LeetCode: Missing Number Solution

1/**
2 * @param {number[]} nums
3 * @return {number}
4 */
5var missingNumber = function (nums) {
6 const n = Math.max.apply(null, [...nums, nums.length])
7 const currentSum = nums.reduce((acc, el) => acc + el, 0)
8 const expectedSum = (n * (n + 1)) / 2
9 return expectedSum - currentSum
10}

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leetcode

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