Merge Strings Alternately LeetCode solution in JavaScript

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/**
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 * @param {string} word1
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 * @param {string} word2
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 * @return {string}
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 */
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var mergeAlternately = function (word1, word2) {
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  let length = Math.max(word1.length, word2.length),
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    s = "";
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  for (let i = 0; i < length; i++) {
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    s += word1[i] || "";
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    s += word2[i] || "";
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  }
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  return s;
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};