Minimum Moves to Convert String LeetCode solution in JavaScript

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var minimumMoves = function (s) {
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  let move = 0;
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  let i = 0;
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  while (i < s.length) {
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    let char = s[i];
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    // incrementing the index if we already have 'O'
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    if (char == "O") {
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      i++;
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    }
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    // incrementing the move and index by 3 (Per move = 3 characters)
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    if (char == "X") {
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      i = i + 3;
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      move++;
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    }
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  }
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  return move;
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};