#drain #narrow #consume #slices


Conveniently chip small pieces off a slice or str to use elsewhere

2 releases

0.0.2 Sep 10, 2020
0.0.1 Aug 26, 2020

#58 in Parser tooling

Download history 11/week @ 2020-08-24 31/week @ 2020-08-31 92/week @ 2020-09-07 15/week @ 2020-09-14 39/week @ 2020-09-21

59 downloads per month
Used in 6 crates (2 directly)


95 lines


Lib.rs Crates.io Docs.rs

Rust 1.40.0 Build Status Crates.io - License

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With this crate, you can conveniently chip pieces off a slice or str to use elsewhere.


Please use cargo-edit to always add the latest version of this library:

cargo add gnaw


use gnaw::{Drain as _, Pop as _, Unshift as _};

let mut text = "abcdefg";

assert_eq!(text.unshift(), Some('a'));
assert_eq!(text.pop(), Some('g'));

let mut drain = text.drain();
assert_eq!(drain.next(), Some('b'));
assert_eq!(drain.next(), Some('c'));
assert_eq!(drain.next_back(), Some('f'));
assert_eq!(drain.next_back(), Some('e'));

//TODO: Why isn't the mutable borrow released here?
//assert_eq!(text, "d");


Licensed under either of

at your option.


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.

Code of Conduct



gnaw strictly follows Semantic Versioning 2.0.0 with the following exceptions:

  • The minor version will not reset to 0 on major version changes (except for v1).
    Consider it the global feature level.
  • The patch version will not reset to 0 on major or minor version changes (except for v0.1 and v1).
    Consider it the global patch level.

This includes the Rust version requirement specified above.
Earlier Rust versions may be compatible, but this can change with minor or patch releases.

Which versions are affected by features and patches can be determined from the respective headings in CHANGELOG.md.

No runtime deps