message/block chaining

chain.rb

#ChronicDuration is just a random library that parses/outputs strings of time
#The meat of this the last expression/statement
%w{foo bar baz} # ["foo", "bar", "baz"]

ChronicDuration.parse("1:30") # 90

ChronicDuration.output(90) # "1:30"

class Object
  def pat(&block) # backwards of 1.9.2 method "tap" but arbitrary name
    block.call self
  end
end

[1,-2,-3].map(&:abs) # [1,2,3] converts symbol (a message) to a Proc (kind of like block)

(-5).pat(&:abs) # 5 # see above

%w{1:30 0:15}.
map(&ChronicDuration.method(:parse)).
reduce(&:+).
pat(&ChronicDuration.method(:output)) # 1:45

Code golfing: reduce doesn't require an ampersand.