Find Pair of Numbers equal to the specified sum using javascript IIFY

((a,requiredSum) => {
let i=0;
let j=a.length-1;
while(i<=j){
 if(a[i]+a[j]<requiredSum){
  i++;
 }
 else{
   if(a[i]+a[j] == requiredSum){console.log(a[i]+','+a[j])}
  j--
 }
}
})([11,18,21,28,31,38,40,55,60,62],66);