Function filter 

pub fn filter<'a, T, F>(collection: &'a [T], predicate: F) -> Vec<&'a T>
where
    F: Fn(&'a T, usize) -> bool,

Filter items from a collection that satisfy a predicate.

This function iterates over a collection and returns a new vector containing all items for which the predicate returns true.

Arguments

• collection - A slice of items.
• predicate - A function that takes an item and its index, returning a boolean.

Returns

• Vec<&T> - A vector of references to items that satisfy the predicate.

Examples

use lowdash::filter;
let numbers = vec![1, 2, 3, 4, 5];
let result = filter(&numbers, |x, _| *x % 2 == 0);
assert_eq!(result, vec![&2, &4]);

use lowdash::filter;

#[derive(Debug, PartialEq)]
struct Person {
    name: String,
    age: u32,
}

let people = vec![
    Person { name: "Alice".to_string(), age: 25 },
    Person { name: "Bob".to_string(), age: 30 },
    Person { name: "Carol".to_string(), age: 35 },
];

let result = filter(&people, |p, _| p.age > 30);
assert_eq!(result, vec![&people[2]]);