javascript_2sum_1.js

const twoSum = (dataSet, target) => {
   const nums = {}
   // Can also use Map() and will work the same
   // const nums = new Map()
	
   for (const num of dataSet) {
      const potentialMatch = target - num
      console.log(nums)
      if(potentialMatch in nums) {
        return [potentialMatch, num] // found match so return current num + potentialMatch
      } else {
         nums[num] = true // add to hash
	}
   }
   return []
}

const dataSet = [1,5,22,9,25,2]
const target = 11

const results = twoSum(dataSet, target)
console.log('Results .... ', results)