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Leetcode - 136. Single Number

· One min read

https://leetcode.com/problems/single-number/

Solution 1​

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

  for (let i = 0; i < nums.length; i++) {
    const currentNum = nums[i];
    if (hashMap[currentNum]) {
      hashMap[currentNum]++;
    } else {
      hashMap[currentNum] = 1;
    }
  }

  return Number(getKeybyValue(hashMap, 1));
};

const getKeybyValue = (object, value) => {
  return Object.keys(object).find((key) => object[key] === value);
};