Ruby example added to description.

In fact, you don't even need it for this particular method. #select will work directly on the Range object.

A small tip - it may look less natural but it is worth using equals the oposite way to avoid NullPointerException:
"John Smith".equals(name).

Your are calculating the same thing multiple times and it could be made just once: word.chars.sort.join .

Ruby version lacks an example output.

In ruby version of this kata the first test is incorrect:

Test.assert_equals(song_decoder("ABWUBWUBC"), "A B C","WUB should be replaced by 1 space");

A and B cannot be recognized as separate words. Correct output for ABWUBWUBC should be AB C, but considering this test's comment it should probably look like this:

Test.assert_equals(song_decoder("AWUBBWUBC"), "A B C","WUB should be replaced by 1 space");

Notice WUB between each word in AWUBBWUBC.

perfect! Thanks!

I guess to_a makes your solution use a lot of memory (for big numbers), which is unneeded.