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

Try the below code:

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

For nth position:

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

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/

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

As you have asked (om 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;
}

splitNChars("foofaafoofaafoofaafoofaafoofaa",3);

JSFiddle Demo

You can do like this:

var input = "foofaafoofaafoofaafoofaafoofaa";

var result = [];
while (input.length) {
    result.push(input.substr(0, 3));
    input = input.substr(3);
}

Demo: http://jsfiddle.net/Guffa/yAZJ2/

As Mark Walter has pointed out, this solution from another Stack Overflow question works perfectly:

function splitStringAtInterval (string, interval) {
  var result = [];
  for (var i=0; i<string.length; i+=interval)
    result.push(string.substring (i, i+interval));
  return result;
}

The function followed by an example using it. The example test outputs: ["abc","def","ghi","j"]

function splitEvery(str, n)
{
    var arr = new Array;
    for (var i = 0; i < str.length; i += n)
    {
        arr.push(str.substr(i, n));
    }
    return arr;
}

var result = splitEvery('abcdefghij', 3);
document.write(JSON.stringify(result));