/sinatra/sinatra/pull/1059

sinatra-1059.rb

def a(unsafe)
  chars = unsafe.split(//).map! do |char|
    if char =~ /[A-Z]/
      char <<= char.tr('A-Z', 'a-z')
    end
    char
  end
end

def b(unsafe)
  chars = unsafe.split(//).map! do |char|
    char_dup = char.dup
    char_dup << (char.downcase! || '')
  end
end

def c(unsafe)
  chars = unsafe.split(//).map do |ch|
    ch == ch.downcase ? ch : ch + ch.downcase
  end
end

require 'benchmark'

SRC = 'A8iojJIWQjdkwjuiop*U(@!8mjoid21JJKLWJQEDdwqi91pj'.freeze
n = 20000
Benchmark.bm(10) do |x|
  x.report('sinatra')   { n.times { a(SRC); } }
  x.report('aidewoode') { n.times { b(SRC); } }
  x.report('condition') { n.times { c(SRC); } }
end

require 'minitest/autorun'

class CodeTest < Minitest::Test
  def test_result
    assert_equal a(SRC), c(SRC)
  end
end