6 releases
0.1.5+deprecated | Dec 19, 2022 |
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0.1.4 | Dec 27, 2020 |
0.1.3 | Jun 16, 2020 |
0.1.2 | May 21, 2019 |
0.1.1 | Jun 19, 2016 |
#17 in #fold
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Used in 8 crates
(6 directly)
8KB
iter.reduce(fn)
This crate gives Iterators a reduce
function that is similar to
fold
but without an initial value. The function returns None
if
the iterator is empty and Some(value)
otherwise. This matches the distinction
between reduce
and fold
in Scala.
[dependencies]
reduce = "0.1"
Examples
use reduce::Reduce;
fn main() {
// Reduce a non-empty iterator into Some(value)
let v = vec![1usize, 2, 3, 4, 5];
let sum = v.into_iter().reduce(|a, b| a + b);
assert_eq!(Some(15), sum);
// Reduce an empty iterator into None
let v = Vec::<usize>::new();
let sum = v.into_iter().reduce(|a, b| a + b);
assert_eq!(None, sum);
}
License
Licensed under either of Apache License, Version 2.0 or MIT license at your option.Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.