JavaScript Random Colour/Color Generator (Hex values)

rand_hex_col_gen.js

var rand_hex_col_gen = function(){

  // do the numbers first
  var options = [];
  for(var i=0; i<10; i++){
    options.push(i.toString());
  };
  
  // add letters
  options = [].concat.apply(options, ["a", "b", "c", "d", "e", "f"]);
  
  // loop through till you get a col
  var chosen_col = "#";
  while(chosen_col.length < 7){
    chosen_col += options[Math.floor(Math.random() * options.length)]
  };
  
  // return the final value
  return chosen_col;
};