From: Dave Burt <dave@...>
Date: 2005-10-27T15:37:05+09:00
Subject: Re: Cleaner syntax for .map (is there already a way, or ruby2 idea?)

Ron M:
>
> I find that a bunch of my code looks like
>
>   people.map{|person| person.email_addr}
>
> where I use map to apply a single method to elements inside arrays.


I've done something like this before:

module Enumerable
  def map_send(*methods)
    map {|obj| methods.inject(obj) {|obj, meth| obj.send(meth) }}
  end
end
a = %w{ foo bar baz}
a.map_send(:capitalize, :reverse)  #=> ["ooF", "raB", "zaB"]

> ....  I think something
> like this would be very nice:
>
>   people[*].email_addr

That's an interesting-looking operator there. I think it's very unclear what 
it does. I'd prefer the mouse-poo version
  people.map { @.email_addr }
or
  people.map { it.email_addr }

I don't think Enumerable wants a special operator like this; method names 
convey meaning.

Cheers,
Dave