Benchmark to show explicit returns are slower than implicit returns.

gistfile1.rb

#!/usr/bin/env ruby
# Benchmark explicit vs implicit returns.
#
# In a loop doing 5,000,000 implicit and the same explicit returns,
# The following stats came back:
#
#       user     system      total        real
# explicit return  2.040000   0.010000   2.050000 (  2.074879)
# implicit return  1.310000   0.010000   1.320000 (  1.333344)
#
# So, besides using less code, implicit returns are actually quite a bit
# faster than explicit returns.

require 'benchmark'

class Return
  def implicit
    1
  end
  def explicit
    return 1
  end
end

Benchmark.bm do |x|
  r = Return.new
  n = 5_000_000
  x.report('explicit return' ) { n.times { r.explicit } }
  x.report('implicit return' ) { n.times { r.implicit } }
end