If you are using NeoJSON you might want to take a look at the NeoJSONObject class. It's basically a Dictionary with "JavaScript" behavior. I.e. you can simply use messages to access keys and non existing keys return nil. Your example can thus be written as: val := dict1 key1 key2 key3. When using NeoJSON you can simply configure your Mapper (Reader/Writer) to use NeoJSONObject using #mapClass: CU, Udo On 24/04/2017 20:04, Markus Böhm wrote:
Tx for advice.
P.S.: I got nested dictionaries after JSON API call at wunderground weather API. To see all the response in Pharo inspector "live" is really great :-)
BR Mike
On Mon, Apr 24, 2017 at 7:51 PM, Cyril Ferlicot D. <cyril.ferlicot@gmail.com <mailto:cyril.ferlicot@gmail.com>> wrote:
Le 24/04/2017 à 19:42, Markus Böhm a écrit : > May I ask: > What's the idiomatic way to retrieve values from nested dictionaries? > > (((dict1 at: 'key1') at: 'key2') at: 'key3') > > Are all the brackets really necessary? > > BR Mike
Hi,
To know if brackets are necessary you can use the "Format" option in your method.
Right click -> format
or cmd/alt/ctrl + shift + f
In this case you can just write:
((dict1 at: 'key1') at: 'key2') at: 'key3'.
-- Cyril Ferlicot https://ferlicot.fr
http://www.synectique.eu 2 rue Jacques Prévert 01, 59650 Villeneuve d'ascq France