Class: Object

Inherits:
BasicObject
Defined in:
lib/core_ext/object/blank.rb

Overview

Borrowed from: activesupport-4.2.2/lib/active_support/core_ext/object/blank.rb

Instance Method Summary collapse

Instance Method Details

#blank? ⇒ true, false

An object is blank if it’s false, empty, or a whitespace string. For example, ”, ‘ ’, nil, [], and {} are all blank.

This simplifies

address.nil? || address.empty?

to

address.blank?

Returns:

  • (true, false) 


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# File 'lib/core_ext/object/blank.rb', line 17

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

#presence ⇒ Object

Returns the receiver if it’s present otherwise returns nil. object.presence is equivalent to

object.present? ? object : nil

For example, something like

state   = params[:state]   if params[:state].present?
country = params[:country] if params[:country].present?
region  = state || country || 'US'

becomes

region = params[:state].presence || params[:country].presence || 'US'

Returns:



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# File 'lib/core_ext/object/blank.rb', line 44

def presence
  self if present?
end

#present? ⇒ true, false

An object is present if it’s not blank.

Returns:

  • (true, false) 


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# File 'lib/core_ext/object/blank.rb', line 24

def present?
  !blank?
end