4.5

// Your code here.
function every(array,predicate){
  for(var i = 0; i<array.length; i++){
    if (!predicate(array[i]))
    return false;
	}
  return true;
}

function some(array,predicate){
  for(var i = 0; i<array.length; i++){
    if (predicate(array[i]))
    return true;
    }
  return false;
}
console.log(every([NaN, NaN, NaN], isNaN));
// → true
console.log(every([NaN, NaN, 4], isNaN));
// → false
console.log(some([NaN, 3, 4], isNaN));
// → true
console.log(some([2, 3, 4], isNaN));
// → false