Count Words Obtained After Adding a Letter LeetCode solution in JavaScript

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var wordCount = function (startWords, targetWords) {
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  const startMap = {};
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  for (let word of startWords) {
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    startMap[word.split("").sort().join("")] = true;
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  }
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  let ans = 0;
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  for (let word of targetWords) {
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    for (let i = 0; i < word.length; i++) {
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      let temp = (word.substring(0, i) + word.substring(i + 1, word.length))
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        .split("")
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        .sort()
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        .join("");
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      if (startMap[temp]) {
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        ans++;
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        break;
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      }
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    }
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  }
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  return ans;
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};