Named arguments with defaults
# length is required
def pad(num, length:, char: "0")
num.to_s.rjust(length, char)
end
pad(42, length: 6) #=> "000042"
pad(42) #=> #<ArgumentError: missing keyword: length>
Module.prepend
prepend(Module.new do
define_method ...
end)
References
- http://globaldev.co.uk/2013/03/ruby-2-0-0-in-detail
- http://globaldev.co.uk/2014/05/ruby-2-1-in-detail