Method: Monkey::Ext::Object#instance_yield

Defined in:
lib/monkey/ext/object.rb

#instance_yield(block = nil, &alternate_block) ⇒ Object

Behaves like instance_eval or yield depending on whether a block takes an argument or not.

class Foo
  define_method(:foo) { 42 }
end

Foo.new.instance_yield { foo }        # => 42
Foo.new.instance_yield { |c| c.foo }  # => 42

Also, you can pass a proc directly:

block = proc { }
instance_yield(block)

Raises:

  • (ArgumentError) 


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# File 'lib/monkey/ext/object.rb', line 21

def instance_yield(block = nil, &alternate_block)
  raise ArgumentError, "too many blocks given" if block && alternate_block
  block ||= alternate_block
  raise LocalJumpError, "no block given (yield)" unless block
  block.arity > 0 ? yield(self) : instance_eval(&block)
end