Find Smallest Letter Greater Than Target LeetCode solution in JavaScript

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/**
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 * @param {character[]} letters
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 * @param {character} target
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 * @return {character}
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 */
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var nextGreatestLetter = function (letters, target) {
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  let result = [];
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  for (letter of letters) {
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    if (letter > target) {
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      result.push(letter);
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    }
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  }
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  if (result.length) {
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    return result[0];
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  } else {
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    return letters[0];
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  }
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};