Recent questions tagged ECMAScript

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ecmascript 6 - .map() a Javascript ES6 Map?

How would you do this? Instinctively, I want to do: var myMap = new Map([["thing1", 1], ["thing2", 2], ... here. Thanks! Docs for ES6 Map, FYI See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ecmascript 6 - Import JavaScript file and call functions using webpack, ES6, ReactJS

Trying to do something I would think would be very simple. I would like to import an existing JavaScript library ... _blah.blah is undefined". See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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479 views

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ecmascript 6 - How do I get Babel 6 to compile to ES5 javascript?

I've installed the latest version of babel. Currently 6.4.0. I create a file called myclass.js that has ... missing that may be causing this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ecmascript 6 - Destructuring Nested objects in javascript | Destructure second level parent and child Objects

I need to destructure and get values of title, child, childTitle from this object const obj1 = { title : 'foo' ... could I get the child object? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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616 views

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ecmascript 6 - JavaScript(ES6) WeakMap garbage collection when set an object to null

I've just read that WeakMaps take advantage of garbage collection by working exclusively with objects as keys, ... any clarification. Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ecmascript 6 - super keyword unexpected here

According to ES6 shorthand initialiser, following 2 methods are same: In ES5 var person = { name: "Person", greet: ... So, why do we get error? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ecmascript 6 - How to import two classes by the same name in javascript/es6?

I have these two import statements in file: import Data from 'component/Data.js'; import Data from 'actions/Data. ... can I avoid name clash? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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449 views

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ecmascript 6 - javascript import from '/folder' with index.js

I've noticed a few cases where I've seen something like the following: // /reducers/reducer1.js export ... "official" import/export support? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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531 views

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ecmascript 6 - Are JavaScript ES6 Classes of any use with asynchronous code bases?

What can ES6 Classes provide, as a pattern of organization, to asynchronous code. Below is an example with ... application they're useful for. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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476 views

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ecmascript 6 - Usage of rest parameter and spread operator in javascript

What's the usage of rest parameter that will be added in ECMAScript 6? For example, in ECMAScript 5 you ... syntax change or performance issue? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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521 views

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ecmascript 6 - forEach is not a function error with JavaScript array

I'm trying to make a simple loop: const parent = this.el.parentElement console.log(parent.children) parent.children ... Note: Here's a JSFiddle. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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353 views

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ecmascript 6 - this value in JavaScript anonymous function

Can anybody explain to me why A is true and B is false? I would have expected B to be true as well. function ... change } new MyObject().test(); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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406 views

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ecmascript 6 - Why is the response object from JavaScript fetch API a promise?

When requesting from a server with JavaScript fetch API, you have to do something like fetch(API) .then(response ... better ways to handle this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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519 views

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ecmascript 6 - Extending Error in Javascript with ES6 syntax & Babel

I am trying to extend Error with ES6 and Babel. It isn't working out. class MyError extends Error { constructor( ... (That is working in Babel) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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511 views

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ecmascript 6 - ReactJS with ES6: this.props is not a function when I communicate two components

I'm working with ReactJS with ES6, but I have some problems to communicate child > parent through ... docs/reusable-components.html#es6-classes See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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