Re: [SPOILER] Ruby RPNCalc (Solution to Quiz #25)

On Fri, 1 Oct 2004, Mike Stok wrote:

>     def do(*ops)
>         ops.each do |op|
>             # Checks for the operation in @@procs, if operation not found there
>             # then see if we have a do_<operation> we can use before failing
> 
>             if p = @@procs[op]
>                 n_args = p.arity
>                 raise RuntimeError, "stack empty"  if @stack.size < n_args
>                 args = @stack.shift(n_args)
>                 @stack.unshift(*p[*args])
>             else
>                 self.send("do_#{op}") rescue raise RuntimeError, "bad command"
>             end
>         end
>     end

Hmmm, args = @stack.shift(n_args) worked for the 2004-09-17 snapsoot, but

  args = @stack.slice!(0, n_args)

seems more likely to succeed!

Sorry,

Mike

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