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pl:prolog:pllib:delete_element [2019/06/27 15:50] (aktualna) |
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| + | ====== 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 ===== | ||
