minus_vs_delete.rb

require 'benchmark/ips'

Benchmark.ips do |x|
  x.report "nothing" do
    [1, 2, 3]
  end

  x.report "#-" do
    [1, 2, 3] - [3]
  end

  x.report "#delete" do
    [1, 2, 3].delete(3)
  end

  x.report "#delete + #tap" do
    [1, 2, 3].tap{|ary| ary.delete(3) }
  end

  x.report "#delete + lvar" do
    foo = [1, 2, 3]
    foo.delete(3)
    foo
  end

  x.compare!
end