Missing Number | LeetCode 268

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Great resource I use to learn algorithms.
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Here is the full implementation.

/**
 * @param {number[]} nums
 * @return {number}
 */
let missingNumber = function(nums) {
    let sumIfNoneMissing = nums.length;
    let actualSum = 0;
        
    for (let i = 0; i < nums.length; i++){
        sumIfNoneMissing += i;
        actualSum += nums[i];
    }
    return sumIfNoneMissing - actualSum;
};