gistfile1.rb

require 'benchmark'

n = 20000
Benchmark.bm do |b|
  b.report { n.times do; n == 1 or n == 2 or n == 3 or n == 5 or n == 6 or n == 7 or n == 8 or n == 9 or n == 10; end }
  b.report { n.times do; [1, 2, 3, 4, 5, 6, 7, 8, 9, 10].include?(n); end }
end

# $ ruby test.rb 
#       user     system      total        real
#   0.030000   0.000000   0.030000 (  0.029940)
#   0.030000   0.000000   0.030000 (  0.030755)