Function is_subset 

pub fn is_subset<T: Eq + Hash>(a: &[T], b: &[T]) -> bool

Returns true if a is a subset of b (all elements of a are in b).

Example

use d3rs::array::is_subset;

let a = vec![1, 2, 3];
let b = vec![1, 2, 3, 4, 5];
assert!(is_subset(&a, &b));
assert!(!is_subset(&b, &a));