Question

var string = abc123;
string.split(*POSITION=3)???

Is there a way to split this string into an array of strings that is [abc,123]?
Is the split method the right thing to use?

Answer 1

I would say the split method is not the right thing to use here, as its purpose is to segment a string based on a certain character.

You could certainly write your own function, of course:

function partition(str, index) {
  return [str.substring(0, index), str.substring(index)];
}

// results in ["123", "abc"]
var parts = partition("123abc", 3);

If you wanted to write "123abc".partition(3) instead, you could make that possible by extending String.prototype:

String.prototype.partition = function(index) {
  return [this.substring(0, index), this.substring(index)];
};

Personally, though, I’d recommend avoiding that sort of tomfoolery (search the web for “extending built-in objects in JavaScript” if you want to read what others have to say on the topic).