Ruby 2.1 method return value use cases

gistfile1.rb

private def foo         # make one method private

instrumet def foo       # calculates execution time

silent def foo          # silences stdout/err output

cached def foo(args...) # caches each invokation with different arguments into redis

memoize def foo         # memoizes return value in instance variable

async def foo           # executes method in new thread and return thread object