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/**
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 * @param {number[]} arr1
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 * @param {number[]} arr2
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 * @return {number[]}
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 */
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var relativeSortArray = function (arr1, arr2) {
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  const indices = new Map();
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  arr2.forEach(indices.set, indices);
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  return arr1.sort((a, b) => {
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    if (indices.has(a)) {
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      return indices.has(b) ? indices.get(a) - indices.get(b) : -1;
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    }
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    if (indices.has(b)) {
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      return 1;
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    }
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    return a - b;
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  });
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};