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.
