Różnice między wybraną wersją a wersją aktualną.
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pl:prolog:pllib:select_first [2019/06/27 15:50] |
pl:prolog:pllib:select_first [2019/06/27 15:50] (aktualna) |
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| + | ====== Select first ====== | ||
| + | {{tag>lists}} | ||
| + | ===== Description ===== | ||
| + | Selecting the first occurrence of an element from a list | ||
| + | |||
| + | **Source**: The Art of Prolog | ||
| + | ===== Download ===== | ||
| + | Program source code: {{select_first.pl}} | ||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | /* | ||
| + | select_first(X,Xs,Ys) :- | ||
| + | Ys is the list obtained by removing the | ||
| + | first occurrence of X from the list Xs. | ||
| + | */ | ||
| + | select_first(X,[X|Xs],Xs). | ||
| + | select_first(X,[Y|Ys],[Y|Zs]) :- X \== Y, select_first(X,Ys,Zs). | ||
| + | |||
| + | % Program 7.4 Selecting the first occurrence of an element from a list | ||
| + | </code> | ||
| + | ===== Comments ===== | ||
