pair of sum

gistfile1.txt

function hasPairOfSum(arr, sum){
   var flag;
   for(let i=0;i<arr.length;i++) {
      if (flag === arr[i]) { return true; }
      else if (arr[i] !== sum/2) { continue; }
      else if(!flag) { flag = arr[i]; }
   }
   return false;
}