itertools

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Feature Request: `single_result`

1

This is similar to `partition_result`. The idea is that instead of a collection of `Ok` values and a collection of `Err` values, it would return a single `Result`. This is...

MasterTemple

Canonicalize `all_equal_value`'s error

2

Similar to `exactly_one_error`'s error type, `all_equal_value`'s error type now implements `std::error::Error`. (I saw the discrepancy because [`exactly_one_error` works with `anyhow`, whereas `all_equal_value` does not](https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=1a7b1ab8181cc5345ecc2461709b8cf6).) Since I had to introduce a...

phimuemue

track_caller for zip_eq

3

This is expected to panic on length mismatch

dspyz-matician

Hello itertools users and maintainers! The Rust library team has recently discussed the possibility of upstreaming some of the more commonly used itertools methods to the standard library. We now...

Amanieu

Feature Request: `next_arrayvec` iterator method

1

It would be interesting to add a `next_arrayvec` iterator method. It should construct an ArrayVec with capacity `N`, filling it from the next elements of an iterator. If not enough...

wmstack

Format should not panic if you try to format it more than once

2

Some logging frameworks will format things sent to the `error!` macro twice. Some possible solutions: 1. Print a "iterator exhausted" message instead of panicking 2. Impose a `Clone` bound on...

zxqfl

Deprecate `multiunzip` after switching to Rust 1.85

3

Rust 1.85 implements `FromIterator` for `(A_1, ..., A_n)` when each `A_i` is `Default + Extend` (and `n` is at most 12) so `iter.multiunzip()` can be replaced by `iter.collect()`.

ronnodas

Not sure on the difference between std::chunk_by and itertools::chunk_by

4

Hello! [std has chunk_by](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.chunk_by) and [so does itertools](https://docs.rs/itertools/latest/itertools/trait.Itertools.html#method.chunk_by) It seems to me, that the only difference is that std does not return the value of the functor, But I'm not...

arifd

question: how it will look to use iter tools to merge sum 2 HashMap<K: Hash + Eq, V : Add + Copy>?

4

What would be equivalent of this? ```rust fn merge_sum( map1: HashMap, map2: HashMap, ) -> HashMap { let mut merged = map1; for (key, value) in map2 { *merged.entry(key).or_insert(0) +=...

dzmitry-lahoda

Add `array_chunks` and `array_windows`?

4

Now that `next_array` exists, it's not so hard to write the methods `array_chunks` (functionally equivalent to `from_fn(|| self.next_array())`) and `array_windows`, similar to the unstable [`slice::array_chunks`](https://github.com/rust-lang/rust/issues/74985) and [`slice::array_windows`](https://github.com/rust-lang/rust/issues/75027) respectively. However it's...

ronnodas