投稿時間:2023-02-12 06:13:32 RSSフィード2023-02-12 06:00 分まとめ(17件)

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python	Pythonタグが付けられた新着投稿 - Qiita	kintoneのアプリレコードにpythonで登録する方法（レコード1件）	https://qiita.com/guitar_ell_r/items/61ddb650d1d3eed87cbd	kintone	2023-02-12 05:38:24
海外TECH	MakeUseOf	What Is the Program Compatibility Troubleshooter on Windows 11, and How Do You Use It?	https://www.makeuseof.com/program-compatibility-troubleshooter-windows-11-guide/	What Is the Program Compatibility Troubleshooter on Windows and How Do You Use It Here s how to get the most out of the Program Compatibility troubleshooter on Windows to help your apps run better	2023-02-11 20:16:16
海外TECH	DEV Community	Decoding JS: Polyfills and Transpilers	https://dev.to/harshitakanal/decoding-js-polyfills-and-transpilers-3b87	Decoding JS Polyfills and Transpilers PolyfillsA polyfill is a piece of code in JavaScript that is used to provide some functionality in a browser that does not natively support it They are written to replicate an API that is available in some browsers for those who don t have it or don t have it completely working Sometimes they are also used to solve the issue of different browsers implementing the same feature in different ways and giving JavaScript a standard compliant way of accessing the feature this reason for poly filling was prevalent in the old IE and Netscape days where each browser used to implement different features differently Simply put one can imagine a polyfill as a common paste which can be used to fill holes and cracks to smooth out any defects in a wall In the UK there is a popular brand name for this paste which is called “Polyfilla The JavaScript Polyfill fills in for the same pieces of missing functionality across browsers Interesting stuff Some ExamplesModern language features not only include operators or syntactic constructs but also functions or methods Consider the String prototype startsWith method It is used to determine if a string begins with the characters of a specified string returning true or false as appropriate Example startsWith searchString startsWith searchString position const myString I am learning polyfill console log myString startsWith I am Expected output trueconsole log myString startsWith hello Expected output falseSay there exists some super legacy browser which doesn t support this method and it would not perform as expected in this browser to make up for it we need to write a polyfill for this method It would look something like this If the method doesn t exist if String prototype startsWith Use a function that takes the same params with position defaulting to if not supplied and perform the same functionality as the original method using the substr method String prototype startsWith function searchString position position position return this substr position searchString length searchString Let s take another example Math trunc n is a function that “cuts off the decimal part of a number e g Math trunc returns If this function is not supported in some browsers this function may fail there A polyfill for it may look like this if Math trunc if no such function implement it Math trunc function number Use the Math ceil and Math floor methods supported in legacy browsers to implement it return number lt Math ceil number Math floor number The Number isNaN feature earlier had limited support in several browsers A popular polyfill for it looks like NaN NaN returns a true and hence this logic and exception if Number isNaN Number isNaN function isNaN x return x x Also remember Not all new features are fully polyfillable Sometimes most of the behaviour can be polyfilled but there are still small deviations You should be really really careful in implementing a polyfill yourself make sure you are adhering to the specification as strictly as possible Or better yet use an already vetted set of polyfills that you can trust such as those provided by ES Shim and ES Shim Packages like Core js can help here TranspilersA transpiler is software that would translate one piece of code to another It can read modern source code and rewrite it for legacy browser engines using older syntactic constructs A popular example is the nullish coalescing operator JavaScript before didn t have this operator so older browser engines would fail to understand something like name name No name A transpiler would understand this and rewrite it to before transpilingname name No name after transpilingname name undefined amp amp name null name No Name This code could be understood by older browsers Developers run the transpiler on their computers and deploy this code to the servers Some popular transpilers include Babel Build systems or bundlers such as webpack provide a means to run a transpiler automatically on every code change So they could be integrated into development processes TL DR In this article we learned about ways to fill in missing syntactic or functional holes in JavaScript Polyfills provide a way to fill in functional holes So you have a way to fill in for that new shiny blazing fast feature in your oldie browsers However syntactic gaps are hard to fill since they are just unrecognizable symbols for older engines Transpilers provide a way to fill in just that	2023-02-11 20:28:18
