bench-5340.cr

require "benchmark"

class Foo
  getter query : String?

  def initialize(@query)
  end

  def method1
    @query if @query && !@query.try(&.empty?)
  end

  def method2
    if (query = @query) && !query.empty?
      query
    end
  end

  def method3
    @query.try do |query|
      query unless query.empty?
    end
  end
end

empty_query = Foo.new("")
with_query = Foo.new("something")
without_query = Foo.new(nil)

pp empty_query.method1
pp empty_query.method2
pp empty_query.method3

pp with_query.method1
pp with_query.method2
pp with_query.method3


pp without_query.method1
pp without_query.method2
pp without_query.method3

puts "-" * 10

Benchmark.ips do |x|
  x.report("empty_query.method1") { empty_query.method1 }
  x.report("empty_query.method2") { empty_query.method2 }
  x.report("empty_query.method3") { empty_query.method3 }
end

puts "-" * 10

Benchmark.ips do |x|
  x.report("with_query.method1") { with_query.method1 }
  x.report("with_query.method2") { with_query.method2 }
  x.report("with_query.method3") { with_query.method3 }
end

puts "-" * 10

Benchmark.ips do |x|
  x.report("without_query.method1") { without_query.method1 }
  x.report("without_query.method2") { without_query.method2 }
  x.report("without_query.method3") { without_query.method3 }
end

results.log

empty_query.method1 # => nil
empty_query.method2 # => nil
empty_query.method3 # => nil
with_query.method1 # => "something"
with_query.method2 # => "something"
with_query.method3 # => "something"
without_query.method1 # => nil
without_query.method2 # => nil
without_query.method3 # => nil
----------
empty_query.method1  495.7M (  2.02ns) (± 1.36%)       fastest
empty_query.method2 495.59M (  2.02ns) (± 1.27%)  1.00× slower
empty_query.method3 495.47M (  2.02ns) (± 1.25%)  1.00× slower
----------
with_query.method1 496.48M (  2.01ns) (± 1.13%)  1.00× slower
with_query.method2 494.55M (  2.02ns) (± 1.82%)  1.01× slower
with_query.method3 497.21M (  2.01ns) (± 1.30%)       fastest
----------
without_query.method1 494.91M (  2.02ns) (± 2.06%)  1.00× slower
without_query.method2 496.92M (  2.01ns) (± 0.84%)  1.00× slower
without_query.method3 497.06M (  2.01ns) (± 0.85%)       fastest