Created
March 6, 2013 14:16
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Y combinator factorial in Groovy
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| fact_improver = { partial -> | |
| { BigInteger n -> | |
| n == 0 ? 1 : n * partial( n - 1 ) | |
| } | |
| } | |
| y = { improver -> | |
| { gen -> { BigInteger n -> improver( gen( gen ) )( n ) } } { gen -> | |
| { BigInteger n -> improver( gen( gen ) )( n ) } } | |
| } | |
| fx = y( fact_improver ) | |
| fx( 5 ) |
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After watching Jim Weirich: Adventures in Functional Programming