ecmascript-6 Archives - Page 8 of 9

What’s the difference between “super()” and “super(props)” in React when using es6 classes?

When is it important to pass props to super(), and why? class MyComponent extends React.Component { constructor(props) { super(); // or super(props) ? ...

April 29, 2022
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What do multiple arrow functions mean in JavaScript?

I have been reading a bunch of React code and I see stuff like this that I don’t understand: handleChange = field => ...

April 28, 2022
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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 I ...

April 28, 2022
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“Uncaught SyntaxError: Cannot use import statement outside a module” when importing ECMAScript 6

I’m using ArcGIS JSAPI 4.12 and wish to use Spatial Illusions to draw military symbols on a map. When I add milsymbol.js to ...

April 28, 2022
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Are ‘Arrow Functions’ and ‘Functions’ equivalent / interchangeable?

Arrow functions in ES2015 provide a more concise syntax. Can I replace all my function declarations / expressions with arrow functions now? What ...

April 27, 2022
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Call async/await functions in parallel

As far as I understand, in ES7/ES2016 putting multiple await‘s in code will work similar to chaining .then() with promises, meaning that they ...

April 26, 2022
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ECMAScript 6 arrow function that returns an object

When returning an object from an arrow function, it seems that it is necessary to use an extra set of {} and a ...

April 22, 2022
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What is “export default” in JavaScript?

File: SafeString.js // Build out our basic SafeString type function SafeString(string) { this.string = string; } SafeString.prototype.toString = function() { return "" + ...

April 22, 2022
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When should I use curly braces for ES6 import?

It seems to be obvious, but I found myself a bit confused about when to use curly braces for importing a single module ...

April 15, 2022
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Using Node.js require vs. ES6 import/export

In a project I am collaborating on, we have two choices on which module system we can use: Importing modules using require, and ...

April 14, 2022
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