Nesting array.some() in javascript

Question

I'm wondering about nested uses of Array.some(). Suppose the task is to determine whether three numbers in an array sum to a given value x. I tried the following, but it did not work:

return myArray.some(function(num1){
    myArray.some(function(num2){
       myArray.some(function(num3){
           return num1 + num2 + num3 === x;
       });
    });
 });

Any insight on this would be helpful, including why the above doesn't work.

Answer 1

You should return the response of each nested myArray.some otherwise, the enclosing method will receive an undefined.

See the code below.

var myArray = [1, 3, 7, 21];
var x = 31;

var opt = myArray.some(function(num1) {
  return myArray.some(function(num2) {
    return myArray.some(function(num3) {
      return num1 + num2 + num3 === x;
    });
  });
});

console.log(opt);