Class: Nilable

Inherits:
BasicObject
Defined in:
lib/nilable.rb,
lib/nilable/version.rb

Overview

Nilable object is a tool to handle nil invocations.

Any Nilable object wraps a single value object and proxy method invocations to it. In turn, every method result is wrapped in an Nilable object.

That way, if somewhere along the call chain, method result is nil, no NoMethodError will be raised. It acts as a black hole object.

Constant Summary collapse

VERSION = 
'1.0.0'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(object) ⇒ Nilable

Returns a new instance of Nilable.



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# File 'lib/nilable.rb', line 14

def initialize(object)
  @value = object.is_a?(::Nilable) ? object.value : object
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object 



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# File 'lib/nilable.rb', line 18

def method_missing(name, *args, &block)
  if value
    ::Nilable.new(value.public_send(name, *args, &block))
  else
    self
  end
end

Instance Attribute Details

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/nilable.rb', line 12

def value
  @value
end