Module: TheForce::ObjectSupport::InstanceMethods

Included in:
Object
Defined in:
lib/the_force/object_support.rb

Instance Method Summary collapse

Instance Method Details

#eigenclass ⇒ Object

this could also be labeled ‘self’?



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# File 'lib/the_force/object_support.rb', line 78

def eigenclass #this could also be labeled 'self'?
  class << self; self; end
end

#if(*args, &b) ⇒ Object

Will return a nil if the condition is false, otherwise it will return the receiver. The condition can be specified in 3 ways, as a list of arguments which are sent to Object#send, a block, or via essentially a delegate object, ala the andand gem.

Examples

  • 10.if(:>, 5) => 10

  • 10.if {|x| x == 5) => nil

  • 10.if.nonzero? => 10

Usage

This becomes useful to simplify logic when you want to specify a default value, (particularly in Rails views) or you have a receiver which is the result of a lengthy expression.

  • number_of_products.if.nonzero? || “Don’t you want to buy something?”

  • lovers.sort.reverse.unless.empty? || “Where’s the fever? :(”

Warning

Do not try to do:

This would evaluate to:

  • title > 20 || title.truncate(17) + “…”



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# File 'lib/the_force/object_support.rb', line 66

def if(*args, &b)
  TheForce::ObjectSupport.conditional(self, false, *args, &b)
end

#unless(*args, &b) ⇒ Object

Same as if, only with the predictably inverse logic.

Usage

  • title.unless.blank? || suggestion_html “please set your title on the edit page”



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# File 'lib/the_force/object_support.rb', line 74

def unless(*args, &b)
  TheForce::ObjectSupport.conditional(self, true, *args, &b)
end