gistfile1.rb

def reverse(str)
  if str[0] and str[1]
    str[-1] + reverse(str[0..-2])
  else
    str
  end
end

def reverse_for(str)
  s = ''
  str.length.times do |i|
    s[i] = str[str.length - 1 - i]
  end
  s
end

puts 'some string to reverse please:'
x = 'juan david'

def bm(times = 100)
  start = Time.now
  times.times do
    yield
  end
  Time.now - start
end


puts "my reverse took #{ my = bm { reverse x} }"
puts "ruby reverse took #{ ruby_one = bm {x.reverse} }"
puts "reverse_for took #{ rev_f = bm {reverse_for x}}"
puts "\n"
puts "my / ruby = #{ my / ruby_one }"
puts "rev_f / ruby = #{ rev_f / ruby_one }"