[rcb]

If you're looking for more elegant methods of expressing this in a higher performance runtime, here are two examples.

Erlang: [I+9 || I <- lists:seq(1,5), I >= 3] Haskell: [i+9 | i <- [1..5], i >= 3]

Like go, both Erlang and Haskell both have strong concurrency stories. For an I/O bound server in a production environment, Erlang is a very safe choice.

Compared to these list comprehensions, that ruby example looks unwieldy.

[jasongrout]

Even python looks more readable to me: [i+9 for i in range(1,6) if i>=3]