iter_accumulate

An iterator adaptor for Rust that accumulates the elements from the base iterator using the provided closure.

This is similar to fold(), but instead of returning the final accumulated result, it returns an iterator that yields the current accumulated value for each iteration. In other words, the last element yielded by accumulate() is what would have been returned by fold() if it was used instead.

Example

use iter_accumulate::IterAccumulate;

let input = [1, 2, 3, 4, 5];
let mut iter = input.iter().accumulate(1, |acc, i| acc * i);

assert_eq!(iter.next(), Some(1));
assert_eq!(iter.next(), Some(2));
assert_eq!(iter.next(), Some(6));
assert_eq!(iter.next(), Some(24));
assert_eq!(iter.next(), Some(120));
assert_eq!(iter.next(), None);

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.