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12 Sep 2025
Replying to @fumokmm
reactは初版12年前 jqueryが初版19年前 まだECMAscript2015も出ていない頃のものですしある意味reactもレガシーに足を入れ始めてると思うのですね パフォーマンス的にもけして速くはなかったはずですし
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Replying to @hmmhmm_hm
계산 여러개를 연달아하면 (a b c d) 불필요하게 매번 문자열로 변환하는 비용이 좀 들거같은데 혹시 걍 BigDecimal 타입을 노출하실 계획은 없으신가여 그리고 큰수처리 직접하지마시고 ECMAScript2015 BigInt 쓰면 더 빠를거같은데 어떠세용
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Day 1 of #20DaysOfJavascript 🚀 Today we will discuss: - What is Javascript & it's role in web development - ECMAScript & different versions of JS What is Javascript? JavaScript is a versatile programming or scripting language developed by Brendan Eich in 1995. It is used for making web pages more dynamic. It allows you to add features like animations, dynamic content updates, and interactive elements to websites. Role of Javascript in Web Development - Enhanced Interactivity: JavaScript enables dynamic responses to user actions, enhancing user experience. - DOM Manipulation: JavaScript allows developers to dynamically alter webpage content, structure, and style forming the basis of modern web apps. - Asynchronous Programming: JavaScript facilitates asynchronous programming, enabling tasks to run without blocking the main thread. This capability is vital for handling data fetching, user interactions, and animations efficiently through techniques like callbacks, promises, and async/await. - Web APIs: JavaScript provides access to browser functionalities, enriching web apps with diverse features. - Frameworks and Libraries: JavaScript offers frameworks like React and libraries like jQuery, simplifying web development tasks. - Server-Side Capabilities: Node.js enables JavaScript execution on servers, streamlining web app development. ECMAScript & Different Versions of JS ECMAScript serves as the blueprint for scripting languages like JavaScript. It's a specification managed by Ecma International, ensuring consistency and standards for languages like JavaScript. Over time, ECMAScript has evolved through different versions, with each version introducing new features, improvements, and syntax enhancements to the language. Developers commonly refer to specific ECMAScript versions when discussing JavaScript capabilities and compatibility. Version - ES1 Name - ECMAScript1 Release year - 1997 Feature - Initial Release Version - ES2 Name - ECMAScript 2 Release year - 1998 Feature - Minor Editorial Changes Version - ES3 Name - ECMAScript3 Release year - 1999 Feature Added: Regular Expression try/catch Exception Handling switch case and do-while Version - ES4 Name - ECMAScript4 (Abandoned due to conflicts) Version - ES5 Name - ECMAScript5 Release year - 2009 Feature Added: JavaScript “strict mode” JSON support JS getters and setters Version - ES6 Name - ECMAScript2015 Release year - 2015 Feature Added: let and const Class declaration import and export for..of loop Arrow functions Version - ES7 Name - ECMAScript2016 Release year - 2016 Feature Added: Block scope for variable async/await Array.includes function Exponentiation Operator Version - ES8 Name - ECMAScript Release year - 2017 Feature Added: Object.values Object.entries Object.getOwnPropertiesDescriptors Version - ES9 Name - ECMAScript2018 Release year - 2018 Feature Added: spread operator rest parameters Version - ES10 Name - ECMAScript 2019 Release year - 2019 Feature Added: Array.flat() Array.flatMap() Array.sort is now stable Version - ES11 Name - ECMAScript2020 Release year - 2020 Feature Added: BigInt primitive type nullish coalescing operator Version - ES12 Name - ECMAScript2021 Release year - 2021 Feature Added: String.replaceAll() Method Promise.any() Method Version - ES13 Name - ECMAScript2022 Release year - 2022 Feature Added: Top-level await New class elements Static block inside classes Version - ES14 Name - ECMAScript2023 Release year - 2023 Feature Added: toSorted method toReversed findLast, and findLastIndex methods on Array.prototype and TypedArray.prototypet Reference- @geeksforgeeks Here we come to an end to Day 1 concepts, stay connected for more advanced topics and concepts, see you tomorrow in Day 2 of 20DaysOfJavascript Till then do drop your Day 1's queries below 👇
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Babel as a Compiler Babel's primary role is as a compiler, transforming ECMAScript2015 code into browser-compatible JavaScript. It ensures our code can run seamlessly across different browser versions. Let's explore more! #Babel #JavaScript #WebDevelopment
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Replying to @nikitonsky
После того, как они не смогли стандартизировать именования стандартов (которые ecmascript/es, при этом es5, es6, es2017, при этом es6 это ecmascript2015) у меня к ним с одной стороны не осталось вопросов, а с другой стороны, появилось очень много 🙂
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この時期にJavascriptやろうとするとES5, ES6(ECMAScript2015), CommonJS, ES Modules,とか歴史的な話が出てきて困惑するだよね。 とりあえず初心者的に覚えやすいのは ES5は古い文法 ES6は新しい文法でECMAScript2015とも言われる require/exports (CommonJS) ES5とES6で使用可能import/export (ES modules) ES6で使用可能 とりあえず今後主流となるimport/export(ES modules)でやっておけば良いということだな!
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Our latest @BlueFlame_Labs blog highlights some of the most powerful features of modern @JavaScript. Discover some important #features that can you help you better understand #ES6 (also known as #ECMAScript2015) so your team can #program new possibilities. theblueflamelabs.com/javascr…

