JavaScript "Array" function with a numerical parameter

Question

Array(10) is used here to generate an array of numbers.

Array.from(Array(10).keys());

What is this function?: Array()

Where can I find documentation on it?

w3schools.com/js/js_arrays.asp

WorkaroundNewbie
– WorkaroundNewbie

2018-03-28 05:26:32 +00:00
Commented Mar 28, 2018 at 5:26 — WorkaroundNewbie
– WorkaroundNewbie, Commented Mar 28, 2018 at 5:26
It is same as new Array(). Doc

Tushar
– Tushar

2018-03-28 05:28:27 +00:00
Commented Mar 28, 2018 at 5:28 — Tushar
– Tushar, Commented Mar 28, 2018 at 5:28

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array#Syntax

new Array(arrayLength)

If the only argument passed to the Array constructor is an integer between 0 and 2³²-1 (inclusive), this returns a new JavaScript array with its length property set to that number (Note: this implies an array of arrayLength empty slots, not slots with actual undefined values). If the argument is any other number, a RangeError exception is thrown.

So Array.from(Array(n).keys()) is shorthand for "Create a new array of numbers 0 to n - 1".

edited Jun 20, 2020 at 9:12

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answered Mar 28, 2018 at 5:26

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