Leetcode - 1. Two Sum

const twoSum = function(nums, target){
  let numsObj = {}
  for(let i=0;i<nums.length;i++){
    let gap = target-nums[i]
    if(numsObj[gap]!==undefined){
      return [numsObj[gap],i]
    }
    numsObj[nums[i]]=i;
  }
}

nums = [2,3,5,6,8,9]
target =11
console.log(twoSum(nums,target));