# Itertools
Extra iterator adaptors, functions and macros.
Please read the [API documentation here](
https://docs.rs/itertools/).
[](https://github.com/rust-itertools/itertools/actions)
[](https://crates.io/crates/itertools)
How to use with Cargo:
```toml
[dependencies]
itertools = "0.10.5"
```
How to use in your crate:
```rust
use itertools::Itertools;
```
## How to contribute
- Fix a bug or implement a new thing
- Include tests for your new feature, preferably a QuickCheck test
- Make a Pull Request
For new features, please first consider filing a PR to [rust-lang/rust](
https://github.com/rust-lang/rust),
adding your new feature to the `Iterator` trait of the standard library, if you believe it is rea
sonable.
If it isn't accepted there, proposing it for inclusion in ``itertools`` is a good idea.
The reason for doing is this is so that we avoid future breakage as with ``.flatten()``.
However, if your feature involves heap allocation, such as storing elements in a ``Vec<T>``,
then it can't be accepted into ``libcore``, and you should propose it for ``itertools`` directly instead.
## License
Dual-licensed to be compatible with the Rust project.
Licensed under the Apache License, Version 2.0
https://www.apache.org/licenses/LICENSE-2.0 or the MIT license
https://opensource.org/licenses/MIT, at your
option. This file may not be copied, modified, or distributed
except according to those terms.
