SWI-Prolog -- order

Documentation
- Reference manual
  - The SWI-Prolog library
    - library(solution_sequences): Modify solution sequences
      - distinct/1
      - distinct/2
      - reduced/1
      - reduced/3
      - limit/2
      - offset/2
      - call_nth/2
      - order_by/2
      - group_by/4
- Packages

Availability::- use_module(library(solution_sequences)).(can be autoloaded)

order_by(+Spec, :Goal)

Order solutions according to Spec. Spec is a list of terms, where each element is one of. The ordering of solutions of Goal that only differ in variables that are not shared with Spec is not changed.

asc(Term): Order solution according to ascending Term
desc(Term): Order solution according to descending Term

This predicate is based on findall/3 and (thus) variables in answers are copied.