Recent questions tagged ecmascript

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ecmascript 6 - How can I alias a default import in JavaScript?

Using ES6 modules, I know I can alias a named import: import { foo as bar } from 'my-module'; And I know ... or can I?) alias a default import? 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 - JavaScript object destructuring and aliasing

Is there a way to destructure an object in JavaScript and alias the local destructured object? Something ... more ECMAScript 6 functionality. 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 - Javascript ES6 export const vs export let

Let's say I have a variable that I want to export. What's the difference between export const a = 1; ... export them, what are the differences? See Question&Answers more detail:os...

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

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810 views

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ecmascript 6 - What is the use case for var in ES6?

If the let keyword introduces a proper implementation of block scope, does var any longer have a use case? I ... "well you could" standpoint. See Question&Answers more detail:os...

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

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869 views

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ecmascript 5 - Extending Object.prototype JavaScript

I am not asking if this is okay: Object.prototype.method = function(){}; This is deemed evil by pretty much ... the feature in the first place? See Question&Answers more detail:os...

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

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949 views

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ecmascript 6 - Transforming a Javascript iterable into an array

I'm trying to use the new Map object from Javascript EC6, since it's already supported in the latest Firefox ... but its dependency on traceur puts me off... Question&Answers:os...

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

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948 views

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ecmascript 6 - What does @@ ("at at") mean in ES6 JavaScript?

I've noticed @@ used in a few pages about new ES6 features, but I don't know what exactly it means (whether it ... it's hard to google. Can someone explain it? Question&Answers:os...

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

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ecmascript 6 - ES6 - Convert from 'require' to 'import'

If the alternative to: var Foo = require('foo'); is: import Foo from 'foo'; What is the alternative to: var Bar ... batz Could it be: import {batz} from 'foo' ? Question&Answers:os...

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

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ecmascript 6 - Does Jest support ES6 import/export?

If I use import/export from ES6 then all my Jest tests fail with error: Unexpected reserved word I convert my object ... -legacy"] } Is there a fix for this? Question&Answers:os...

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

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933 views

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ecmascript 6 - Destructuring to get the last element of an array in es6

In coffeescript this is straightforward: coffee> a = ['a', 'b', 'program'] [ 'a', 'b', 'program' ] ... the splat only be the last thing in the destructuring? Question&Answers:os...

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

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800 views

1 answer

ecmascript 6 - Javascript ES6 cross-browser detection

How can I find out the browser's Javascript engine version and support to ECMAScript 6? I'm using navigator. ... s version, but not the engine's version. Question&Answers:os...

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

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1.1k views

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ecmascript 6 - How can I clone a JavaScript object except for one key?

I have a flat JS object: {a: 1, b: 2, c: 3, ..., z:26} I want to clone the object except for one ... way to do this (preferring to use es6/7 if possible)? Question&Answers:os...

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

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907 views

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ecmascript 6 - Scope of Default function parameters in javascript

I'm playing with some EcmaScript 2015 features and I must say that specification is rather hard to ... place in specification which could clarify this? Question&Answers:os...

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

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965 views

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ecmascript 6 - What does arrow function '() => {}' mean in Javascript?

This question already has answers here: Question&Answers:os...

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

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892 views

1 answer

ecmascript 6 - Babel 6 changes how it exports default

Before, babel would add the line module.exports = exports["default"]. It no longer does this. What this ... Modules, Upgrading Babel, Tears, and a Solution Question&Answers:os...

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

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972 views

1 answer

ecmascript 6 - Is it possible to destructure onto an existing object? (Javascript ES6)

For example if I have two objects: var foo = { x: "bar", y: "baz" } and var oof = {} and I ... es6 destructuring syntax? perhaps something like: oof{x,y} = foo Question&Answers:os...

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

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813 views

1 answer

ecmascript 6 - using brackets with javascript import syntax

I came across a javascript library that uses the following syntax to import libraries: import React, { Component, ... React, Component, PropTypes from 'react'; Question&Answers:os...

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

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933 views

1 answer

ecmascript 6 - How do I merge two javascript objects together in ES6+?

I'm sick & tired of always having to write code like this: function shallowExtend(obj1,obj2){ var key; for ... planned? If not planned, then why not? Question&Answers:os...

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

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932 views

1 answer

ecmascript 6 - javascript es6 array feature [...data, 0] "spread operator"

I came across this in some example code and I am completely lost. const addCounter = (list) => { ... } Any suggestion or explaination is much appreciated. Question&Answers:os...

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

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1.2k views

1 answer

ecmascript harmony - JavaScript double colon (bind operator)

As you know, there is a proposal for a shortcut for .bind() function, so you can write: ::this.handleStuff and ... so it would be nice to shorten it a little. Question&Answers:os...

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

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805 views

1 answer

ecmascript 5 - Creating range in JavaScript - strange syntax

I've run into the following code in the es-discuss mailing list: Array.apply(null, { length: 5 }).map(Number ... the result of the code? What's happening here? Question&Answers:os...

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

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806 views

1 answer

ecmascript 6 - Are ES6 classes just syntactic sugar for the prototypal pattern in Javascript?

After playing with ES6, I've really started to like the new syntax and features available, but I do have a ... prototype.doStuff = function() {}; // etc Question&Answers:os...

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

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1.4k views

1 answer

ecmascript 6 - ReactJS giving error Uncaught TypeError: Super expression must either be null or a function, not undefined

I am using ReactJS. When I run the code below the browser says: Uncaught TypeError: Super expression must ... saves someone else three days of precious life. Question&Answers:os...

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

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857 views

1 answer

ecmascript 6 - Square Brackets Javascript Object Key

Can anyone explain how the why/how the below method of assigning keys in JavaScript works? a = "b" c = {[a]: "d"} return: Object {b: "d"} Question&Answers:os...

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

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911 views

1 answer

ecmascript 5 - how to stop Javascript forEach?

This question already has answers here: Question&Answers:os...

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

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1.0k views

1 answer

ecmascript 6 - Why can I change a constant object in javascript

I know that ES6 is not standardized yet, but a lot of browsers currently support const keyword in JS. In spec, it ... ? I tried it in the latest chrome and FF29 Question&Answers:os...

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

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847 views

1 answer

ecmascript 6 - Where can I get info on the object parameter syntax for JavaScript functions?

If I want to call a function like this: moo({ a: 4 }); Normally I'd have to phrase my function definition like this ... (a); // prints 4 } What is this feature? Question&Answers:os...

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

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906 views

1 answer

ecmascript 6 - Javascript object literal: what exactly is {a, b, c}?

The question I have is best given by way of this jsfiddle, the code for which is below: var a = 1, b = 'x ... data structure is f? Is it just a shorthand for d? Question&Answers:os...

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

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