[ruby-core:18151] Re: New array methods cycle, choice, shuffle (plus bug in cycle)

Jim Weirich <[e-mail]> writes:

> No, I think you are wildly off base with this suggestion.  However, I
> am considering proposing a version of Lisp's cxxxr functions (e.g.
> cadr, caddr) to navigate arbitrarily nested array structures.

Great idea! Here's some code from Bus Scheme[1] that does that:

>     def method_missing(sym)
>       sym = sym.to_s
>       return super(sym) unless sym =~ /^c([ad]+)r/
>
>       case sym
>       when /^c(a|d)r$/
>         send(sym)
>       when /^ca/
>         send(sym.sub('a', '')).car
>       when /^cd/
>         send(sym.sub('d', '')).cdr
>       end
>     end
>   end
>
>   alias_method :car, :first
>   def cdr; self[1 .. -1]; end

Oops; a bit late for April Fools' day; sorry.

-Phil

[1] Scheme written in Ruby, but implemented while riding the bus:
http://bus-scheme.rubyforge.org