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How to Set All Values of an Array with JavaScript?

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To set all values of an array with JavaScript, we can use the fill method

For instance, we can write:

const arr = [...Array(20)].fill(10)
console.log(arr)

We create an array with 20 empty slots with Array(20).

Then we spread that into a new array to create an array with 20 undefined entries.

Next, we call fill with 10 to replace will the undefined values with 10.

Therefore, arr is:

[10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10]

as a result.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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