delete-tr.rb

require 'benchmark'

TIMES = 1_000_000

s = "a string"

Benchmark.bmbm do |x|
  x.report("delete") do
    TIMES.times { s.delete(" ") }
  end

  x.report("tr") do
    TIMES.times { s.tr(" ", "") }
  end

  x.report("gsub with regexp") do
    TIMES.times { s.gsub(/ /, "") }
  end
  
  x.report("gsub with string") do
    TIMES.times { s.gsub(" ", "") }
  end
end

# Rehearsal ----------------------------------------------------
# delete             3.640000   0.010000   3.650000 (  3.726573)
# tr                 3.730000   0.000000   3.730000 (  3.728782)
# gsub with regexp   6.570000   0.010000   6.580000 (  6.573503)
# gsub with string   7.980000   0.010000   7.990000 (  7.993387)
# ------------------------------------------ total: 21.950000sec

#                        user     system      total        real
# delete             3.450000   0.010000   3.460000 (  3.444691)
# tr                 3.920000   0.000000   3.920000 (  3.919492)
# gsub with regexp   6.420000   0.010000   6.430000 (  6.437928)
# gsub with string   8.290000   0.010000   8.300000 (  8.322401)