1
/**
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 * @param {number[]} nums
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 * @return {number[]}
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 */
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var productExceptSelf = function (nums) {
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  let result = [];
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  let len = nums.length;
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  let prefix = 1;
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  for (let i = 0; i < len; i++) {
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    result[i] = prefix;
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    prefix *= nums[i];
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  }
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  let postfix = 1;
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  for (let i = len - 1; i >= 0; i--) {
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    result[i] *= postfix;
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    postfix *= nums[i];
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  }
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  return result;
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};