String replacement/removal method benchmarks.

string_replacement.rb

require 'benchmark'
alias e puts
N = "\n"

N_TIMES = 550_000 # Run it n times.

e 'We will next compare the elimination of the character "f"'
e 'by comparing the methods .delete .gsub and .tr'+N+N

# Our Test String comes next.
TEST_STRING = ('abc def ghi jkl '+N) * 80

Benchmark.bm(17) { |x|
  x.report('Testing: .tr') {
    N_TIMES.times { TEST_STRING.tr('f','') }
  }
  x.report('Testing: .gsub') {
    N_TIMES.times { TEST_STRING.gsub('f','') }
  }
  x.report('Testing: .delete') {
    N_TIMES.times { TEST_STRING.delete('f') }
  }
}

string_replacement_ips.rb

require 'benchmark/ips'

Benchmark.ips do |x|
  # These parameters can also be configured this way
  x.time = 5
  x.warmup = 2

  TEST_STRING = ('abc def ghi jkl \n') * 80

  x.report('Testing: .tr') { TEST_STRING.tr('f','') }
  x.report('Testing: .gsub') { TEST_STRING.gsub('f','') }
  x.report('Testing: .delete') { TEST_STRING.delete('f') }

  x.compare!
end