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Anonymous recursion in Java
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import java.util.function.Function; | |
import java.util.function.UnaryOperator; | |
class Factorial { | |
static <T, R> Function<T, R> fix(UnaryOperator<Function<T, R>> operator) { | |
return operator.apply(argument -> fix(operator).apply(argument)); | |
} | |
static Function<Integer, Integer> factorial = fix(f -> n -> n == 0 ? 1 : n * f.apply(n - 1)); | |
} |
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