Lets say we need to benchmark and evaluate the performance of code snippet. This is how we can easily do on Rails console using "Benchmark.ms" require 'benchmark' 1.9.3-p392 :001 > Benchmark.measure do 1.9.3-p392 :002 > "john mark McMillan".split(" ").collect{|word|word[0] = word[0].upcase; word}.join(" ") 1.9.3-p392 :003?> end => #<Benchmark::Tms:0x00007ff6cd8face8 @label="", @real=1.600012183189392e-05, @cstime=0.0, @cutime=0.0, @stime=2.9999999999960614e-06, @utime=1.8999999999991246e-05, @total=2.1999999999987307e-05 1.9.3-p392 :004 > Benchmark.