How to update only the given index of 2d array in javascript?

user_4475173 0
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I created a 2d array using Array constructor and filling it with a array inside it.

const a = new Array(26).fill(new Array(2).fill(-1));

When i try to do this a[0][0] = 0 the 0th index of all 26 arrays have changed. How do I prevent that?

const a = new Array(26).fill(new Array(2).fill(-1));
a[0][0] = 0

console.log(a)

arrays javascript
1 Answers

Try this:

const a = [...Array(26)].map(() => new Array(2).fill(-1))
a[0][0] = 0

console.log(a)

user_19325520
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