Recent questions tagged ECMAScript

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ecmascript 6 - Importing node modules from root directory using es6 and babel-node

I'm writing a node app with es6 using babel transpiler. I have 2 files index.js & my-module.js on my ... .babelrc config to support it? Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ecmascript 6 - How to omit specific properties from an object in JavaScript

Is there a clean way to return a new object that omits certain properties that the original object contains ... use something like lodash? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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661 views

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ecmascript 6 - Access Modifiers (Private, Protected) in ES6

Note: I already went through the below SO Question and 7 Answers (as of now) about Symbols, WeekMaps and Maps, ... Public Method } // end class See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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482 views

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ecmascript 6 - What is the most efficient way to copy some properties from an object in JavaScript?

Say, I have an object: const user = {_id: 1234, firstName: 'John', lastName: 'Smith'} I want to create ... there a better way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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347 views

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ecmascript 6 - How to make function parameter constant in JavaScript?

What I want to do is to use as many immutable variables as possible, thus reducing the number of moving parts in my ... a+'!'); } Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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588 views

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ecmascript 6 - ES6: Merge two arrays into an array of objects

I have two arrays that I want to merge together to one array of objects... The first array is of dates ( ... date: metrodates[index]}); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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542 views

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ecmascript 6 - Javascript Object destructuring and default parameters combined

Today I came across the following syntax which I didn't recognize: const createUser = ({ age = 1, name = ' ... 5 }); console.log(defaultP); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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505 views

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ecmascript 6 - Extending type when extending an ES6 class with a TypeScript decorator

I am trying to decorate a class with a decorator (a-la-angular style), and add methods and properties to it. ... completion, type safety, etc ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ecmascript 6 - In Javascript, when is it necessary to assign a named function to a variable?

In the online REPL of Babel JS (http://babeljs.io/repl/), when I type in : let a = (x) => x+1 ... to assign a named function to a variable? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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676 views

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ecmascript 6 - es6 import 'destructuring' not working

Hey there I have this uiTypes.js file like this: export default { SELECT_ITEM: 'SELECT_ITEM', DESELECT_ITEM: ' ... , Am I missing something? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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393 views

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ecmascript 6 - Extending Promises in ES6

I am trying to extend Promise: class PersistedPromise extends Promise { } Then call the static resolve on the ... by traceur and/or node? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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551 views

1 answer

ecmascript 6 - Babel error: Class constructor Foo cannot be invoked without 'new'

I am using babel to transpile. I have class BaseComponent which is extended by class Logger. When I run new Logger() ... n")); //throws here } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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372 views

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ecmascript 6 - How to use ES6 with PhantomJS

Is there a way to use ES6 and modules with PhantomJS? I can transpile each file from ES6 to ES5 using ... to use ES6 modules with PhantomJS? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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443 views

1 answer

ecmascript 6 - How do you get the key at specifc index in javascript map object?

Suppose I have the following map object const items = new Map([['item1','A'], ['item2','B'], ['item3', ... answer - Array.from(items.keys())[2] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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582 views

1 answer

ecmascript 6 - ES6 / ES7 support in Visual Studio 2015 Community

I'm hearing that VS 2015 is supporting the new js syntax but when I open up a project written using aurelia.js ... didn't mess up any settings. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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427 views

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ecmascript 6 - Are ES6 Array comprehensions no longer valid?

The ES6 code snippet below is invalid. It used to be valid. I can still run it in old versions of Traceur but ... people) { console.log(phone) } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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424 views

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ecmascript 6 - javascript es6 double arrow functions

I want to better understand es6 arrow functions. Given the following example: export default function applyMiddleware(. ... we see here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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376 views

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ecmascript 6 - How do you implement a "raceToSuccess" helper, given a list of promises?

I'm puzzled by something in the ES6 Promise API. I can see a clear use case for submitting multiple ... something at a philosophical level? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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647 views

1 answer

ecmascript 6 - (ES6) class (ES2017) async / await getter

Is it or will it be possible to have an ES6 class getter return a value from an ES2017 await / async function. ... foo.bar.should.equal('baz'); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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397 views

1 answer

ecmascript 6 - Difference between find() and filter().shift() on javascript

I recently starting to drop underscore/lodash overuse on (some of) my projects and realize that there's no full ... the polyfill instead? Why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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726 views

1 answer

ecmascript 6 - ES6 getter/setter with arrow function

I'm using babel6 and for my pet project I'm creating a wrapper for XMLHttpRequest, for the methods I can ... .xhr.status; Is this intentional? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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467 views

1 answer

ecmascript 6 - What's the difference between babel-preset-stage-0, babel-preset-stage-1 etc?

My question is : What's the difference between babel-preset-stage-0,babel-preset-stage-1,babel-preset-stage-2 and ... when we develop with ES6? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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491 views

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ecmascript 6 - Why was the name 'let' chosen for block-scoped variable declarations in JavaScript?

I understand why var takes that name - it is variable, const - it is a constant, but what is the meaning ... the current block? Let it be? See Question&Answers more detail:os...

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

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384 views

1 answer

ecmascript 6 - Typescript: How can I make entries in an ES6 Map based on an object key/value type

I would like to use Map instead of object map to declare some keys and values. But Typescript doesn't seem ... [Types.REMOVE, handleRemove] ]); See Question&Answers more detail:os...

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

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419 views

1 answer

ecmascript 5 - javascript "use strict" and Nick's find global function

So I saw a function that was, quite frankly beautiful in its simplicity as it allowed you to find the global object ... is in strict mode }()) See Question&Answers more detail:os...

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

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401 views

1 answer

ecmascript 6 - Dynamic imports in ES6 with runtime variables

Recently stumbled upon the dynamic import proposal and also this Youtube video . Thought would be a great idea to ... with a CodeSandbox link. See Question&Answers more detail:os...

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

0 votes

341 views

1 answer

ecmascript 6 - What is the exact parsing precedence of arrow function (fat arrow =>) in Javascript?

I came across an example from eslint documentation on arrow function: // The intent is not clear var x = a => 1 ... .log(x); console.log(a); See Question&Answers more detail:os...

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

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346 views

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ecmascript 6 - Add elements inside Array conditionally in JavaScript

When I try to merge two objects using the spread operator conditionally, it works when the condition is true or false: ... && arr1)]; // 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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