benchmark with blocks

benchmark.rb

def benchmark
 starting_time = Time.now
 yield
 end_time = Time.now
 end_time - starting_time
end
 
# Be careful, pasting this into IRB will take a long time to print.
# It's a loooong string. :)
long_string = "apple"*100000000
 
running_time = benchmark{ long_string.reverse }
 
puts "string.reverse took #{running_time} seconds to run"