conditionals on the end of lines. simple but awesome.
puts "Awesome" if @apple.awesome?
rather than the verbose and less readable C example :P
if (apple->flavour == "awesome")
printf("Awesome\n");
You can even use them on the ends of class definitions and such if
really want to.
class Foo
end if defined?(Foo).nil?
C
On 10/03/2009, at 4:15 PM, Daniel N wrote:
>
>
> On Tue, Mar 10, 2009 at 4:05 PM, Clifford Heath <[email protected]
> > wrote:
>
> 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.
>
>
> Hey Cliff,
>
> One of the things I like with hashes is default values set with
> procs :)
>
> things_by_key = Hash.new{|h,k| h[k] = []}
> things.each do |thing|
> things_by_key[thing.key] << thing
> end
>
> I use these all the time for default values in all sorts of ways :)
>
> Daniel
>
> >
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