In this blog post, we examine the ECMAScript proposal âSet methods for JavaScriptâ by MichaÅ Wadas, Sathya Gunasekara and Kevin Gibbons. It introduces new methods for Sets. New Set methods that return Sets  # Set.prototype.union(other)  # This method returns a Set that is the union of this and other. Type signature: Set<T>.prototype.union(other: SetReadOperations<T>): Set<T> The type of other, Set
This Stage 3 proposal is experimental. Do try it and report bugs; don't use it in production! Temporal 注: ãã®ããã¥ã¡ã³ãã¯åæãé¨åçã«æ¥æ¬èªã«ç¿»è¨³ãããã®ã§ããå ¨ã¦ã®ããã¥ã¡ã³ãï¼ããã³ææ°ã®å 容ã確èªãããå ´åã¯åæãåç §ãã¦ãã ããã Table of Contents ã¤ã³ãããã¯ã·ã§ã³ Cookbook API ããã¥ã¡ã³ã Temporal.now Temporal.Instant Temporal.ZonedDateTime Temporal.PlainDate Temporal.PlainTime Temporal.PlainDateTime Temporal.PlainYearMonth Temporal.PlainMonthDay Temporal.Duratio
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TypeScript has never been easier thanks to the TypeScript plugin for Babel (@babel/preset-typescript), an official year-long collaboration between the TypeScript and Babel teams. Discover 4 reasons why TypeScript and Babel are a perfect pair, and follow a step-by-step guide to upgrade to TypeScript in 10 minutes. Huh? What? Why?I didnât understand the need for this new preset at first. Arenât Babe
Update: The Cost Of JavaScript In 2019 is now available to read. Building interactive sites can involve sending JavaScript to your users. Often, too much of it. Have you been on a mobile page that looked like it had loaded only to tap on a link or tried to scroll and nothing happens? Byte-for-byte, JavaScript is still the most expensive resource we send to mobile phones, because it can delay inter
Warning: This blog post is outdated. Instead, read chapter âModulesâ in âJavaScript for impatient programmersâ. At the end of July 2014, TC39 [1] had another meeting, during which the last details of the ECMAScript 6 (ES6) module syntax were finalized. This blog post gives an overview of the complete ES6 module system. Module systems for current JavaScript  # JavaScript does not have built-in supp
"last 2 versions" considered harmful There comes a time in every developer's life when they come to realize their thoughtleaders misled them. Oh, we've really done it now. So remember how we told you all to use babel-preset-env? { "presets": [ ["env", { "targets": { "browsers": [ "last 2 versions" ] } }] ] } See browserlist coverage We told you to use it because it would only compile the things th
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Users of today's web expect that the pages they visit will be interactive and smooth, and that's where you need to increasingly focus your time and effort. Pages shouldn't just load quickly, but also respond quickly to user input throughout their entire lifecycle. In fact, this aspect of the user experience is precisely what the Interaction to Next Paint (INP) metric measures. A good INP means tha
What you need to know about this book This book is about ECMAScript 6 (also called ECMAScript 2015), a new version of JavaScript. Audience: JavaScript programmers In order to understand this book, you should already know JavaScript. If you donât: my other book âSpeaking JavaScriptâ is free online and teaches programmers all of JavaScript (up to and including ECMAScript 5). Why should I read this b
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