Thanks, superficial changes are good too :)
----
One question I forgot that is important is:
- how would I accomplish the 'maybe' monad style where the web service call
would return nil? on failure. Is the normal pattern for this an if-let at
the top before the rest of the transformations are applied?
On Tuesday, April 23, 2013 5:19:08 PM UTC-4, Steven Degutis wrote:
>
> I'm also quite new to Clojure, but here are some very superficial changes
> I would make to your code, without actually giving much thought to your
> algorithms:
>
> (defn- transform-album-images [images]
> (into {} (for [image images]
> [(:size image)
> (:#text image)])))
>
> (defn- transform-album [album]
> (-> (select-keys album [:name :artist :image])
> (update-in [:image] transform-album-images)
> (clojure.set/rename-keys { :image :images })))
>
> (defn search [term]
> (let [albums (-> (api/get {:method "album.search" :album term})
> (get-in [:results :albummatches :album] [])
> (vector))]
> {:albums (map transform-album albums)}))
>
> -Steven
>
>
> On Tue, Apr 23, 2013 at 4:12 PM, Huey Petersen <[email protected]<javascript:>
> > wrote:
>
>> Howdy,
>>
>> I'm a clojure fan but quite new to writing clojure. I'm writing my first
>> app and had a few style questions.
>>
>> I'm doing a web service call to the lastfm api. It returns some json
>> like:
>>
>> {
>> "results": {
>> "albummatches": {
>> "album": [
>> {
>> "name": "In The Future",
>> "artist": "Black Mountain",
>> "image": [{
>> "size": "small",
>> "#text": "http://example.com/image/url.jpg";
>> }]
>> }
>> ]
>> }
>> }
>> }
>>
>>
>> One notes is that the 'album' key in the json can either be missing (0
>> results) a map itself (1 result) or the array (2+ results).
>>
>> I then want to turn it into structure like:
>>
>> {
>> "albums": [{
>> "name": "In The Future",
>> "artist": "Black Mountain",
>> "images": {
>> "small": "http://example.com/image/url.jpg";
>> }
>> }]
>> }
>>
>>
>> Here is the clojure code I came up with:
>>
>> (defn- transform-album-images [images]
>> (into {} (map (fn [image] [(:size image) (:#text image)]) images)))
>>
>> (defn- transform-album [album]
>> (let [album (select-keys album [:name :artist :image])
>> album (update-in album [:image] transform-album-images)
>> album (clojure.set/rename-keys album { :image :images })]
>> album))
>>
>> (defn search [term]
>> (let [albums (api/get {:method "album.search" :album term})
>> albums (get-in albums [:results :albummatches :album] [])
>> albums (if (vector? albums) albums (vector albums))
>> albums (map transform-album albums)]
>>
>> {:albums albums}))
>>
>>
>>
>> My main question is whether this is at all 'idomatic' clojure. I have a
>> few specific questions too.
>>
>> - I broke out two functions -- transform-album-images and transform-album
>> -- because I wasn't sure how to squeeze them into the first function. They
>> really have no purpose outside of the 'search' function though. I don't
>> know why, but it kinda bugs me because it seems to detract from the main
>> function 'search' as they have to appear above 'search'.
>>
>> - the (api/get ...) call talks to an external webservice. Everything
>> else is a 'pure' function. Is including the (api/get) call inside the
>> 'search' function bad? I'm a bit hazy on the write split from pure /
>> non-pure code.
>>
>> I feel like transforming data between two representations with a side
>> effect at each end is like 90% of code I write so I'd like to get a good
>> feel for doing this in clojure :)
>>
>> Thanks for any tips.
>>
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>>
>
>
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