https://leetcode.com/problems/remove-element/

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/**
 * @param {number[]} nums
 * @param {number} val
 * @return {number}
 */
var removeElement = function(nums, val) {
    for(let i = nums.length; i >= 0; i--) {
        if (nums[i] === val) {
            nums.splice(i, 1)
        }
    }
};