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Predicate put_dict/3
Availability:built-in
put_dict(+New, +DictIn, -DictOut)
DictOut is a new dict created by replacing or adding key-value pairs from New to Dict. New is either a dict or a valid input for dict_create/3. This predicate is normally accessed using the functional notation. Below are some examples: 
?- A = point{x:1, y:2}.put(_{x:3}).
A = point{x:3, y:2}.

?- A = point{x:1, y:2}.put([x=3]).
A = point{x:3, y:2}.

?- A = point{x:1, y:2}.put([x=3,z=0]).
A = point{x:3, y:2, z:0}.
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LogicalCaptain said (2020-07-15T10:42:54):0 upvotes 0 0 downvotes
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Improvement

The argument New should really be called Updates or NewKeyValuePairs because these are updates which are merged with DictIn to give DictOut.

Test cases

dict_put_dotcall_testing.pl