027-Remove-Element.js

/**
 * https://leetcode.com/problems/remove-element/description/
 * Difficulty:Easy
 *
 * Given an array and a value, remove all instances of that value in-place and return the new length.
 * Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.
 * The order of elements can be changed. It doesn't matter what you leave beyond the new length.
 * Example:
 * Given nums = [3,2,2,3], val = 3,
 * Your function should return length = 2, with the first two elements of nums being 2.
 */

/**
 * @param {number[]} nums
 * @param {number} val
 * @return {number}
 */
var removeElement = function (nums, val) {

    var len = nums.length;
    for (var i = 0; i < len; i++) {
        if (nums[i] === val) {
            nums.splice(i, 1);
            i--;
            len--;
        }
    }
    return len;
};

console.log(removeElement([3, 2, 2, 3], 3));