorTernary Operator is the simplified form of the if else conditional Basically It s just another way to write if else conditional Code Sample Classic If else if elseif loading loadingComponent else App Code Sample Ternary Operatorloading loadingComponent App React Sample Ternary Operatorclass App extends Component render const isLoggedIn this state isLoggedIn return lt div gt The user is lt b gt isLoggedIn currently not lt b gt logged in lt div gt Template LiteralIf you are building a web app it s normal that you need to work with strings In earlier versions of Javascript ES if you wanted to concatenate add a string to a variable you had to use the operator And it doesn t look good and is not easy to understand But now you can use ES template literal Template literal uses notation to concatenate strings with variables Code Sampleconst name Sam const greeting Hello name console log greeting Hello Sam DestructuringDestructuring is a way to extract values from an Object or Array into variables In earlier versions of Javascript ES if you wanted to extract a value from an array or object you would do this Arrayconst foo one two const one foo const bar Tom Jerry const tom bar Now what you can do with ES modern version of Javascript restructuring is this const foo one two const one foo Objectconst bar Tom Jerry const tom bar It will assign the value one to the variable one This is much cleaner and more intuitive Example In React jsTo pass data to components React uses props Props are just like arguments in a normal function The point here is that props are objects For example if you had a component named Greeting and it takes a prop name lt Greeting name Sam gt If you want to access it you need to write props name function Greeting props return lt div gt hello props name lt div gt But also you can use restructuring like this function Greeting props const name props return lt div gt hello name lt div gt Now you can use the name without calling props name Spread OperatorA spread operator is used to copy a whole or part of an array or an object The spread operator is used to create an exact copy of an Array or an Object it is very handy when working with react states because states are immutable const arrayOne const arrayTwo const arrayThree arrayOne arrayTwo Import and ExportAs mentioned before React is a component based UI framework So to build a complete application you need to use the components you built To use the component you need to import them into the file you want to use you can use export and import to use components in your application Export Sample app js file Exports the “App objectfunction App return lt div gt App lt div gt Import Sample index js Use the “App object via an “import import App from App ReactDOM render lt React StrictMode gt lt App gt lt React StrictMode gt document getElementById root After this short introduction of useful JS concepts we can use in React curious minds might go further and code a simple Hello World in React Code Hello World project with ReactThis section explains how to code a classic “Hello World project using React and Javascript Step Install the toolsTo get started with React first you need to install Node js You can download Node from here Step Build the appAfter you ve installed NodeJS open up the terminal command line and create your project folder with this command mkdir hello react Then generate a basic React project using CRA create react app tool npx create react app my app cd my app npm start After running all these commands your browser will open up the React project on port import React from react function App return lt div gt lt div gt export default AppAnd write an h tag with Hello world inside the div import React from react function App return lt div gt lt h gt hello world lt h gt lt div gt export default App At this point you should see Hello World message in the browser Congrats From now on you are a React beginner developer ConclusionYou start learning using React without understanding the Javascript basic concepts you might be unproductive and not use the full power of React Thanks for reading For more resources feel free to access More Free Dashboards crafted in Django Flask and ReactMore Admin Dashboards a huge index with products	2022-04-09 12:18:28
海外TECH	DEV Community	Hello, everyone!	https://dev.to/quireter/hello-5bof	hello	2022-04-09 12:03:10
Apple	AppleInsider - Frontpage News	Daily deals April 9: $99 Gen 2 AirPods, $250 off Netgear Orbi Mesh Wi-Fi, $459 iPad mini, more	https://appleinsider.com/articles/22/04/09/daily-deals-april-9-99-gen-2-airpods-250-off-netgear-orbi-mesh-wi-fi-459-ipad-mini-more?utm_medium=rss	Daily deals April Gen AirPods off Netgear Orbi Mesh Wi Fi iPad mini moreAlongside AirPods and a iPad mini Saturday s top deals include the SwitchBot for off Razer s Huntsman keyboard and much more The iPad mini and the second generation AirPods are on offer today along with Netgear s Orbi Mesh Wi fi Every single day we scour the internet in search of the best tech deals available including discounts on Apple products tax software and a variety of other items all to help you save some cash If an item is out of stock you may still be able to order it for delivery at a later date Many of the discounts are likely to expire soon though so act fast Read more	2022-04-09 12:36:12
海外TECH	Engadget	The first all-civilian space crew has docked with the ISS	https://www.engadget.com/axiom-space-ax-1-iss-docked-123501915.html?src=rss	The first all civilian space crew has docked with the ISSA SpaceX Dragon capsule carrying the first fully private space crew has docked with the International Space Station The quartet launched from Kennedy Space Center in Florida on Friday morning without any major hiccups Their journey to the ISS took around hours The Dragon ran into a video routing problem before the docking sequence could start causing a minute delay as it stayed roughly meters away from the ISS while SpaceX was troubleshooting the issue nbsp The crew members ーcommander and former NASA astronaut Michael López Alegría and businessmen Larry Connor Eytan Stibbe and Mark Pathy ーare expected to spend eight days on the space station They ll conduct science experiments along with outreach and commercial activities They ll also bring some scientific samples back to Earth for NASA as well Axiom Space s first all civilian mission AX is the first of several private ISS missions the company plans to launch in the coming years It will build the first commercial module on the space station as well as a module that houses a sports arena and film studio The Axiom Station and attached film studio module are expected to separate from the ISS in Docking confirmed pic twitter com YPyFaRwOーSpaceX SpaceX April Mariella Moon contributed to this report	2022-04-09 12:35:01
ニュース	BBC News - Home	Malaysia: Boy, 14, believed dead after diving trip	https://www.bbc.co.uk/news/uk-61049323?at_medium=RSS&at_campaign=KARANGA	ordeal	2022-04-09 12:25:39
ニュース	BBC News - Home	Delays and queues amid Easter travel disruption	https://www.bbc.co.uk/news/uk-61048308?at_medium=RSS&at_campaign=KARANGA	ferry	2022-04-09 12:18:55
北海道	北海道新聞	帯広市長選、現新３氏の戦いへ　１０日告示、市議補選も	https://www.hokkaido-np.co.jp/article/667726/	帯広市長選	2022-04-09 21:19:00
北海道	北海道新聞	希少な道産食材充実　帯広・東洋運営の通販サイト「食べレア北海道」	https://www.hokkaido-np.co.jp/article/667725/	通販サイト	2022-04-09 21:17:00
北海道	北海道新聞	旭川で１１３人感染　新型コロナ	https://www.hokkaido-np.co.jp/article/667606/	上川管内	2022-04-09 21:14:46
北海道	北海道新聞	道南在住の１２９人感染　新型コロナ	https://www.hokkaido-np.co.jp/article/667615/	道南	2022-04-09 21:13:14
北海道	北海道新聞	平取の丘をウクライナの国旗色にライトアップ　避難民への寄付募る	https://www.hokkaido-np.co.jp/article/667722/	日高管内	2022-04-09 21:02:00