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Predicate put_assoc/4
Availability::- use_module(library(assoc)).(can be autoloaded)
Source[det]put_assoc(+Key, +Assoc0, +Value, -Assoc)
Assoc is Assoc0, except that Key is associated with Value. This can be used to insert and change associations.

Examples

Normally used to update the value associated with a key. For example, if the value is a count that must be incremented, do

inc_count(Key, A0, A) :-
     get_assoc(Key, A0, C0, A, C), !,
     C is C0+1.
inc_count(Key, A0, A) :-
     put_assoc(Key, A0, 1, A).
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