海外TECH	DEV Community	Getting Started with React.js: A Comprehensive Guide for Beginners	https://dev.to/haszankauna/getting-started-with-reactjs-a-comprehensive-guidefor-beginners-3bp2	Getting Started with React js A Comprehensive Guide for BeginnersReact js is a popular JavaScript library used for building user interfaces UIs and single page applications SPAs It was released in by Facebook and since then it has become one of the most popular open source JavaScript libraries for web development From startups to large enterprises developers around the world are using React js to create powerful web applications If you are just starting out with React js and looking for a comprehensive guide to get you started you are in the rightplace In this blog post we will cover all the key concepts of React js from setting up your environment to building a simple React js application We ll also discuss some best practices and resources for learning React js So let s dive right in What is React js React js is a JavaScript library used for building user interfaces UIs and single page applications SPAs It was created by Facebook in and has since become one of the most popular open source JavaScript libraries for web development React js is component based and follows a component driven development approach It is used for creating reusable UI components that can be used in different parts of an application React js is built on top of JavaScript so you must have a basic understanding of JavaScript before you start learning React js React js is also used alongside other libraries and frameworks like Redux MobX and Express js Benefits of Learning React jsThere are many benefits to learning React js The most important ones are listed below Easy to Learn React js is easy to learn and understand even for beginners It has a simple syntax and is well documented so you can quickly get up to speed Component Based React js is component based so you can easily create reusable components that can be used across different parts of an application This makes development faster and more efficient High Performance React js is fast and efficient so you can create high performance web applications with ease Scalable React js is highly scalable so you can easily add new features and make changes without affecting the overall performance of the application Popular React js is one of the most popular open source JavaScript libraries and it s used by companies like Facebook Airbnb and Netflix Key Concepts of React jsBefore you start building React js applications it s important to understand the key concepts of React js Components Components are the building blocks of React js applications They are reusable pieces of code that can be used in different parts of an application JSX JSX stands for JavaScript XML It is a syntax extension to JavaScript that allows you to write HTML like code in your React js components Props Props are data passed from parent components to child components They are used to customize and control the behavior of components State State is a JavaScript object that stores data for a component It is used to store data that can change over time such as user input or data from an API Lifecycle Methods Lifecycle methods are functions that are called at different stages of a component s lifecycle They are used to set up update and clean up a component Setting up Your Environment for React js Before you can start building React js applications you need to set up your development environment This includes installing Node js a JavaScript runtime environment and setting up your project directory To install Node js you can download it from the official website Once you have installed Node js you can create a project directory and install the necessary packages To do this you can use the command line or a package manager like npm or yarn Understanding the Syntax of React jsThe syntax of React js is based on JavaScript so it s important to have a basic understanding of JavaScript before you start learning React js A React js component is a JavaScript function that returns a React element A React element is an object that represents a DOM element React elements can be created using the React createElement function or JSX syntax JSX is a syntax extension to JavaScript that allows you to write HTML like code in your React js components It makes iteasier to read and write React js code Using Components in React jsComponents are the building blocks of React js applications They are reusable pieces of code that can be used in different parts of an application Components are created using the React createClass function This function takes an object as an argument which contains the component s state and methods The component s state is an object that stores data for the component and the methods are functions that are called at different stages of the component s lifecycle Components can also be nested which means that a component can contain other components This allows you to create complex user interfaces out of simple components Building a Simple React js AppNow that you understand the basics of React js let s build a simple React js application We ll use the create react appcommand line tool to create a basic React js application First we ll install the create react app command line tool To do this we ll use the npm install command Once the toolis installed we can create a new React js application by running the create react app command This will create a newproject directory with all the necessary files and dependencies Next we ll create a component for our application This component will be the root component of our application It will contain the other components and control their behavior Finally we ll add the necessary code to render our component We ll use the ReactDOM render function to render our component in the DOM Data Binding in React jsData binding is the process of connecting data from a component s state to its UI elements This allows you to update the UI when the component s state changes In React js data binding is done using the setState function This function takes an object as an argument and updates the component s state with the new data React js also provides two way data binding which means that data can be bound to both the component s state and its UI elements This allows you to update the UI when the