SWI-Prolog -- get

Documentation
- Reference manual
  - SWI-Prolog extensions
    - Dicts: structures with named arguments
      - Predicates for managing dicts
        
        is_dict/1
        
        is_dict/2
        
        get_dict/3
        
        get_dict/5
        
        dict_create/3
        
        dict_pairs/3
        
        put_dict/3
        
        put_dict/4
        
        del_dict/4
        
        :</2
        
        select_dict/3
        
        >:</2
        
        Destructive assignment in dicts
- Packages

Availability:built-in

get_dict(?Key, +Dict, -Value)

Unify the value associated with Key in dict with Value. If Key is unbound, all associations in Dict are returned on backtracking. The order in which the associations are returned is undefined. This predicate is normally accessed using the functional notation Dict.Key. See section 5.4.1.

Fails silently if Key does not appear in Dict. This is different from the behavior of the functional‘.`-notation, which throws an existence error in that case.