On 6 Feb 2009, at 00:13, [email protected] wrote:
>
> It is not possible in "plain" ruby because Rails extends the Symbol
> class with the possibility of converting it into a Proc (that's what
> happens when you precede something with a &). From the Rails source
> code:
Although it's worth noting that Symbol#to_proc is in newer versions of
ruby (1.9 and 1.8.7 IIRC)
Fred
>
>
> unless :to_proc.respond_to?(:to_proc)
> class Symbol
> # Turns the symbol into a simple proc, which is especially useful
> for enumerations. Examples:
> #
> # # The same as people.collect { |p| p.name }
> # people.collect(&:name)
> #
> # # The same as people.select { |p| p.manager? }.collect { |p|
> p.salary }
> # people.select(&:manager?).collect(&:salary)
> def to_proc
> Proc.new { |*args| args.shift.__send__(self, *args) }
> end
> end
> end
>
> And it does come very handy indeed.
> Balint
>
> On Feb 6, 1:07 am, Kenneth McDonald <[email protected]>
> wrote:
>> I've seen a claim on the web that &:f is just Ruby shorthand for
>> &proc
>> { |i| i.f }, but I've certainly never been able to get this &:f
>> notation to work in standard ruby.
>>
>> Thanks,
>> Ken
> >
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