Find Triangular Sum of an Array LeetCode solution in JavaScript

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var triangularSum = function (nums) {
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  while (nums.length > 1) {
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    let arr = [];
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    for (let i = 0; i < nums.length - 1; i++) {
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      arr.push((nums[i] + nums[i + 1]) % 10);
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    }
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    nums = arr;
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  }
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  return nums[0];
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};