class Method
Parent: Object
Version: 1.6


[ ] arity call to_proc

Method objects are created by Object#method, and are associated with a particular object (not just with a class). They may be used to invoke the method within the object, and as a block associated with an iterator.

class Thing
  def square(n)
aThing  =
aMethod = aThing.method("square") -> 81
[ 1, 2, 3 ].collect(&aMethod) -> [1, 4, 9]

instance methods
[ ] meth[ [args]* ] -> anObject
Synonym for
arity meth.arity -> aFixnum
Returns an indication of the number of arguments accepted by a method. Returns a nonnegative integer for methods that take a fixed number of arguments. For Ruby methods that take a variable number of arguments, returns -n-1, where n is the number of required arguments. For methods written in C, returns -1 if the call takes a variable number of arguments.
call [args]* ) -> anObject
Invokes the meth with the specified arguments, returning the method's return value.

m = 12.method("+") -> 15 -> 32

to_proc meth.to_proc -> aProc
Returns a Proc object corresponding to this method.

Extracted from the book "Programming Ruby - The Pragmatic Programmer's Guide"
Copyright © 2000 Addison Wesley Longman, Inc. Released under the terms of the Open Publication License V1.0.
This reference is available for download.