eval vs send

eval_benchmark.rb

require 'benchmark'
require 'active_support/inflector'

class Foo
  def self.bar
  end
end

def with_eval
  eval "Foo.bar"
end

def with_meta
  (_class, _method) = "Foo.bar".split(".")
  _class.constantize.send(_method)
end


Benchmark.bmbm do |x|
  x.report("eval:") do
    10000.times { |i| with_eval }
  end
  x.report("meta:") do
    10000.times { |i| with_meta }
  end
end

result

$ ruby eval_benchmark.rb
Rehearsal -----------------------------------------
eval:   0.080000   0.000000   0.080000 (  0.085657)
meta:   0.030000   0.000000   0.030000 (  0.025313)
-------------------------------- total: 0.110000sec

            user     system      total        real
eval:   0.080000   0.000000   0.080000 (  0.079746)
meta:   0.020000   0.000000   0.020000 (  0.024821)