Class: NilClass
- Defined in:
- lib/wedge/utilis/try.rb,
lib/wedge/utilis/blank.rb,
lib/wedge/utilis/duplicable.rb
Instance Method Summary collapse
-
#blank? ⇒ true
nil
is blank:. -
#duplicable? ⇒ Boolean
nil
is not duplicable:. -
#try(*args) ⇒ Object
Calling
try
onnil
always returnsnil
. -
#try!(*args) ⇒ Object
Calling
try!
onnil
always returnsnil
.
Instance Method Details
#blank? ⇒ true
nil
is blank:
nil.blank? # => true
56 57 58 |
# File 'lib/wedge/utilis/blank.rb', line 56 def blank? true end |
#duplicable? ⇒ Boolean
nil
is not duplicable:
nil.duplicable? # => false
nil.dup # => TypeError: can't dup NilClass
43 44 45 |
# File 'lib/wedge/utilis/duplicable.rb', line 43 def duplicable? false end |
#try(*args) ⇒ Object
Calling try
on nil
always returns nil
. It becomes especially helpful when navigating through associations that may return nil
.
nil.try(:name) # => nil
Without try
@person && @person.children.any? && @person.children.first.name
With try
@person.try(:children).try(:first).try(:name)
96 97 98 |
# File 'lib/wedge/utilis/try.rb', line 96 def try(*args) nil end |
#try!(*args) ⇒ Object
Calling try!
on nil
always returns nil
.
nil.try!(:name) # => nil
103 104 105 |
# File 'lib/wedge/utilis/try.rb', line 103 def try!(*args) nil end |