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parameters 

        # Method.parameters

(from ruby core)
---
    meth.parameters  -> array

---

Returns the parameter information of this method.

    def foo(bar); end
    method(:foo).parameters #=> [[:req, :bar]]

    def foo(bar, baz, bat, &blk); end
    method(:foo).parameters #=> [[:req, :bar], [:req, :baz], [:req, :bat], [:block, :blk]]

    def foo(bar, *args); end
    method(:foo).parameters #=> [[:req, :bar], [:rest, :args]]

    def foo(bar, baz, *args, &blk); end
    method(:foo).parameters #=> [[:req, :bar], [:req, :baz], [:rest, :args], [:block, :blk]]

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.