Decrease Elements To Make Array Zigzag LeetCode solution in JavaScript

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var movesToMakeZigzag = function (nums) {
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  const n = nums.length;
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  let lastEvenRight = Number.MIN_SAFE_INTEGER;
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  let evenMoves = 0;
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  let lastOddRight = nums[0];
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  let oddMoves = 0;
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  for (let i = 0; i < n; i++) {
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    const currNum = nums[i];
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    const nextNum = i < n - 1 ? nums[i + 1] : Number.MIN_SAFE_INTEGER;
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    if (i % 2 === 0) {
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      if (lastEvenRight >= currNum) evenMoves += lastEvenRight - currNum + 1;
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      if (currNum <= nextNum) {
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        evenMoves += nextNum - currNum + 1;
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      }
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      lastEvenRight = Math.min(currNum - 1, nextNum);
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    } else {
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      if (lastOddRight >= currNum) oddMoves += lastOddRight - currNum + 1;
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      if (currNum <= nextNum) {
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        oddMoves += nextNum - currNum + 1;
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      }
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      lastOddRight = Math.min(currNum - 1, nextNum);
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    }
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  }
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  return Math.min(oddMoves, evenMoves);
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};