Feature #6731: add new method "Object.present?" as a counter to #empty?

• Status: Rejected
• Assignee: -
• Target version: -

[rogerdpack (Roger Pack)]

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.

[rogerdpack (Roger Pack)]

• File present.txt present.txt added

Adding "presentation" txt file.

[claytrump (Clay Trump)]

Hum, wouldn't this conflict with Rails? In Rails, " ".present? is
falseclass Object

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

end

--

[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 [e-mail]