Why cant I do things like:
my_prop = :foo => :bar
when its possible to do:
my_meth :foo => :bar
??
ive tried with
my_prop = (:foo => :bar)
to but no luck…
//Roger
Why cant I do things like:
my_prop = :foo => :bar
when its possible to do:
my_meth :foo => :bar
??
ive tried with
my_prop = (:foo => :bar)
to but no luck…
//Roger
also , is it wrong to use the x => y construct in other context than
describing hashtables?
in my case my idea was to associate symbols with values in a sort of
.net attribute/annotation way
"
meta.some_prop= :parent_of => [:sometype,:someprop]
attr_accessor :some_prop
"
it works just fine for everything except for set properties. (whatever
you might call them in ruby)
"
meta.my_meth :foo => :bar
def my_meth()
end
"
works just fine…
(the “meta” is an extended method on Class which returns an attribute
object which in turn handles method_missing and then stores the
class,methodid and data in a static lookup)
Hi –
On Sat, 24 Jun 2006, Roger J. wrote:
ive tried with
my_prop = (:foo => :bar)
to but no luck…
You need to use the hash literal constructor:
my_prop = { :foo => :bar }
The only time you’re allowed not to use it, and still have Ruby know
that you’re trying to construct a hash, is the special case of a
method call:
my_meth :a => “b”, :c => “d”
which is equivalent to:
my_meth({:a => “b”, :c => “d”})
David
–
David A. Black ([email protected])
Ruby Power and Light, LLC (http://www.rubypowerandlight.com)
See what the readers are saying about “Ruby for Rails”!
When you do my_method :foo => :bar Ruby turns this in to
my_method({:foo => :bar}) to provide a pseudo-keyword-argument system.
This isn’t legal anywhere else in Ruby code.
Hi –
On Sat, 24 Jun 2006, Roger J. wrote:
also , is it wrong to use the x => y construct in other context than
describing hashtables?
I don’t know of any meaning for => other than hash separator.
class,methodid and data in a static lookup)
Be advised: nothing is static in Ruby
David
–
David A. Black ([email protected])
Ruby Power and Light, LLC (http://www.rubypowerandlight.com)
See what the readers are saying about “Ruby for Rails”!
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