MajorityElement.js

/* Given an array nums of size n, return the majority element.

The majority element is the element that appears more than ⌊n / 2⌋ times. You may assume that the majority element always exists in the array.

Example 1:
Input: nums = [3,2,3]
Output: 3

Example 2:
Input: nums = [2,2,1,1,1,2,2]
Output: 2
*/

/**
 * @param {number[]} nums
 * @return {number}
 */
var majorityElement = function(nums) {
    let arrObj = {};

    nums.forEach(n => {
        if(arrObj[n]) {
            arrObj[n] += 1
        } else {
            arrObj[n] = 1
        }
    })

    let leastHighest = 0,
        result = null;

    for(let k in arrObj) {
        let val = arrObj[k];
        if(val > leastHighest) {
            leastHighest = val;
            result = k 
        }
    }
    
    return result
};