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昨日書いてたのはこれ。最初に見た時は「たった8行のサンプルコードなのにまったく読めない! 僕の知ってるjavascriptじゃない!」と混乱した。まあtypescriptなんだけど、ECMAScript2015 を押さえてないと読めない。特にブラケットの位置が観る度に混乱する。
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JavaScript自体は90年代末からあるわけですが、let,constが使えるようになったのはECMAScript2015からだったと思うので、var使ってるコードはネット上にも現場にもまだまだ多いと思います。
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こちら参考になさってください。今回はツイート主さんが正しいです。constという名前が悪く、誤解されるのは仕方ないとは思いますけども。 他の方も含め、正しいことを言ってるのに叩かれてらしたので可哀想だなと感じました。 左MDN 真ん中JavaScript Primer 右ECMAScript2015言語仕様(原文)
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Round 2 Day 30 of #100DaysofCode Day 130 of #365DaysOfCode Finished: - "Section 3: 2: Movie Seat Booking | DOM & Local Storage" from the course "20 Web Projects With Vanilla #JavaScript" by @traversymedia. #ECMAScript #ES1 #ES2 #ES3 #ES5 #ES6 #ECMAScript2015 #ES7 #ES2020 #JS
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5 Nov 2021
Replying to @wilbowma
ecmascript2015
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JavaScript was damn easy, until . . . Ecma International Ecmascript2015(ES6) comes into picture. And then new ways to declare variables using let, const and new memory storage called Temporal Dead Zone messed up all the old learnings.😀 #javascript #reactjs #angular ECMAS
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22 Jun 2021
«В TS, как и в ECMAScript2015, любой файл, содержащий import или export верхнего уровня (глобальный), считается модулем» Карманная книга по TypeScript. Часть восьмая. Модули: amp.gs/jINfv
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【HTML5レベル2の出題範囲が一部改定されました】 「2.1.2 ES6(ECMAScript2015)以降の新機能 」 が出題範囲に追加されます。 詳細はこちらです。 html5exam.jp/images/outline/… #LPIJapan #HTML5

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21 Apr 2021
【HTML5レベル2の出題範囲が一部改定されました】 「2.1.2 ES6(ECMAScript2015)以降の新機能 」 が出題範囲に追加されます。 詳細はこちらです。 html5exam.jp/images/outline/… #LPIJapan #HTML5

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