A.4.2 Creating association lists

An association list is created with one of the following predicates:

[semidet]empty_assoc(?Assoc)

Is true if Assoc is the empty association list.

[det]list_to_assoc(+Pairs, -Assoc)

Create an association from a list Pairs of Key-Value pairs. List must not contain duplicate keys.

Errors

domain_error(unique_key_pairs, List) if List contains duplicate keys

[det]ord_list_to_assoc(+Pairs, -Assoc)

Assoc is created from an ordered list Pairs of Key-Value pairs. The pairs must occur in strictly ascending order of their keys.

Errors

domain_error(key_ordered_pairs, List) if pairs are not ordered.