Breakdown of indexOf function

Question

Can someone explain this solution to me? A friend helped me, but he just wrote it all out and didn't explain it. Now, I'm really confused :(

_.indexOf = function(array, target){
    var result = -1;
    _.each(array, function(item, index) {
  if (item === target && result === -1) {
    result = index;
  }
});

return result;

};

return result;

};

Sounds like your friend is a real jerk. Other than writing that for you. Does it work? — DigitalNinja, Jul 24 '15 at 19:30
what is the underscore referring to? This is Javascript, correct? — dramzy, Jul 24 '15 at 19:34
What "solution" are you referring to? Do you understand what the problem is? — Bergi, Aug 05 '15 at 07:35

score 0 · Answer 1 · answered Jul 24 '15 at 19:39

The function traverses through all the elements of the array and returns index of the first element that is equal to target. The code could also look like this:

_.indexOf = function(array, target){
    var result = -1;
    _.each(array, function(item, index) {
        if (item === target) {
            result = index;
            return false;
        }
    });
    return result;
}

Breakdown of indexOf function

1 Answers1