javascript - Arrow function with Square Brackets? - Stack Overflow

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I am working on some code, and I have stumbled across something I am unfamiliar with.

export const doSomething = () => [ someFunction(), bind(stuff, stuff, stuff) ]; 

I have never seen an arrow function with a square bracket like that, has anyone else? If so what is the meaning of how it works?

I am working on some code, and I have stumbled across something I am unfamiliar with.

export const doSomething = () => [ someFunction(), bind(stuff, stuff, stuff) ]; 

I have never seen an arrow function with a square bracket like that, has anyone else? If so what is the meaning of how it works?

• javascript
• ecmascript-6
• arrow-functions

Share Improve this question Follow edited Nov 4, 2019 at 21:45 Emile Bergeron 17.4k55 gold badges8585 silver badges131131 bronze badges asked Nov 4, 2019 at 21:36 chrischris 37k5353 gold badges147147 silver badges256256 bronze badges 1

• 1 Doesn't it just return an array? – VLAZ Commented Nov 4, 2019 at 21:37

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 8

This code means that your function doSomething returns an array when

[0] element - the result of execution of function someFunction() and

[1] element - the result of execution of function bind(stuff, stuff, stuff).

This is a shortcut for:

export const doSomething = () => {
    return [ someFunction(), bind(stuff, stuff, stuff) ]
}; 

But be careful if you want to make a shortcut for returning objects. You have to wrap objects in parentheses (), like this:

export const doSomething = () => ({ name: 'John' }).

It's just returning an array.

You might use it with a destructuring assign e.g.

const [someResult, boundStuff] = doSomething()

Or just like any old function e.g.

const something = doSomething()

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