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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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7
Task/Optional-parameters/Common-Lisp/optional-parameters-1.lisp Normal file
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(defun sort-table (table &key (ordering #'string<)
(column 0)
reverse)
(sort table (if reverse
(complement ordering)
ordering)
:key (lambda (row) (elt row column))))

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Task/Optional-parameters/Common-Lisp/optional-parameters-2.lisp Normal file
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CL-USER> (defparameter *data* '(("a" "b" "c") ("" "q" "z") ("zap" "zip" "Zot")))
*DATA*
CL-USER> (sort-table *data*)
(("" "q" "z") ("a" "b" "c") ("zap" "zip" "Zot"))
CL-USER> (sort-table *data* :column 2)
(("zap" "zip" "Zot") ("a" "b" "c") ("" "q" "z"))
CL-USER> (sort-table *data* :column 1)
(("a" "b" "c") ("" "q" "z") ("zap" "zip" "Zot"))
CL-USER> (sort-table *data* :column 1 :reverse t)
(("zap" "zip" "Zot") ("" "q" "z") ("a" "b" "c"))
CL-USER> (sort-table *data* :ordering (lambda (a b) (> (length a) (length b))))
(("zap" "zip" "Zot") ("a" "b" "c") ("" "q" "z"))