Last Stone Weight LeetCode solution in JavaScript

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var lastStoneWeight = function (stones) {
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  let first = 0,
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    second = 0;
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  stones.sort((a, b) => a - b);
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  while (stones.length > 1) {
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    first = stones.pop();
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    second = stones.pop();
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    stones.push(first - second);
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    stones.sort((a, b) => a - b);
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  }
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  return stones[0];
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};