set element at index javascript array and create new array

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Sarah
26 Apr 2018
1arr.splice(index, 0, item);
2//explanation:
3inserts "item" at the specified "index",
4deleting 0 other items before it
source
Jemima
15 Jul 2019
1const items = [1, 2, 3, 4, 5]
2
3const insert = (arr, index, newItem) => [
4  // part of the array before the specified index
5  ...arr.slice(0, index),
6  // inserted item
7  newItem,
8  // part of the array after the specified index
9  ...arr.slice(index)
10]
11
12const result = insert(items, 1, 10)
13
14console.log(result)
15// [1, 10, 2, 3, 4, 5]
source
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