On 10/03/2009, at 3:52 PM, Nick Partridge wrote:
> Symbol-to-proc, and the use of `&` to coerce things to procs:
>
> [1,2,3,4,5].select(&:odd?)
>
> Awww yeah.
Cute but wasteful, and now deprecated in all Rails core code because of
the extra (non-gc-able?) object it creates.
I like this for creating and adding to hash values consisting of an
array:
things_by_key = {}
things.each do |thing|
(things_by_key[thing.key] ||= []) << thing
end
or the same using inject...
Clifford Heath.
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