ECMAScript 6 spread operator

spread.js

/* See:
   http://bit.ly/WhXvb3
   for the Traceur */

var foo = [9, 9, 9],
    bar = [2, 2, 2],
    baz = [1, 1, ...foo, 1, 1, ...bar, 1, 1];

console.log(baz);
/* Output: 1,1,9,9,9,1,1,2,2,2,1,1 */



/* This is similar to Clojure's
   unquote-expand operator:

(let [foo [9 9 9]
      bar [2 2 2]
      baz `[1 1 ~@foo 1 1 ~@bar 1 1]]
  (println baz))
*/