LeetCode 1: Two Sum

/**
  * @param {number[]} nums
  * @param {number} target
  * @return {number[]}
  */
var twoSum   =  function (nums ,target ) {
    const numsToFind   =  {};

    for (let i = 0; i<nums.length; i++ ) {
        const numToFind   = nums [i ];
        if  (numsToFind [numToFind ]   >=  0 ) {
            return  [i ,numsToFind [numToFind ]];
        }
       numsToFind [target   - numToFind ]  = i ;
    }
};