Re: [racket] How to parse json from a web API

[Matthias Felleisen]

Suppose you have 

  (define L .. the quoted list below ..)

and 
 
 ;; Symbol Any -> Void 
 ;; add key and value to the GUI   
 (define (send-to-gui key value) 
    ... )

Then you can do things like this: 

  > (for ((h (in-list L))) (for (([key value] h)) (send-to-gui key value)))

The outer for loop iterates over list L and binds each of the hashes to h. The 
inner for loop iterates over the key-value pairs in each hash h. It binds each 
such pair, separately, to the variables key and value. The body of the inner 
loop can do what it wants. I used send-to-gui here. You may wish to see what 
displayln does. 

-- Matthias




On Jun 8, 2014, at 10:02 AM, Kieran Coldron wrote:

> This is my first time using racket or any lisp like language, but so far I 
> really like racket but I'm a complete noob.
> 
> I am wanting to make a simple application in racket for the website 
> hummingbird.me, an anime tracking website. Here is a mockup of the gui in 
> racket.
> <gwelbo.png>
> 
> 
> I want to populate this list-box with the json data from the users libary
> 
> this is what the json data looks like http://pastebin.com/VXNnZGbk and after 
> converting it to a hash:
> 
> '(#hasheq((private . #f)
>           (id . 5419481)
>           (status . "currently-watching")
>           (episodes_watched . 12)
>           (last_watched . "2014-06-07T22:49:04.788Z")
>           (rewatched_times . 0)
>           (notes . null)
>           (notes_present . null)
>           (rewatching . #f)
>           (anime .
>            #hasheq(
>                    (url . "http://hummingbird.me/anime/baccano";)
>                    (title . "Baccano!")
>                    (status . "Finished Airing")
>                    (slug . "baccano")
>                    (alternate_title . "")
>                    (episode_count . 13)
>                    (cover_image . 
> "http://static.hummingbird.me/anime/poster_images/000/002/039/large/26DCC78BD23438E7D713B8E2A825F46F_800_1094.jpg?1383481747";)
>                    (synopsis . "")
>                    (show_type . "TV")))
>           (rating . #hasheq(
>                    (value . "4.5")
>                    (type . "advanced"))))
>   #hasheq((private . #f)
>           (id . 5419483)
>           (status . "currently-watching")
>           (episodes_watched . 12)
>           (last_watched . "2014-06-07T22:49:22.644Z")
>           (rewatched_times . 0)
>           (notes . null)
>           (notes_present . null)
>           (rewatching . #f)
>           (anime .
>            #hasheq(
>                    (url . "http://hummingbird.me/anime/steins-gate";)
>                    (title . "Steins;Gate")
>                    (status . "Finished Airing")
>                    (slug . "steins-gate")
>                    (alternate_title . "")
>                    (episode_count . 24)
>                    (cover_image . 
> "http://static.hummingbird.me/anime/poster_images/000/005/646/large/5646.jpg?1387138585";)
>                    (synopsis . "")
>                    (show_type . "TV")))
>           (rating . #hasheq(
>                    (value . "5.0")
>                    (type . "advanced")))))
> 
> I understand that somehow I have to loop through the the hash to get the data 
> I require and possibly store it in a second hash? How would I go about doing 
> this? 
> Sorry if this is a stupid question and having no idea what I'm doing.
> 
> --
> Kieran Coldron
> ____________________
>  Racket Users list:
>  http://lists.racket-lang.org/users

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