More concise HashMap initialization

Question

I\'m using a HashMap to count the occurrences of different characters in a string:

let text = \"GATTACA\";
let mut counts: HashMap

        

Answer 1

Another way that I see in the official documentation:

use std::collections::HashMap;

fn main() {
    let timber_resources: HashMap<&str, i32> =
    [("Norway", 100),
     ("Denmark", 50),
     ("Iceland", 10)]
     .iter().cloned().collect();
    // use the values stored in map
}