gistfile1.rb

class GetEnv

  def self.method_missing meth, key
    v = ENV[key].to_i
    return v if v.to_s == ENV[key]
    
    v = ENV[key].to_f
    return v if v.to_s == ENV[key]
    
    ENV[key]
  end

end


#
# Benchmarks
#

# Assumes the following environment variables exist; just run:
# export FLOAT=0.5 INT=2000 STRING=Testing


require 'benchmark'
include Benchmark

n = 500_000

Benchmark.benchmark(CAPTION, 7, FORMAT, ">total:", ">avg:")  do |x|
  x.report('Native string') { for i in 1..n; ENV['STRING']; end }
  x.report('GetEnv string') { for i in 1..n; GetEnv['STRING']; end }
  
  x.report('Native integer') { for i in 1..n; ENV['INT'].to_i; end }
  x.report('GetEnv integer') { for i in 1..n; GetEnv['INT']; end }
  
  x.report('Native float') { for i in 1..n; ENV['FLOAT'].to_f; end }
  x.report('GetEnv float') { for i in 1..n; GetEnv['FLOAT']; end }
  
end