Function map_entries 

pub fn map_entries<K1, V1, K2, V2, F>(
    map: &HashMap<K1, V1>,
    iteratee: F,
) -> BTreeMap<K2, V2>
where
    K1: Eq + Hash + Clone + Ord,
    K2: Eq + Hash + Ord,
    V1: Clone,
    V2: Clone,
    F: Fn(&K1, &V1) -> (K2, V2),

Transforms the entries of a map using a provided function.

Arguments

• map - The input map whose entries are to be transformed.
• iteratee - A function that takes a reference to a key and its value, returning a new key and value.

Returns

• BTreeMap<K2, V2> - A new map with transformed entries.

Examples

use lowdash::map_entries;
use std::collections::HashMap;

let mut map = HashMap::new();
map.insert("a", 1);
map.insert("b", 2);

let transformed = map_entries(&map, |k, v| (k.to_uppercase(), v * 10));
assert_eq!(transformed.get("A"), Some(&10));
assert_eq!(transformed.get("B"), Some(&20));