Are there equivalents to slice::chunks/windows for iterators to loop over pairs, triplets etc?

by

It’s possible to take chunks of an iterator using Itertools::tuples, up to a 4-tuple:

use itertools::Itertools; // 0.9.0

fn main() {
    let some_iter = vec![1, 2, 3, 4, 5, 6].into_iter();

    for (prev, next) in some_iter.tuples() {
        println!("{}--{}", prev, next);
    }
}

(playground)

1--2
3--4
5--6

If you don’t know that your iterator exactly fits into the chunks, you can use Tuples::into_buffer to access any leftovers:

use itertools::Itertools; // 0.9.0

fn main() {
    let some_iter = vec![1, 2, 3, 4, 5].into_iter();

    let mut t = some_iter.tuples();
    for (prev, next) in t.by_ref() {
        println!("{}--{}", prev, next);
    }
    for leftover in t.into_buffer() {
        println!("{}", leftover);
    }
}

(playground)

1--2
3--4
5

It’s also possible to take up to 4-tuple windows with Itertools::tuple_windows:

use itertools::Itertools; // 0.9.0

fn main() {
    let some_iter = vec![1, 2, 3, 4, 5, 6].into_iter();

    for (prev, next) in some_iter.tuple_windows() {
        println!("{}--{}", prev, next);
    }
}

(playground)

1--2
2--3
3--4
4--5
5--6

If you need to get partial chunks / windows, you can get

More Related Contents:

  1. How do I write an iterator that returns references to itself?
  2. How to implement Iterator and IntoIterator for a simple struct?
  3. How can I add new methods to Iterator?
  4. Iterating over a slice’s values instead of references in Rust?
  5. is it possible to filter on a vector in-place?
  6. How do I perform iterator computations over iterators of Results without collecting to a temporary vector?
  7. How can I zip more than two iterators?
  8. Returning iterator of a Vec in a RefCell
  9. Iterator returning items by reference, lifetime issue
  10. How to write a Rust function that takes an iterator?
  11. How do I return a Filter iterator from a function?
  12. Why do generators not support map()?
  13. How do I get the minimum or maximum value of an iterator containing floating point numbers?
  14. Is there an owned version of String::chars?
  15. What is an idiomatic way to collect an iterator of &T into a collection of Ts?
  16. Using max_by_key on a vector of floats [duplicate]
  17. Writing a generic function that takes an iterable container as parameter in Rust
  18. How do I cope with lazy iterators?
  19. How do I avoid unwrap when converting a vector of Options or Results to only the successful values?
  20. How can I include a module from another file from the same project?
  21. How to iterate (keys, values) in JavaScript? [duplicate]
  22. When is it useful to define multiple lifetimes in a struct?
  23. What is the concrete type of a future returned from `async fn`?
  24. Is it possible to declare the type of the variable in Rust for loops?
  25. Why does printing a pointer print the same thing as printing the dereferenced pointer?
  26. Unable to compile Rust hello world on Windows: linker link.exe not found
  27. How does the enhanced for statement work for arrays, and how to get an iterator for an array?
  28. Erasing vector::end from vector
  29. How can an operator be overloaded for different RHS types and return values?
  30. Use of undeclared type or module `std` when used in a separate module

Leave a Comment