Create Target Array in the Given Order LeetCode solution in JavaScript

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/**
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 * @param {number[]} nums
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 * @param {number[]} index
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 * @return {number[]}
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 */
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var createTargetArray = function (nums, index) {
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  Array.prototype.insert = function (index, item) {
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    this.splice(index, 0, item);
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  };
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  let result = [];
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  for (let i = 0; i < nums.length; i++) {
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    result.insert(index[i], nums[i]);
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  }
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  return result;
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};