Let's start with wtf!?
Published almost 6 years ago

UPDATE : Check Ticket 8818

Welcome to my new blog :) Now over to rails..

So you’ve been told about using cute shortcuts for enumerator like Post.find(:all).map(&:title) – you feel great using it, don’t you ?? And you laughed at those who didn’t understand how &:sym worked and continued to use .map ( |shit| shit.stupid } syntaxt! You were made feel geeky indirectly. I was there :-)

But those days are “over” and it’s time to go back home!

I’d let benchmark speak for me..

require 'benchmark'

class Symbol
  def to_proc
    Proc.new { |*args| args.shift.__send__(self, *args) }
  end
end

n = 10000

s = Struct.new :id
messages = []
n.times { messages << s.new(:id => rand(n)) }

Benchmark.bm do |x|  
  # Integer
  x.report { n.times { messages.map{|m| m.id} } }
  x.report { n.times { messages.map(&:id) } }
end

# $ ruby perform.rb 
#       user     system      total        real
#  33.280000   0.860000  34.140000 ( 34.912584)
# 191.940000   1.660000 193.600000 (197.168849)

Need I say anymore ? Wake up and smell the coffee.

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