gsub_vs_tr.rb

require 'benchmark'

n = 1_000_000
Benchmark.bm(7) do |x|
  x.report('gsub')   { for i in 1..n; 'hello'.gsub('l', ''); end }
  x.report('tr')     { for i in 1..n; 'hello'.tr('l', '');   end }
  x.report('delete') { for i in 1..n; 'hello'.delete('l');   end }
end

#              user     system      total        real
# gsub     4.230000   0.000000   4.230000 (  4.230689)
# tr       1.230000   0.000000   1.230000 (  1.231086)
# delete   1.090000   0.010000   1.100000 (  1.092491)

#              user     system      total        real
# gsub     4.200000   0.000000   4.200000 (  4.202974)
# tr       1.220000   0.010000   1.230000 (  1.220776)
# delete   1.100000   0.000000   1.100000 (  1.097038)

#              user     system      total        real
# gsub     4.170000   0.000000   4.170000 (  4.178987)
# tr       1.230000   0.000000   1.230000 (  1.225010)
# delete   1.090000   0.000000   1.090000 (  1.089195)