Feature #6731
closedadd new method "Object.present?" as a counter to #empty?
Description
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.
Files
Updated by rogerdpack (Roger Pack) over 12 years ago
- File present.txt present.txt added
Adding "presentation" txt file.
Updated by claytrump (Clay Trump) over 12 years ago
Hum, wouldn't this conflict with Rails? In Rails, " ".present? is
falseclass Object
def present?
!(respond_to?(:empty?) ? empty? : !self)
endend
--
Updated by mame (Yusuke Endoh) over 12 years ago
- 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