Thanks for your input Sean
On Saturday, May 4, 2013 3:07:49 AM UTC+3, Sean Corfield wrote:
>
> Just merge the new, known values back in since they've already been
> bound to their (possibly defaulted) values:
>
> (let [params (assoc params :my-key my-key)] ...)
>
> Sean
>
> On Fri, May 3, 2013 at 12:38 PM, Ryan <areka...@gmail.com <javascript:>>
> wrote:
> > Well, I need to do something more "clever" because I am passing the
> whole
> > map to another function which does validation on the key-value pairs.
> > So....i guess I need to append those default associations to the
> original
> > map myself...
> >
> > Something like...
> >
> >> (defn my-function [{:keys [my-key] :or {my-key 5} :as params}]
> >> (let [params (if (nil? (:my-key params)) (assoc params :my-key
> my-key)
> >> params)
> >> (str "my-key value is " (:my-key params)))
> >
> >
> > ...but it's too damn ugly, need to think about it a bit more.
> >
> > On Friday, May 3, 2013 10:22:59 PM UTC+3, Sean Corfield wrote:
> >>
> >> The :as key binds the entire _original_ map.
> >>
> >> The :or defaults apply only to the bound variables extracted from the
> map.
> >>
> >> It caught me out when I first used map destructuring but I soon got
> used
> >> to it.
> >>
> >>
> >> On Fri, May 3, 2013 at 12:08 PM, Ryan <areka...@gmail.com> wrote:
> >> > Thanks Anthony for your reply but I was already aware of that. I was
> >> > hoping
> >> > for some solution which would took care of the binding if :as was
> >> > provided
> >> > and would append the key-value to the :as parameter.
> >> >
> >> > I probably need to do that myself....but you never know, someone else
> >> > might
> >> > have done it and has an elegant proposal :)
> >> >
> >> > Ryan
> >> >
> >> >
> >> > On Friday, May 3, 2013 10:04:41 PM UTC+3, Anthony Rosequist wrote:
> >> >>
> >> >> The value of :my-key (or the default, if :my-key doesn't exist) is
> >> >> being
> >> >> bound to the symbol my-key, so all you need to do is this:
> >> >>
> >> >>> (defn my-function [{:keys [my-key] :or {my-key 5} :as params}]
> >> >>> (str "my-key value is " my-key))
> >> >>
> >> >>
> >> >> On Friday, May 3, 2013 1:52:46 PM UTC-5, Ryan wrote:
> >> >>>
> >> >>> Hello all,
> >> >>>
> >> >>> I have a question regarding the default values when destructuring
> with
> >> >>> :keys
> >> >>>
> >> >>> Let's assume that we have the following function:
> >> >>>
> >> >>>> (defn my-function [{:keys [my-key] :or {my-key 5} :as params}]
> >> >>>> (str "my-key value is " (:my-key params)))
> >> >>>
> >> >>>
> >> >>> A few test runs:
> >> >>>
> >> >>>>
> >> >>>> user=> (my-function {:my-key 1})
> >> >>>> "my-key value is 1"
> >> >>>
> >> >>>
> >> >>> Works as expected.
> >> >>>
> >> >>>> user=> (my-function {:another-key "hello"})
> >> >>>> "my-key value is "
> >> >>>
> >> >>>
> >> >>> As you can see here, my-key value is nil even thought I have a
> default
> >> >>> value of 5.
> >> >>> From the above observation, it seems that :as will not fill in the
> >> >>> missing keys with the default values if those are provided as in my
> >> >>> case.
> >> >>>
> >> >>> Does anyone have a solution for this?
> >> >>>
> >> >>> Thank you for your time
> >> >>>
> >> >>> Ryan
> >> >
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> >>
> >>
> >> --
> >> Sean A Corfield -- (904) 302-SEAN
> >> An Architect's View -- http://corfield.org/
> >> World Singles, LLC. -- http://worldsingles.com/
> >>
> >> "Perfection is the enemy of the good."
> >> -- Gustave Flaubert, French realist novelist (1821-1880)
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> --
> Sean A Corfield -- (904) 302-SEAN
> An Architect's View -- http://corfield.org/
> World Singles, LLC. -- http://worldsingles.com/
>
> "Perfection is the enemy of the good."
> -- Gustave Flaubert, French realist novelist (1821-1880)
>
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