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Add a method equivalent to `iter.enumerate().filter(|(_, x)| predicate(x))`.

cospectrum

Multiunzip supports only up to 12 iterators

5

I was trying to multiunzip an iterator of tuples of 37 elements, and I was getting this error: ``` error[E0277]: the trait bound `std::iter::Map, [closure@src/main.rs:193:14: 193:19]>` | note: required by...

pablo-slingshot

If you have two sorted iterators (e.g. from [`BTreeMap::keys`](https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.keys)) there are various set operations you might want to perform, including `union`, `intersection`, `difference` and `symmetric_difference`. `union` is implemented via [`itertools::merge`](https://docs.rs/itertools/0.10/itertools/fn.merge.html)....

alecmocatta

Would `filter_position` or the like be worth adding?

2

In a private project of mine I need to handle _a lot_ of vectors and iterators, and as such I found myself writing things equivalent to ```rust source.take(n).skip(1).chain(source.skip(n + 1))...

MultisampledNight

Add array_windows to as opposed to tuple_windows

1

Implementing `array_windows` as opposed to `tuple_windows` makes things more ergonomic. It would also allow a function to be generic over the number of items, for example: ```rust fn some_function ()...

jamespharaoh

Initial working example of lending iterator for combinations.

5

I was working on another project and realized that 30% of the runtime was the itertools `.combinations()` adapter allocating vectors on the heap. Added an implementation for a lending iterator...

Easyoakland

As it's known that `zip_eq` kills the performance, but I appreciate that it has helped to find a lot of runtime issues. So I'm curious whether it's worthwhile to add...

BugenZhao

Iterator that omits after a certain count, providing a substitute

2

I wrote this code for my purposes. But you can feel free to edit it and incorparate it into your crate. ### Example transformations ``` This is a test sentence....

Enyium

Add a `MapWindows` Iterator adapter

9

For problems that require working with windows of expensive to clone items, or large windows, tuple_windows isn't a good solution. Implementing a borrowed windows iterator is tricky if not impossible,...

Crazytieguy

Add a `PeekMap` iterator adaptor

1

Add an iterator that allows mapping with `(next_item, Option(&peek_item)`. This is useful for parsers. Exact semantics may vary, but the goal is to get something like `tuple_windows` without needing to...

tgross35