From: Yukihiro Matsumoto <matz@...>
Date: 2011-06-13T13:09:41+09:00
Subject: [ruby-core:37075] [Ruby 1.9 - Feature #4877][Rejected] Unify Variable Expansion within Strings


Issue #4877 has been updated by Yukihiro Matsumoto.

Status changed from Assigned to Rejected

Expanding non-prefixed variables/expressions are too easy to conflict.  For example, you will have problem to print a string like "Foo#bar".  It would print "Foonil" or whatever depends on the value of the local variable bar.  For me, that is annoying too much.
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Feature #4877: Unify Variable Expansion within Strings
http://redmine.ruby-lang.org/issues/4877

Author: Lazaridis Ilias
Status: Rejected
Priority: Normal
Assignee: Yukihiro Matsumoto
Category: core
Target version: 


class VarTester
  $g = "global" 
  @@c = "class"
  
  def f
    "function"
  end

  def initialize
    @i = "instance"
    l = "local"
    puts "#$g #@@c #@i #l #f #{l} #{f}"
  end
end

VarTester.new 

#=> global class instance #l #f local function

=== User Context ===

3 variable types (Class- instance- and global) can be expanded by prefixing a single char ("#") (without the need to add "{}").

This should be enabled for local vars and ideally for functions, too (at least the attr accessors).

=== Pro ===

* consistent expansion of all variable types via "#"
* reduced typing (use of {} is optional)
* increased readability of strings which contain many variables.

=== Contra ===

?

=== Compatibility ===

This would break slightly existent behaviour:

 existent '#text' within strings would be expanded (should be a rare case)






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