LeetCode: Create Target Array In The Given Order Solution

1var createTargetArray = function (nums, index) {
2 const N = nums.length
3 let res = Array(N).fill(null)
4 for (let i = 0; i < N; i++) {
5 if (res[index[i]] == null) {
6 res[index[i]] = nums[i]
7 } else {
8 res = [res.slice(0, index[i]), nums[i], res.slice(index[i])].flat()
9 }
10 }
11 return res.filter(x => x !== null)


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