how to flatten array in javascript using foreach loop

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Pia
15 Jun 2019
1function flatten(arr) {
2  const result = []
3
4  arr.forEach((i) => {
5    if (Array.isArray(i)) {
6      result.push(...flatten(i))
7    } else {
8      result.push(i)
9    }
10  })
11  
12  return result
13}
14
15// Usage
16const nested = [1, 2, 3, [4, 5, [6, 7], 8, 9]]
17
18flatten(nested) // [1, 2, 3, 4, 5, 6, 7, 8, 9]
19
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