1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 #![feature(advanced_slice_patterns)]
13 #![feature(slice_patterns)]
17 fn foldl<T, U, F>(values: &[T],
21 U: Clone+Debug, T:Debug,
24 &[ref head, ref tail..] =>
25 foldl(tail, function(initial, head), function),
28 let res = initial.clone(); res
33 fn foldr<T, U, F>(values: &[T],
41 &[ref head.., ref tail] =>
42 foldr(head, function(tail, initial), function),
45 let res = initial.clone(); res
51 let x = &[1, 2, 3, 4, 5];
53 let product = foldl(x, 1, |a, b| a * *b);
54 assert_eq!(product, 120);
56 let sum = foldr(x, 0, |a, b| *a + b);