component s state changes and also update the component s state when the UI elements change Debugging React js AppsDebugging is an important part of developing React js applications It allows you to find and fix errors in your code quickly and easily The React js DevTools extension is a Chrome browser extension that allows you to debug React js applications It provides a detailed view of the components their state and their props as well as a console for logging and debugging The React js DevTools extension also provides an interactive debugger This allows you to pause the application add breakpoints and step through the code to find errors Best Practices and Resources for Learning React jsLearning React js can be overwhelming but there are some best practices and resources that can help you learn quickly and effectively Learn JavaScript First React js is built on top of JavaScript so it s important to have a solid understanding of JavaScript before you start learning React js Understand the Core Concepts Understanding the core concepts of React js is essential for becoming a successful React js developer Make sure you understand the fundamentals before you start building applications Practice Practice makes perfect Try to create as many applications as you can and experiment with different features to get a better understanding of React js Use Resources There are many resources available online that can help you learn React js Some of the most popular ones are React js official website Codecademy and the React js documentation Get Help Don t be afraid to ask for help if you re stuck There are many online communities like Stack Overflow and Reddit where you can get help from experienced React js developers ConclusionReact js is a popular JavaScript library used for building user interfaces and single page applications It has a simple syntax and is well documented so it s easy to learn even for beginners It is also component based and highly scalable so you can easily create complex applications with ease In this blog post we ve covered all the key concepts of React js from setting up your environment to building a simple React js application We ve also discussed some best practices and resources for learning React js If you re just starting out with React js this guide should help you get up to speed quickly and easily	2023-02-11 20:08:18
ニュース	BBC News - Home	Turkey earthquake rescue disrupted by security concerns as death toll rises	https://www.bbc.co.uk/news/world-middle-east-64608535?at_medium=RSS&at_campaign=KARANGA	austrian	2023-02-11 20:29:07
ニュース	BBC News - Home	Knowsley: Fifteen arrests over clash outside asylum seeker hotel	https://www.bbc.co.uk/news/uk-england-merseyside-64611823?at_medium=RSS&at_campaign=KARANGA	injuries	2023-02-11 20:23:27
ニュース	BBC News - Home	Bournemouth 1-1 Newcastle United: Visitors match club record unbeaten run in the league	https://www.bbc.co.uk/sport/football/64520929?at_medium=RSS&at_campaign=KARANGA	Bournemouth Newcastle United Visitors match club record unbeaten run in the leagueNewcastle extend their unbeaten run to a club record equalling league games but have to settle for a point on Eddie Howe s return to Bournemouth	2023-02-11 20:15:37
ニュース	BBC News - Home	Cost of living: Foodbank launched at Swansea University	https://www.bbc.co.uk/news/uk-wales-64599020?at_medium=RSS&at_campaign=KARANGA	christmas	2023-02-11 20:32:35
ニュース	BBC News - Home	Arsenal 1-1 Brentford: Gunners boss Mikel Arteta accuses officials of 'changing the rules' after equaliser	https://www.bbc.co.uk/sport/football/64612850?at_medium=RSS&at_campaign=KARANGA	Arsenal Brentford Gunners boss Mikel Arteta accuses officials of x changing the rules x after equaliserArsenal boss Mikel Arteta accuses officials of changing the rules after claiming Brentford s equaliser in Saturday s draw at Emirates should have been ruled out for offside	2023-02-11 20:14:09
ニュース	BBC News - Home	Scottish Cup: Celtic 5-1 St Mirren	https://www.bbc.co.uk/sport/football/64520976?at_medium=RSS&at_campaign=KARANGA	Scottish Cup Celtic St MirrenDaizen Maeda s first half strike is followed by a brace from Reo Hatate and goals by Oh Hyeon gyu and Matt O Riley as Celtic ease past St Mirren to reach the Scottish Cup quarter finals	2023-02-11 20:12:56
ニュース	BBC News - Home	Women’s T20 World Cup 2023: Australia thrash New Zealand by 97 runs in Paarl	https://www.bbc.co.uk/sport/cricket/64612023?at_medium=RSS&at_campaign=KARANGA	Women s T World Cup Australia thrash New Zealand by runs in PaarlA dominant Australia make an ominous start to their Women s T World Cup campaign by thrashing New Zealand by runs in Paarl	2023-02-11 20:03:44
ビジネス	ダイヤモンド・オンライン - 新着記事	サッポロ社長が語る「黒ラベル好調、ヱビス苦戦」でもビール二刀流を続ける理由 - ビール完敗	https://diamond.jp/articles/-/317094	次の一手	2023-02-12 05:20:00
ビジネス	ダイヤモンド・オンライン - 新着記事	管理職が絶対知っておくべき、部下を叱っても嫌われない話し方の「カキクケコ」　 - あなたの「話し方」が変わる！	https://diamond.jp/articles/-/317125	管理職が絶対知っておくべき、部下を叱っても嫌われない話し方の「カキクケコ」あなたの「話し方」が変わるビジネスの世界では「話し方」一つで大成功を手にすることもあれば、大損失を被ることもあります。	2023-02-12 05:15:00
ビジネス	ダイヤモンド・オンライン - 新着記事	千葉県の有料老人ホームランキング！高評価の施設ベスト64【2023年版】 - 最適な介護施設選び＆老人ホームランキング	https://diamond.jp/articles/-/316637	介護施設	2023-02-12 05:10:00
ビジネス	ダイヤモンド・オンライン - 新着記事	柴咲コウが朝ドラで演じた人物のモデル・三浦環、伝説的オペラ歌手の最新評伝が面白い - ビジネスを強くする教養	https://diamond.jp/articles/-/317447	柴咲コウが朝ドラで演じた人物のモデル・三浦環、伝説的オペラ歌手の最新評伝が面白いビジネスを強くする教養今でこそ世界の歌劇場で歌って演じる日本人オペラ歌手は増えているが、年以上前に英ロンドンでデビューし、欧米各国で活躍した女性がいた。	2023-02-12 05:05:00
ビジネス	東洋経済オンライン	出生率0.81の｢韓国｣で起きている少子化の深刻 OECD加盟国の中で1を唯一下回る､対策は？ | 子育て | 東洋経済オンライン	https://toyokeizai.net/articles/-/651025?utm_source=rss&utm_medium=http&utm_campaign=link_back	少子化対策	2023-02-12 05:40:00
ビジネス	東洋経済オンライン	ジブラルタル海峡｢鉄道トンネル｣は実現するか 欧州とアフリカを直結､計画は40年以上前から | 海外 | 東洋経済オンライン	https://toyokeizai.net/articles/-/651815?utm_source=rss&utm_medium=http&utm_campaign=link_back	東洋経済オンライン	2023-02-12 05:20:00