Split a string, at every nth position, with JavaScript? [duplicate]

Question

I have the following string:

foofaafoofaafoofaafoofaafoofaa

An array with 10 rows (if I split by every 3rd character, that is), which looks something like this, if I were to instantiate it:

var fooarray = new Array ('foo', 'faa', 'foo', 'faa', 'foo', 'faa', 'foo', 'faa', 'foo', 'faa');

So I want a function, either built-in or custom-made, which can help me split up a string by every nth character.

Answer 1

Try the below code:

var foo = "foofaafoofaafoofaafoofaafoofaa";
console.log( foo.match(/.{1,3}/g) );

For nth position:

foo.match(new RegExp('.{1,' + n + '}', 'g'));

Answer 2

var s = "foofaafoofaafoofaafoofaafoofaa";
var a = [];
var i = 3;

do{ a.push(s.substring(0, i)) } 
while( (s = s.substring(i, s.length)) != "" );

console.log( a )

Prints:

foo,faa,foo,faa,foo,faa,foo,faa,foo,faa

Working demo: http://jsfiddle.net/9RXTW/

Answer 3

As I was writing this, @xdazz came up with the wonderfully simple regex solution.

But as you have asked (on the comments to that answer) for a non-regex solution, I will submit this anyway...

function splitNChars(txt, num) {
  var result = [];
  for (var i = 0; i < txt.length; i += num) {
    result.push(txt.substr(i, num));
  }
  return result;
}
console.log(splitNChars("foofaafoofaafoofaafoofaafoofaa",3));