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キー付きコレクション - JavaScript | MDN
Map オブジェクトはキーと値のマップで、挿入順に要素を反復処理することができます。 次のコードでは Map を用いたいくつかの基本的な操作を表しています。また、追加の例や全ての API については、 Map リファレンスページをご覧ください。 for...of ループを使って、各反復処理において [key, value] からなる配列を返しています。 const sayings = new Map(); sayings.set("dog", "woof"); sayings.set("cat", "meow"); sayings.set("elephant", "toot"); sayings.size; // 3 sayings.get("dog"); // woof sayings.get("fox"); // undefined sayings.has("bird"); // fa
アロー関数式 - JavaScript | MDN
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2016年9月. Learn more See full compatibility Report feedback アロー関数式は、従来の関数式の簡潔な代替構文ですが、意味的な違いや意図的な使用上の制限もあります。 アロー関数自身には this、arguments、super へのバインドがないので、メソッドとして使用することはできません。 アロー関数はコンストラクターとして使用することはできません。 new をつけて呼び出すと TypeError が発生します。 new.target キーワードにアクセスすることもできません。 アロ
Template literals (Template strings)
Parameters string text The string text that will become part of the template literal. Almost all characters are allowed literally, including line breaks and other whitespace characters. However, invalid escape sequences will cause a syntax error, unless a tag function is used. expression An expression to be inserted in the current position, whose value is converted to a string or passed to tagFunc
Iteration protocols - JavaScript | MDN
Iteration protocols aren't new built-ins or syntax, but protocols. These protocols can be implemented by any object by following some conventions. There are two protocols: The iterable protocol and the iterator protocol. The iterable protocol allows JavaScript objects to define or customize their iteration behavior, such as what values are looped over in a for...of construct. Some built-in types a
Destructuring - JavaScript | MDN
This feature is well established and works across many devices and browser versions. It’s been available across browsers since August 2016. Learn moreSee full compatibilityReport feedback The destructuring syntax is a JavaScript syntax that makes it possible to unpack values from arrays, or properties from objects, into distinct variables. It can be used in locations that receive data (such as the
Press release 9 April 2009 - Ecma International finalises major revision of ECMAScript
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ShorterMaps 2.2 released: ES6 map shorthand for Elixir
GitHub - tc39/proposal-regexp-unicode-property-escapes: Proposal to add Unicode property escapes `\p{…}` and `\P{…}` to regular expressions in ECMAScript.
ECMAScript 2015 Language Specification – ECMA-262 6th Edition
JavaScript Promiseの本