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*ON THIS PAGE*# Sorting lists

**Author(s):** Richard A. O'Keefe (original version), The Ciao Development Team (changes and modifications).## Usage and interface

## Documentation on exports

`sort(List1,List2)`
**Other properties:** `sort(A,B)`
`sort(A,B)`
`keysort(List1,List2)`
## Documentation on imports

This module has the following direct dependencies:

This module implements some sorting list predicates.

PREDICATEsort/2

The elements of List1 are sorted into the standard order (see Comparing terms) and any identical elements are merged, yielding List2. The time and space complexity of this operation is at worst O(N lg N) where N is the length of List1.

Usage:

List2 is the sorted list corresponding to List1.

*Call and exit should be compatible with:*

(`basic_props:list/1`)List2 is a list.*The following properties should hold at call time:*

(`basic_props:list/1`)List1 is a list.*The following properties should hold upon exit:*

(`basic_props:list/1`)List2 is a list.*The following properties should hold globally:*

(`basic_props:native/1`)This predicate is understood natively by CiaoPP.

*If the following properties hold at call time:*

(`basic_props:list/1`)A is a list.*then the following properties hold globally:*

(`basic_props:eval/1`)sort(A,B) is evaluable at compile-time.

*The following properties hold globally:*

(`basic_props:sideff/2`)sort(A,B) is side-effect free.

PREDICATEkeysort/2

List1 is sorted into order according to the value of the *keys* of its elements, yielding the list List2. No merging takes place. This predicate is *stable*, i.e., if an element `A` occurs before another element `B` *with the same key* in the input, then `A` will occur before `B` also in the output. The time and space complexity of this operation is at worst O(N lg N) where N is the length of List1.

Usage:

List2 is the (key-)sorted list corresponding to List1.

*Call and exit should be compatible with:*

(`sort:keylist/1`)List2 is a list of pairs of the form`Key-Value`.*The following properties should hold at call time:*

(`sort:keylist/1`)List1 is a list of pairs of the form`Key-Value`.*The following properties should hold upon exit:*

(`sort:keylist/1`)List2 is a list of pairs of the form`Key-Value`.*The following properties should hold globally:*

(`basic_props:native/1`)This predicate is understood natively by CiaoPP.

REGTYPEkeylist/1

Usage:`keylist(L)`

L is a list of pairs of the form `Key-Value`.

REGTYPEkeypair/1

Usage:`keypair(P)`

P is a pair of the form "`K-_`", where `K` is considered the *key*.

*Packages:*`prelude`,`initial`,`condcomp`,`assertions`,`assertions/assertions_basic`,`nortchecks`,`isomodes`.

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