From: Pete Elmore <1337p337@...>
Date: 2007-10-24T02:48:12+09:00
Subject: Re: "with" statement

On 21/10/2007, Dan Yoder <dan@zeraweb.com> wrote:
> module Kernel
>   def with(object,&block)
>     object.instance_eval &block
>   end
> end
>
> with([1,2,3]) { length } # => 3

You could even do something like this:

module Kernel
  def with_block(*args, &block)
    send(*args) { |obj| obj.instance_eval &block }
  end
end

['asdf', 'jkl', 'semicolon'].with_block(:map) { length } # => [4, 3, 9]

That would allow something like this:
<% with_block(:form_for, :user, @user) { %>
  <%= text_field :name %>
  <%= text_field :email %>
  <%= password_field :password %>
<% } %>

It may or may not be useful, but it's fun.