Dota2 Senate LeetCode solution in JavaScript

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var predictPartyVictory = function (senate) {
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  let index = 0,
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    RCount = 0,
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    DCount = 0,
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    deletion = false,
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    delCount = 1;
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  while (delCount || index < senate.length) {
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    if (index >= senate.length) {
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      index = 0;
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      delCount = 0;
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    }
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    deletion = false;
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    if (senate.charAt(index) == "R") {
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      if (DCount > 0) {
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        senate = senate.slice(0, index) + senate.slice(index + 1);
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        DCount--;
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        index--;
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        deletion = true;
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        delCount++;
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      } else {
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        RCount++;
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      }
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    } else if (senate.charAt(index) == "D") {
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      if (RCount > 0) {
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        senate = senate.slice(0, index) + senate.slice(index + 1);
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        RCount--;
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        index--;
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        deletion = true;
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        delCount++;
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      } else {
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        DCount++;
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      }
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    }
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    if (index == senate.length - 1) {
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      if (
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        senate.charAt(0) == "R" &&
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        senate.charAt(index) == "D" &&
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        DCount > 0 &&
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        !deletion
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      ) {
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        senate = senate.slice(1);
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        DCount--;
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        index = -1;
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      } else if (
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        senate.charAt(0) == "D" &&
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        senate.charAt(index) == "R" &&
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        RCount > 0 &&
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        !deletion
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      ) {
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        senate = senate.slice(1);
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        RCount--;
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        index = -1;
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      }
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    }
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    index++;
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  }
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  return senate.charAt(0) == "D" ? "Dire" : "Radiant";
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};