From: "Bartosz Dziewoński" <matma.rex@...>
Date: 2012-02-12T22:14:36+09:00
Subject: Re: the ruby syntax

When a hash is the last argument to a method, you can skip its open-
and close-braces.

So this:
IO.new("data.txt", mode: 'w:UTF-16LE', cr_newline: true)
Is the same as this:
IO.new("data.txt", {mode: 'w:UTF-16LE', cr_newline: true})

The first argument is the "data.txt" string, the second argument is
the entire hash. The method then checks the type of second argument,
and in this case - since it's a hash - it considers it to be the opt
variable, with mode taking default value.

-- Matma Rex