Ruby Kernel

I'm playing with the RubyLanguage and I'm trying to override eval with my own eval. The PseudoCode is like this:


        def eval( params )

        doSomething

        old_eval( params )

        doSomethingElse

        end

How can I call the old eval from the new-one?

solution:


        alias :oldEval :eval

        def eval( code )

        puts "antes eval"

        oldEval( code )

        puts "despues eval"

        end


        $a = "Hola mundo"

        eval "puts $a"

Eval is a method of the Kernel. You can access it with 'Kernel.eval'.


        def eval( params )

        puts 'before eval'

        Kernel.eval( params )

        puts 'after eval'

        end

In irb you can see a list of all the Kernel methods by invoking 'Kernel.methods.sort'.