Anonymous recursion: Difference between revisions
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( function(n) if (n <= 1) 1 else Recall(n-1)+Recall(n-2) )(n) |
( function(n) if (n <= 1) 1 else Recall(n-1)+Recall(n-2) )(n) |
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}</lang> |
}</lang> |
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=={{header|Racket}}== |
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In Racket, local helper function definitions inside of a function are only visible locally and do not pollute the module or global scope. |
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<lang lisp> |
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#lang racket |
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(define (fact n) |
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(define (fact-helper n acc) |
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(if (= n 0) |
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acc |
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(fact-helper (sub1 n) (* n acc)))) |
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(fact-helper n 1)) |
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;; unit tests |
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(module+ test |
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(require rackunit) |
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(check-equal? (fact 0) 1) |
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(check-equal? (fact 5) 120)) |
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</lang> |
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=={{header|REXX}}== |
=={{header|REXX}}== |
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