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## a simple wrapper for Benchmark.bm require 'benchmark' def compare(times = 1, label_width = 12) Benchmark.bm(label_width) do |x| yield Benchmark::ReportProxy.new(x, times) end end class Benchmark::ReportProxy def initialize(bm, iterations) @bm = bm @iterations = iterations end def method_missing(method, *args, &block) args.unshift(method.to_s + ':') @bm.report(*args) do @iterations.times { block.call } end end end ## usage compare 100_000 do |try| first, last = %w(Mislav Marohnic) try.join { [first, last].join(' ') } try.interpolation { "#{first} #{last}" } try.concatenation { first + ' ' + last } end ## output [plaintext] user system total real join: 0.520000 0.070000 0.590000 ( 0.693261) interpolation: 0.490000 0.060000 0.550000 ( 0.631762) concatenation: 0.540000 0.060000 0.600000 ( 0.678998)