computed property names ? JavaScript function: get: Computed property names. オブジェクト初期化の際に使える「名前」は、以下の四種類ということになります。 . 名称は "Computed Property Names" という らしい。MDNだと日本語訳で『計算されたプロパティ名』になっている。 https://developer.m… 読者になる ひと夏の技術. … Quentin. They are called "computed property names" From MDN: Starting with ECMAScript 2015, the object initializer syntax also supports computed property names. It’ll then use the result of the expression as the property name of an object. computed property names mdn JavaScript: Computed property names - techtutorialsx getter - JavaScript | MDN 语法，另外还可以使用 [] 传入一个结果为字符串的表达式。 使用 . Method definitions - JavaScript | MDN Starting with ECMAScript 2015, the object initializer syntax also supports computed property names. This is one of the best features of ES6 I have seen, because it allows you to write more declarative and beautiful code. ES6 allows you to use an expression in brackets []. let and const bindings (complete) ECMAScript 6, MDN. To use computed property names, we simply use square brackets and put an expression inside them, when creating the object, like illustrated below. If the computation is expensive to run, consider memoizing it. Destructuring assignment allows you to unpack the parts out of this array easily, ignoring the … ES6 计算属性 名 ES6 中引入了 计算属性 名，英文是 computed property names ，它可以在对象字面量中动态 计算属性名称 。 我们知道添加或修改对象的 属性 有两种常用的方法，一种是使用 . nam e = '钢铁侠' person. So, it can be any string, including '1foo', '!bar! Like an object literal, you can use computed properties for getters and setters of a class. For example: The get [name] is a computed property name of a getter of the Person class. At runtime, when you access the fullName property, the person object calls the getter and returns the full name. When you have some data that needs to change based on some other data, it is tempting to overuse watch - especially if you are coming from an AngularJS background. Improve this answer. Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Destructuring assignment - JavaScript | MDN Introduction. The statement [a, b] = f () assigns the results of the function to the variables in brackets, in order: a is set to 1 and b is set to 2. live music ludington, mi Twitter. Computed Property Names in JavaScript - ui.dev In this tutorial we will check how use computed property names to create objects with property names that result from computing an expression, as the name implies. Dynamic object keys (computed property names) are awesome! The Mozilla docs is … how long can stink bugs live without air. YAY! javascript - What do square brackets around a property … What that means is that code that used to look like this, Both Shorthand Properties and Shorthand Method Names are just syntactic sugar over the previous ways we used to add properties to an object. I am not sure which version and I do not own a Mac myself to provide any more detail. JavaScriptのオブジェクトのキーを角カッコ[brackets]で囲う記法 …
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