gistfile1.txt

# frozen_string_literal: true

require 'benchmark/ips'

class Key
  def a?
    true
  end

  def b?
    false
  end

  def c?
    true
  end

  def d?
    false
  end

  def e?
    true
  end
end

def parts
  @parts ||= {
    a: ->(x) { x.a? },
    b: ->(x) { x.b? },
    c: ->(x) { x.c? },
    d: ->(x) { x.d? },
    e: ->(x) { x.e? }
  }
end

def parts_methods
  @parts_methods ||= {
    a: 'a?',
    b: 'b?',
    c: 'c?',
    d: 'd?',
    e: 'e?'
  }
end

def each_key(key)
  str = +''
  parts.each do |k, v|
    str << "#{k}=#{v.call(key)}"
  end
  str
end

def compile_method
  method = +"def __compiled_key(key)\n  \""

  parts_methods.each do |k, v|
    method << "#{k}=#\{key.#{v}}"
  end
  method << "\"\nend"

  eval(method)
end

def string_key(key)
  "a=#{key.a?}b=#{key.b?}c=#{key.c?}d=#{key.d?}e=#{key.e?}"
end

compile_method

key = Key.new
orig = each_key(key)

if orig != string_key(key) || orig != __compiled_key(key)
  raise 'broken implementation'
end

Benchmark.ips do |x|
  x.report('string') do |times|
    i = 0
    while i < times
      string_key(key)
      i += 1
    end
  end

  x.report('each') do |times|
    i = 0
    while i < times
      each_key(key)
      i += 1
    end
  end

  x.report('compiled') do |times|
    i = 0
    while i < times
      __compiled_key(key)
      i += 1
    end
  end

  x.compare!
end

# Warming up --------------------------------------
#               string   134.918k i/100ms
#                 each    52.150k i/100ms
#             compiled   136.464k i/100ms
# Calculating -------------------------------------
#               string      1.639M (± 2.2%) i/s -      8.230M in   5.022614s
#                 each    562.231k (± 2.0%) i/s -      2.816M in   5.010807s
#             compiled      1.686M (± 2.0%) i/s -      8.461M in   5.019652s
# 
# Comparison:
#             compiled:  1686221.1 i/s
#               string:  1639373.0 i/s - same-ish: difference falls within error
#                 each:   562231.5 i/s - 3.00x  slower

perf.rb

# frozen_string_literal: true

require 'benchmark/ips'

class Key
  def a?
    true
  end

  def b?
    false
  end

  def c?
    true
  end

  def d?
    false
  end

  def e?
    true
  end
end

def parts
  @parts ||= {
    a: ->(x) { x.a? },
    b: ->(x) { x.b? },
    c: ->(x) { x.c? },
    d: ->(x) { x.d? },
    e: ->(x) { x.e? }
  }
end

def parts_methods
  @parts_methods ||= {
    a: 'a?',
    b: 'b?',
    c: 'c?',
    d: 'd?',
    e: 'e?'
  }
end

def each_key(key)
  str = +''
  parts.each do |k, v|
    str << "#{k}=#{v.call(key)}"
  end
  str
end

def compile_method
  method = +"def __compiled_key(key)\n  \""

  parts_methods.each do |k, v|
    method << "#{k}=#\{key.#{v}}"
  end
  method << "\"\nend"

  eval(method)
end

def string_key(key)
  "a=#{key.a?}b=#{key.b?}c=#{key.c?}d=#{key.d?}e=#{key.e?}"
end

compile_method

key = Key.new
orig = each_key(key)

if orig != string_key(key) || orig != __compiled_key(key)
  raise 'broken implementation'
end

Benchmark.ips do |x|
  x.report('string') do |times|
    i = 0
    while i < times
      string_key(key)
      i += 1
    end
  end

  x.report('each') do |times|
    i = 0
    while i < times
      each_key(key)
      i += 1
    end
  end

  x.report('compiled') do |times|
    i = 0
    while i < times
      __compiled_key(key)
      i += 1
    end
  end

  x.compare!
end

# Warming up --------------------------------------
#               string   134.918k i/100ms
#                 each    52.150k i/100ms
#             compiled   136.464k i/100ms
# Calculating -------------------------------------
#               string      1.639M (± 2.2%) i/s -      8.230M in   5.022614s
#                 each    562.231k (± 2.0%) i/s -      2.816M in   5.010807s
#             compiled      1.686M (± 2.0%) i/s -      8.461M in   5.019652s
# 
# Comparison:
#             compiled:  1686221.1 i/s
#               string:  1639373.0 i/s - same-ish: difference falls within error
#                 each:   562231.5 i/s - 3.00x  slower