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Ruby Programming
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class Method
Parent: Object
Version: 1.6

Index:

[ ] 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)
    n*n
  end
end
aThing  = Thing.new
aMethod = aThing.method("square")
aMethod.call(9) 81
[ 1, 2, 3 ].collect(&aMethod) [1, 4, 9]

instance methods
[ ] meth[ [ args ]* ] -> anObject

Synonym for Method.call.

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 meth.call( [ args ]* ) -> anObject

Invokes the meth with the specified arguments, returning the method's return value.

m = 12.method("+")
m.call(3) 15
m.call(20) 32

to_proc meth.to_proc -> aProc

Returns a Proc object corresponding to this method.


Ruby Programming
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