Merge Similar Items LeetCode solution in JavaScript

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/**
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 * @param {number[][]} items1
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 * @param {number[][]} items2
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 * @return {number[][]}
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 */
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var mergeSimilarItems = function (items1, items2) {
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  let map = new Map();
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  items1.reduce(
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    (map, curr) => map.set(curr[0], map.get(curr[0]) + curr[1] || curr[1]),
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    map
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  );
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  items2.reduce(
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    (map, curr) => map.set(curr[0], map.get(curr[0]) + curr[1] || curr[1]),
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    map
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  );
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  return [...map].sort((a, b) => {
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    return a[0] - b[0];
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  });
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};