投稿時間:2023-08-11 12:05:40 RSSフィード2023-08-11 12:00 分まとめ(7件)

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IT	ITmedia 総合記事一覧	[ITmedia News] X（旧Twitter）のCEO、ビデオチャット機能やマスク氏とザッカーバーグ氏の戦いについて語る	https://www.itmedia.co.jp/news/articles/2308/11/news060.html	itmedianewsx	2023-08-11 11:32:00
海外TECH	DEV Community	State Management with RxJS and React	https://dev.to/brainiacneit/state-management-with-rxjs-and-react-1dj6	State Management with RxJS and React IntroductionBuilding big web apps can be tricky especially when you have lots of different pieces of information to keep track of But don t worry RxJS is here to help It s like a really cool tool that helps you manage all your data in one place With RxJS you can create these things called streams of data that different parts of your app can use It s like a big river flowing through your app keeping everything connected and in sync In this article we ll show you how to use RxJS to build web apps that are really easy to manage and work great By the end of the article you ll know how to use RxJS to manage all your data and build even bigger and better web apps Why RxJS for State Management Hey do you ever get confused when you re building a big web app and you have lots of different pieces of information to keep track of That s where RxJS comes in It s like a really cool library that helps you manage all your data in one place With RxJS you can create streams of data that different parts of your app can use It s kind of like a river flowing through your app keeping everything connected and in sync RxJS also helps you break down your app into smaller pieces which is like having different rooms in your house for different stuff That way it s easier to keep everything organized and find what you need Overall RxJS is a great tool for managing data in big web apps Whether you re building a simple app or a really big one RxJS can help you keep everything under control A to do list exampleThe easiest way to apply a new technology or a new proof of concept is to make a to do list The Store const subject new Subject const initialState Task let state initialState export const todoStore init gt subject next state subscribe setState any gt subject subscribe setState addTask content string gt const task content id uid isDone false state state task subject next state removeTask id string gt const tasks state filter task gt task id id state tasks subject next state completeTask id string gt const tasks state map task gt if task id id task isDone task isDone return task state tasks subject next state initialState This code defines a simple store for managing a to do list using RxJS The store is implemented using a Subject and provides methods for adding removing and completing tasks The init function initializes the store by publishing the current state to the subject using subject next state This function is typically called when the app is first loaded to ensure that the store is up to date The subscribe function allows components to subscribe to changes in the store When the store is updated the setState function passed to subscribe will be called with the updated state This function is typically used by components that need to display the current state of the store Overall init and subscribe are two important functions in this code that enable developers to manage the state of a to do list using RxJS Usage It s very easy to implement this kind of state management just do this one the highest level const tasks setTasks useState lt Task gt useEffect gt todoStore subscribe setTasks todoStore init This code uses React hooks to subscribe to and initialize a store that manages a to do list using RxJS The useState hook creates a state variable named tasks and a function named setTasks for updating that state The argument passed to useState sets the initial value of tasks to an empty array The useEffect hook is used to subscribe to and initialize the todoStore The todoStore subscribe setTasks line subscribes the setTasks function to changes in the store This means that whenever the store is updated setTasks will be called with the updated state and tasks will be updated accordingly The todoStore init function initializes the store by publishing the current state to the subject using subject next state ConclusionSo that s it We ve learned how to use RxJS and React to build a to do list application We used RxJS to manage the state of the application and React to display the current state to the user We saw how RxJS provides a powerful set of tools for managing state including observables operators and subjects And we also learned how to use React hooks like useState and useEffect to update the application state in real time By using RxJS and React together we ve built a cool app that s easy to use and maintain And we ve learned some really valuable skills that we can use to build even more amazing web applications in the future If you think the article is too obscure check these out Source Code Demo	2023-08-11 02:21:49
海外科学	BBC News - Science & Environment	Russia launches first space mission to Moon in 47 years	https://www.bbc.co.uk/news/world-europe-66470294?at_medium=RSS&at_campaign=KARANGA	india	2023-08-11 02:42:37
ニュース	BBC News - Home	Russia launches first space mission to Moon in 47 years	https://www.bbc.co.uk/news/world-europe-66470294?at_medium=RSS&at_campaign=KARANGA	india	2023-08-11 02:42:37
ニュース	BBC News - Home	Angus MacNeil: SNP MP announces expulsion from party after chief whip row	https://www.bbc.co.uk/news/uk-scotland-scotland-politics-66470026?at_medium=RSS&at_campaign=KARANGA	westminster	2023-08-11 02:17:38
ビジネス	東洋経済オンライン	酷暑の夏､停電･断水からペットの健康を守る方法 特に注意したいのが｢熱中症｣疑われる症状は？ | ペット | 東洋経済オンライン	https://toyokeizai.net/articles/-/693754?utm_source=rss&utm_medium=http&utm_campaign=link_back	東洋経済オンライン	2023-08-11 11:30:00
IT	週刊アスキー	台湾TEXのスペースセーバーキーボード「Shura」（修羅）を衝動買い	https://weekly.ascii.jp/elem/000/004/149/4149388/	shura	2023-08-11 11:30:00