This will work:
Array.apply(null, Array(10)).map(…
Live demo: http://jsfiddle.net/xXG5p/
You have to make the array dense first. new Array(n) creates a sparse array. Sparse arrays do have a length but they have no elements. Hence, a .map() call will not iterate at all.
Using my code above, you will create a dense array that does contain elements (whose values are initially set to null).
