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Example functional programming fold left and fold right in java 본문
Programming/Java
Example functional programming fold left and fold right in java
halatha 2011. 4. 30. 04:28import java.util.ArrayList; import java.util.List; // http://abel-perez.com/example-functional-programming-fold-left-and public class TestFunctionalSum { public static int foldLeft(List<Integer> elements, int seed, Function<Integer, Integer> function) { int accumulated = seed; for ( final Integer element : elements ) { accumulated = function.apply(element, accumulated); } return accumulated; } public static void main(final String[] args) { final List<Integer> elements = new ArrayList<Integer>(); elements.add(2); elements.add(6); elements.add(10); elements.add(5); elements.add(2); final int result = foldLeft(elements, 0, new Function<Integer, Integer>() { public Integer apply(Integer x, Integer y) { return x + y; } }); System.out.println(result); } } interface Function<A, B> { public B apply(A element, B accumulated); }
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