List comprehensions: Difference between revisions
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scala> pythagoranTriangles(21) |
scala> pythagoranTriangles(21) |
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res36: List[(Int, Int, Int)] = List((3,4,5), (5,12,13), (6,8,10), (8,15,17), (9,12,15), (12,16,20)) |
res36: List[(Int, Int, Int)] = List((3,4,5), (5,12,13), (6,8,10), (8,15,17), (9,12,15), (12,16,20)) |
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</pre> |
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=={{header|Scheme}}== |
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Scheme has no native list comprehensions, but SRFI-42 provides them: |
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<lang scheme> |
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(list-ec (:range x 1 21) |
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(:range y x 21) |
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(:range z y 21) |
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(if (= (* z z) (+ (* x x) (* y y)))) |
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(list x y z)) |
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</lang> |
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<pre> |
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((3 4 5) (5 12 13) (6 8 10) (8 15 17) (9 12 15) (12 16 20)) |
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</pre> |
</pre> |
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