Length of Last Word LeetCode solution in JavaScript

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var lengthOfLastWord = function (s) {
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  s = s.split(" ");
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  if (s[s.length - 1] == ``) {
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    for (var i = s.length - 1; i >= 0; i--) {
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      if (s[i].length > 0) {
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        return s[i].length;
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      }
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    }
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  } else {
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    return s[s.length - 1].length;
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  }
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};