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/**
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 * @param {character[]} chars
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 * @return {number}
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 */
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var compress = function (chars) {
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  if (!chars.length) return 0;
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  let j = 0;
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  let cur = chars[0];
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  let counter = 0;
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  for (let i = 0; i <= chars.length; i++) {
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    if (chars[i] === cur) {
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      counter++;
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    } else {
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      chars[j] = cur;
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      if (counter > 1) {
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        const s = counter.toString();
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        for (let k = 0; k < s.length; k++) chars[++j] = s[k];
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      }
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      j++;
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      cur = chars[i];
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      counter = 1;
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    }
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  }
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  return j;
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};