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On 1/21/07, Trans <transfire / gmail.com> wrote:
>
> Seesm like there should be a mehtod for this:
>
>   h   :a
, :b, :c }
>
>   h.what_method(:a, :c) #{ :a
, :c }
>      ^^^^^^^^^^^
>
> Or is there some other simple way we're supposed to do this?
>
> T.


I will try to answer your question,  but still it will  be more questions :(

Before thinking about the name, naming really is an art, I am thinking about
the  interface

(1) So there is *args as above

(2) Any object responding to #include?

We need two names now, great job Robert ;)

(1)
#grep,  wait a minute hash objects already have grep via Enumerable, no idea
how it works for hashes though
#filter or filter_keys
#intersect  might just be the wrong name
#delete_unless ugly because delete_if takes a block form only
my candidate is
#for_keys

{a
, b, c}.for_keys("hi", :alpha)  {"hi" 2}   # for some
values of a, b and c ;)

Now to
(2)
#for_keys_from consistent but long (even ugly)
#keys_from
#intersect
#use_keys
#shadow maybe
a different approach would be to define a method in Enumerable
Enumerable#shadow_hash

[*1..2].shadow_hash {a, b, c, d, e
1}   {1, 2}  # see
above

this allows even for a call without the accolades.

This all very vague but I feel that such methods would be very useful.

Cheers
Robert




-- 
"The best way to predict the future is to invent it."
- Alan Kay

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