Talk:Y combinator: Difference between revisions
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:: Ta! --[[User:Paddy3118|Paddy3118]] 04:31, 12 September 2010 (UTC) |
:: Ta! --[[User:Paddy3118|Paddy3118]] 04:31, 12 September 2010 (UTC) |
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=="Y" combinator in Scheme== |
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Actually, there is a way to implement the Y combinator in Scheme: |
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<lang scheme> |
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(define Y |
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(lambda (f) |
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(f (delay (Y f))))) |
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</lang> |
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but you have to call the function with <lang scheme>(force f)</lang> |
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example: |
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<lang scheme> |
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(define fact |
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(lambda (f) |
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(lambda (n) |
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(if (= n 0) 1 |
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(* n ((force f) (- n 1))))))) |
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</lang> |
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[[Special:Contributions/93.144.202.116|93.144.202.116]] |