Recent questions tagged ECMAScript

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ecmascript 6 - ES6 Maps and Sets: how are object keys indexed efficiently?

In ES6, Maps and Sets can use Objects as keys. However since the ES6 specification does not dictate the ... Any information will be appreciated! 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 - ES6: change a value while destructuring

Lets say I have an object const obj = { width: 100, height: 200 } I wish to pass that object to a method ... = localHeight - 50) } = obj 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 - Static Constructor in Javascript ES6

In ES6, I can create static methods like below. But I need to define a static constructor but no success. I need ... console.log("blabla"); } } 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 simulate let expressions in JavaScript?

Consider the following implementation of take: const take = (n, [x, ...xs]) => n === 0 || x === undefined ? [ ... (1, [undefined, 1])); // [] 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 5 - Where is the immutable binding record of the identifier in a named function expression stored in JavaScript?

Recently I ran into some interesting facts about named function expressions (NFE). I understand that the ... find much discussion online. See Question&Answers more detail:os...

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

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553 views

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ecmascript 6 - Javascript: Using `.includes` to find if an array of objects contains a specific object

I am a bit new to javascript ES6, and I am having difficulty understanding why the below is not functioning as ... true - returns false 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 does Javascript declare function parameters?

function func(x = y, y = 2) { return [x, y]; } func(); // ReferenceError: y is not defined func( ... and why this can run without an exception? 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 - Is the initial global execution context ever popped off the call stack in JavaScript?

Is the "initial global execution context" ever popped off the call stack in JavaScript? I am talking about the ... is pushed onto the stack? See Question&Answers more detail:os...

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

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593 views

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ecmascript 6 - Javascript object destructuring

Why is this not valid when using the new es6 destructuring syntax var a, b, c; {a, b, c } = {a:1, ... reason, I'm just trying to understand 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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ecmascript 6 - The effect of parenthesis with `this` binding in javascript

I encounter a very tricky case: class C { // class method are implicit in strict mode by default static method() ... of this in the above case? See Question&Answers more detail:os...

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

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577 views

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ecmascript 6 - How to build a single ES6 module from several TypeScript files (for a frontend library)

The code of my frontend library is split into several source files. Example: // a.ts function a() {} // b.ts ... there a better way to do that? See Question&Answers more detail:os...

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

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652 views

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ecmascript 6 - es6 import as a read only view understanding

There is no detalied explanation of what exactly es6 import and export do under the hood. Someone describe import ... does not know that. See Question&Answers more detail:os...

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

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672 views

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ecmascript 6 - D3.js v4: Access current DOM element in ES6 arrow function event listener

In D3.js v4, when registering an event listener through a traditional callback function, this references the current ... from an arrow function? See Question&Answers more detail:os...

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

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475 views

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ecmascript 6 - In JavaScript ES6, what is the difference between an iterable and iterator?

Is an iterable the same as an iterator, or are they different? It seems, from the specifications, an iterable ... the iterator. Is that correct? See Question&Answers more detail:os...

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

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440 views

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ecmascript 6 - In JavaScript ES6, what is the difference between an iterable and iterator?

Is an iterable the same as an iterator, or are they different? It seems, from the specifications, an iterable ... the iterator. Is that correct? See Question&Answers more detail:os...

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

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819 views

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ecmascript 6 - Use spread operator on NodeList in Typescript

I would like to use the ES6 spread operator to convert a NodeList to an Array. My project uses TypeScript and ... method like Object.keys()? See Question&Answers more detail:os...

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

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539 views

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ecmascript 5 - Is it possible to use ES5 JavaScript with Angular 2 instead of TypeScript?

Is it needed to learn TypeScript for Angular 2? Can Angular 2 be used with plain JavaScript ? Edit: I've ... to use ES5 JavaScript directly. See Question&Answers more detail:os...

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

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1.5k views

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ecmascript 6 - Eslint - `Parsing error: unexpected token =` error for assigned fat arrow / property initializer

I'm using an arrow function and it's complaining about a parsing error: Parsing Error: Unexpected token = ... this from a particular function. See Question&Answers more detail:os...

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

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517 views

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ecmascript 6 - Extending Array with ES6 classes

I have heard that ES6 now finally permits subclassing Array. Here's an example given by class Stack extends Array { ... or a limitation of 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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496 views

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ecmascript 6 - How to get the target of a JavaScript Proxy?

function createProxy() { const myArray = [Math.random(), Math.random()]; return new Proxy(myArray, {}); } const ... no way to get the target :( See Question&Answers more detail:os...

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

0 votes

539 views

1 answer

ecmascript 6 - Javascript: What's the difference between .call() and super()?

What's the difference between .call() and super()? Is super() just an es2015 thing? Or does .call() have more functionality? See Question&Answers more detail:os...

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

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1.0k views

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ecmascript 6 - How can I use my webpack's html-loader imports in Jest tests?

I am just getting started with the Jest test framework and while straight up unit tests work fine, I am having ... plain webpack, babel, 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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647 views

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ecmascript 6 - Does JavaScript have a Map literal notation?

As of ES6, JavaScript has a proper Map object. I don't see a way to use a literal notation though, as you could with ... bar: "Bar" }; Map: ??? See Question&Answers more detail:os...

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

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569 views

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ecmascript 6 - Does JavaScript have a Map literal notation?

As of ES6, JavaScript has a proper Map object. I don't see a way to use a literal notation though, as you could with ... bar: "Bar" }; Map: ??? See Question&Answers more detail:os...

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

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538 views

1 answer

ecmascript 6 - Is there a functional way to init an array in JavaScript ES6?

I finally gave up and wrote a for loop to initialize a simple array of objects where each object has an ... sampleData, isLoading: true }; See Question&Answers more detail:os...

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

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716 views

1 answer

ecmascript 6 - using the ... spread syntax in javascript es6 named exports

I am attempting to import everything from a library as a hash, modify it, and re-export the modified hash, ... statements must be top 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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450 views

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ecmascript 6 - Conditionally initializing a constant in Javascript

ES6 onwards we have const. This is not allowed: const x; //declare first //and then initialize it if( ... to conditionally create a constant? 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 5 - null vs. undefined and their behaviour in JavaScript

So after a big argument/debate/discussion on the implementation of null and undefined in javascript I'd like ... first, feel very inconsistent. See Question&Answers more detail:os...

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

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