Benchmarks two different ways to call methods that may or may not be defined

rescue_vs_respond_to.rb

require 'benchmark'

class Foo
  def bar
    1+1
  end
end

fmt = '%.2f'
count = 1000000
f = Foo.new

rescue_time = Benchmark.measure do 
  count.times do 
    begin
      f.send "_bar" 
    rescue NoMethodError
      f.bar
    end
  end 
end

respond_time = Benchmark.measure do 
  count.times do 
    unless f.respond_to? "_bar" 
      f.bar
    end
  end 
end

direct_time = Benchmark.measure { count.times { f.bar } }

puts "Showing results for #{count} method calls"
puts ""
puts "Method IS NOT defined"
puts "====================="
puts "With rescue:      #{fmt % rescue_time.real} seconds"
puts "With respond_to:  #{fmt % respond_time.real} seconds"
puts "Direct call:      #{fmt % direct_time.real} seconds"

rescue_time = Benchmark.measure do 
  count.times do 
    f.send "bar" 
  end 
end

respond_time = Benchmark.measure do 
  count.times do 
    if f.respond_to? "bar" 
      f.send "bar" 
    end
  end 
end

puts ""
puts "Method IS defined"
puts "================="
puts "With rescue:      #{fmt % rescue_time.real} seconds"
puts "With respond_to:  #{fmt % respond_time.real} seconds"
puts "Direct call:      #{fmt % direct_time.real} seconds"