grouping-by

This small library provides users the possibility of grouping their iterators of various ways. It is still in development and therefore is not recommended for production code. There will be breaking changes constantly.

It is similar to Java Collectors.groupingBy

Example:

#[derive(Debug, PartialEq)]
struct Point {
   x: i32,
   y: i32,
}
let array: [Point; 4] = [
       Point { x: 1, y: 2 },
       Point { x: 1, y: 3 },
       Point { x: 2, y: 2 },
       Point { x: 2, y: 2 },
];

assert_eq!(
    [
        (1, vec![&Point { x: 1, y: 2 }, &Point { x: 1, y: 3 }]),
        (2, vec![&Point { x: 2, y: 2 }, &Point { x: 2, y: 2 }])
    ]
    .iter()
    .cloned()
    .collect::<HashMap<i32, Vec<&Point>>>(),
    array.iter().grouping_by(|point| point.x)
);

Usage

Just import the trait (use grouping_by::GroupingBy;) into your crate and use it on your iterators.