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 <[email protected] <javascript:>>
> 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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