From: "rogerdpack (Roger Pack)" <rogerpack2005@...>
Date: 2012-07-14T15:39:04+09:00
Subject: [ruby-core:46421] [ruby-trunk - Feature #6731] add new method "Object.present?" as a counter to #empty?


Issue #6731 has been updated by rogerdpack (Roger Pack).

File present.txt added

Adding "presentation" txt file.
----------------------------------------
Feature #6731: add new method "Object.present?" as a counter to #empty?
https://bugs.ruby-lang.org/issues/6731#change-28042

Author: rogerdpack (Roger Pack)
Status: Open
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.


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