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]> 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 > > -- > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to [email protected] > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > -- 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) -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to [email protected] Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
