Two Sum

twoSum.md

function twoSum(arr, target) {
  return arr.reduce((pairs, val, indx, srcArr) => {
    let remainder = target - val;
    let indx2 = srcArr.indexOf(remainder);
    return indx2 !== -1 ? [...pairs, [val, remainder]] : pairs;
  }, []);
}

const numArray = [1, 6, 4, 5, 3, 3];
const sum = 7;

console.log(twoSum(numArray, sum));