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pl:prolog:pllib:delete_element [2019/06/27 15:50] |
pl:prolog:pllib:delete_element [2019/06/27 15:50] (aktualna) |
| ====== Delete element ====== |
| {{tag>lists}} |
| ===== Description ===== |
| Deleting all occurrences of an element from a list. |
| |
| **Source**: The Art of Prolog |
| ===== Download ===== |
| Program source code: {{delete_element.pl}} |
| ===== Listing ===== |
| <code prolog> |
| /* |
| delete(List,X,HasNoXs) :- |
| The list HasNoXs is the result of removing all |
| occurrences of X from the list List. |
| */ |
| |
| delete([X|Xs],X,Ys) :- delete(Xs,X,Ys). |
| delete([X|Xs],Z,[X|Ys]) :- X \== Z, delete(Xs,Z,Ys). |
| delete([],X,[]). |
| |
| % Program 3.18: Deleting all occurrences of an element from a list |
| </code> |
| ===== Comments ===== |
| |