From: "mame (Yusuke Endoh)" <mame@...>
Date: 2012-07-24T22:37:51+09:00
Subject: [ruby-core:46725] [ruby-trunk - Feature #6731][Rejected] add new method "Object.present?" as a counter to #empty?


Issue #6731 has been updated by mame (Yusuke Endoh).

Status changed from Open to Rejected

Roger Pack,

Sorry but this proposal was rejected at the developer meeting (7/21).

There are many possible definitions of "present?" depending upon
contexts.  It's not Ruby's decision.  People should decide the
definition for their context.

-- 
Yusuke Endoh <mame@tsg.ne.jp>
----------------------------------------
Feature #6731: add new method "Object.present?" as a counter to #empty?
https://bugs.ruby-lang.org/issues/6731#change-28392

Author: rogerdpack (Roger Pack)
Status: Rejected
Priority: Normal
Assignee: 
Category: 
Target version: 


Basically Object#present? , "An object is present if it���s not #empty?" [2]
or, in other words, "is there any data inside?"

Examples:

>> [].present?
=> false
>> [3].present?
=> true
>> ''.present?
=> false # because it's #empty?
>> 'a'.present?
=> true
>> nil.present?
=> false

Example usage:

  button.text=text if text.present? # I only care whether the text actually was set to something, and also don't want to worry about whether it's nil or not.

Thanks.

Basic implementation ([1]):

class Object

  def present?
    !(respond_to?(:empty?) ? empty? : !self)
  end

end

[1] http://stackoverflow.com/a/4649452/32453
[2] http://api.rubyonrails.org/classes/Object.html#method-i-present-3F they also use #blank but that's for a different feature request.


-- 
http://bugs.ruby-lang.org/