JavaScript - Flatten Array

gistfile1.txt

var flatten = function(array) {
  var results = [];
  
  for(var i = 0; i < array.length; i++) {
    if(Array.isArray(array[i])) {
      results = results.concat(flatten(array[i]));
    } else {
      results.push(array[i]);
    }  
  }
  return results;
};