raise_or_if.rb

require 'bundler/inline'
gemfile do
  source 'https://rubygems.org'

  gem 'benchmark-ips'
end

require 'benchmark/ips'

Benchmark.ips do |x|
  puts "Ruby: #{RUBY_VERSION}"

  x.report('raise') {
    begin
      "a".not_exists_method
      result = 'exists'
    rescue
      result = 'not exists'
    end
  }

  x.report('respond_to') {
    begin
      if "a".respond_to? :not_exists_method
        result = 'exists'
      else
        result = 'not exists'
      end
    rescue
      result = 'not exists'
    end
  }

  x.compare!
end

__END__

Ruby: 3.1.2
Warming up --------------------------------------
               raise    88.271k i/100ms
          respond_to   862.317k i/100ms
Calculating -------------------------------------
               raise    890.704k (± 4.9%) i/s -      4.502M in   5.066936s
          respond_to      8.591M (± 4.7%) i/s -     43.116M in   5.030365s

Comparison:
          respond_to:  8591086.5 i/s
               raise:   890704.1 i/s - 9.65x  (± 0.00) slower