Benchmark for definded? vs nil? discussion

README.md

benchmark for article Ruby Memoization: ||= vs. Defined? Syntax

benchmark.rb

require 'benchmark'

n = 5000000
@variable = "whatever value"

Benchmark.bmbm do |x|
  x.report { @variable.nil? }
  x.report { defined?(@variable) }
end


# Rehearsal ------------------------------------
#    0.000015   0.000009   0.000024 (  0.000014)
#    0.000010   0.000006   0.000016 (  0.000011)
# --------------------------- total: 0.000040sec
#
#        user     system      total        real
#    0.000007   0.000003   0.000010 (  0.000004)
#    0.000010   0.000000   0.000010 (  0.000005)