Function intersection 

pub fn intersection<T, L, R>(a: L, b: R) -> impl Iterator<Item = T>
where
    T: Ord,
    L: IntoIterator<Item = T>,
    R: IntoIterator<Item = T>,

Take the intersection of two sets represented by sorted, deduplicated iterators.

The elements returned will all be from a. This behaviour can be overridden by using intersection_by().

Time complexity: O(a.len() + b.len()).

Examples

use iter_set::intersection;

let a = [1, 2];
let b = [2, 3];

assert!(intersection(&a, &b).eq(&[2]));