loop.js

var test = [1,2,3]

function check(arr){
 arr.forEach(function(el){
  if(el === 2){
   console.log('ouch')
   return true;
  }
 })
 return false;
}

function check1(arr){
  for(var i = 0; i < arr.length; i++){
    if(arr[i] === 2)return true;
  }
  return false;
}

check(test)  //ouch false
check1(test) // true

//one more layer needs to be return