1
/**
2
 * @param {number[]} nums
3
 * @param {number[][]} operations
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 * @return {number[]}
5
 */
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var arrayChange = function (nums, operations) {
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  let map = new Map();
8

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  for (let i = 0; i < nums.length; i++) {
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    let num = nums[i];
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    map.set(num, i);
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  }
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  for (let op of operations) {
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    let key = op[0];
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    let value = op[1];
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    // if key exists
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    if (map.has(key)) {
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      const idx = map.get(key);
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      map.set(value, idx);
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      map.delete(key);
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    }
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  }
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  for (let [key, idx] of map) {
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    nums[idx] = key;
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  }
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  return nums;
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};