Re: optional first map argument

adding this new binding syntax? [(attrs map?) contents]       ; optional first map argument [(attrs map? {}) contents]    ; with default value [(s String)] ; is shorthand for [(s #(instance? String %))] ; a function taking optional map, vector, string arguments. [(m map?) (v vector?) (s

Re: optional first map argument

What about adding this new binding syntax? [(attrs map?) contents]       ; optional first map argument [(attrs map? {}) contents]    ; with default value [(s String)] ; is shorthand for [(s #(instance? String %))] ; a function taking optional map, vector, string arguments. [(m map?) (v

optional first map argument

I often need to do this when writing hiccup helper functions: (defn my-widget [ args] (let [attrs(if (map? (first args)) (first args) {}) contents (if (map? (first args)) (next args) args)] ... I found this post, but considering that it is 4 years old, is there any new

Re: optional first map argument

You could look at the impl: https://github.com/weavejester/hiccup/blob/master/src/hiccup/def.clj On Mon, Jun 3, 2013 at 12:22 PM, Alice dofflt...@gmail.com wrote: I often need to do this when writing hiccup helper functions: (defn my-widget [ args] (let [attrs(if (map? (first

Re: optional first map argument

On 03/06/13 18:22, Alice wrote: I often need to do this when writing hiccup helper functions: (defn my-widget [ args] (let [attrs(if (map? (first args)) (first args) {}) contents (if (map? (first args)) (next args) args)] ... I found this post, but considering that it

Re: optional first map argument

I sometimes need to inspect or modify the map in the function, but defelem only merges the map. On Jun 4, 2:30 am, gaz jones gareth.e.jo...@gmail.com wrote: You could look at the impl: https://github.com/weavejester/hiccup/blob/master/src/hiccup/def.clj On Mon, Jun 3, 2013 at 12:22 PM,

Re: optional first map argument

The same reason that hiccup tag vector is taking optional attribute map. It's more readable. (my-widget {:id id1} hello world) vs. (my-widget {:attr {:id id1} :contents '(hello world)}) On Jun 4, 2:38 am, Jim - FooBar(); jimpil1...@gmail.com wrote: On 03/06/13 18:22, Alice wrote: I often

Re: optional first map argument

On 03/06/13 19:04, Alice wrote: It's more readable. (my-widget {:id id1} hello world) you can get to almost exactly that with the last variant I posted. (defn my-widget ([attrs contents] (apply widget-creator attrs contents)) ;;I have no idea what widget-creator might be ([contents]

Re: optional first map argument

(defn my-widget     ([attrs contents] (apply widget-creator attrs contents)) ;;I have no idea what widget-creator might be     ([contents] (my-widget {} contents))     ([] (my-widget {} [])) contents of one arity version can be a map. so the code should be (defn my-widget ([attrs

Re: optional first map argument

Hi, there is always the possibility of a macro. (defmacro defwidget [name body] (let [[docstring [attrs _ contents] body] (if (string? (first body)) [(first body) (second body) (nthnext body 2)] [nil (first body) (next body)])]