itertools

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Feature request: add methods like `map_err` that work on errors only, similar to `map_ok`. To match the existing `_ok` methods, that would be: - `filter_map_err` - `filter_err` - `flatten_err` -...

Kinrany

Feature: n-dimensional product over the same iterator

9

So that code like this: ```rust iproduct!(0..4, 0..4, 0..4) ``` becomes the more succinct: ```rust iproduct!(0..4; 3) ``` This would mandate vectors instead of tuples for the items. It would...

lorepozo

TupleCollect for N = 0

2

Currently, it's impossible to use `next_tuple` and similar tuple methods for unit type, even though such an impl could just return empty tuple on each call, without advancing inner iterator.

ivan770

itertools::Join is 2X slower than alternative.

3

If you replace: `iterable.into_iter().join(sep)` With ``` iterable.map(AsRef::as_ref) .collect::() .join(sep) ``` in Itertools::join the performance is 2X faster.

SteveBattista

Array combinations

3

An alternative to `TupleCombinations` that works in a similar fashion to the standard `Combinations` iterator. It's implemented using const generics and manages to work for >12 elements too. Another benefit...

conradludgate

Maintenance

3

Hi! It seems to me that itertools is quite low on maintenance power – a fairly big amount of PRs have the waiting-on-review tag, some are untagged and some issues...

jplatte

implement arrays and next_array

2

On the back of #547, starts implementing some more array features. This one includes the `arrays` adapter and `next_array` method. They work exactly like their tuple counter parts. It defines...

conradludgate

Const generics iterator candidates

6

Discussed in #546 where I've written an alternative to `tuple_combinations`, `array_combinations` which is an iterator that outputs `[T; N]`. This feature requires const generics which were introduced in Rust 1.51....

conradludgate

Some rough code (the trait bounds aren't exactly correct yet) ```rust fn flat_map_producto(self, rhs: impl FnMut(&Self::Item) -> J) -> impl Iterator where J: impl Iterator, Self::Item: Clone { self.flat_map(|e| rhs(e).map(|r|...

IndianBoy42

Currently this crate does has no README.md (and no readme key in Cargo.toml) causing it to be rendered without a README on crates.io. Why is that bad? Crates which miss...

rusty-snake