split a map into two maps in rust

To split a HashMap into two maps, we need to clone the original map and then remove the entries we want to keep in the original map or the new map. This can be done using the clone method of the HashMap and the iter method to iterate over the entries.

Here's an example:


main.rs
use std::collections::HashMap;

fn main() {
    let mut map: HashMap<String, i32> = HashMap::new();
    map.insert("one".to_string(), 1);
    map.insert("two".to_string(), 2);
    map.insert("three".to_string(), 3);
    map.insert("four".to_string(), 4);
    map.insert("five".to_string(), 5);

    // Clone the original map to get two identical maps
    let mut map1 = map.clone();
    let mut map2 = map.clone();

    // Remove entries we want to keep in original map
    map1.retain(|&k, _| k == "one" || k == "three" || k == "five");

    // Remove entries we want to keep in new map
    map2.retain(|&k, _| k == "two" || k == "four");

    println!("{:?}", map1); // {"three"=>3, "five"=>5, "one"=>1}
    println!("{:?}", map2); // {"two"=>2, "four"=>4}
}
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In this example, we first create a HashMap with some key-value pairs. We then clone this map to create two identical maps named map1 and map2. We then use the retain method to remove entries that we want to keep in one map or the other.

Finally, we print out the contents of map1 and map2 to verify that we have successfully split the original map into two maps.

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