try vs && vs if

try_vs_&&_vs_if.rb

# Summary
# -------
# If you care about performance, use `&&` or an `if` statement instead of the object.foo.try(:name) pattern. 
#
# Like so...
#   object.foo.name if object.foo
# OR
#   object.foo && object.foo.name

class Object
  def try(*a, &b)
    if a.empty? && block_given?
      yield self
    else
      public_send(*a, &b) if respond_to?(a.first)
    end
  end
end

class Foo
  attr_reader :a
  def initialize(a = nil)
    @a = a    
  end
end

require "benchmark"


bar = Foo.new
baz = Foo.new(1)

n = 10000000
Benchmark.bm(40) do |x|
  x.report("try"){ n.times { bar.a.try(:class).try(:to_s) } }
  x.report("&& "){ n.times { baz.a && baz.a.class.to_s } }
  x.report("if "){ n.times { baz.a.class.to_s if baz.a } }
end

# Results
# -------
#                                               user     system      total        real
# try                                        6.750000   0.000000   6.750000 (  6.758586)
# &&                                         2.300000   0.000000   2.300000 (  2.297671)
# if                                         2.300000   0.000000   2.300000 (  2.308800)