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'.

CategoryRuby