Question

How to get HashMap value by key in Rust

Answer 1

use std::collections::HashMap;

fn main() {
    let hm = HashMap::from([
        ("Rust", 3.8),
        ("C++", 2.1),
        ("Java", 8.3),
        ("C", 19.7),
    ]);

    match hm.get(&"C++") {
      Some(value)=> {
         println!("{}", value);
      }
      None => {
         println!("not found");
      }
    }
}


 
 
/*
run:
 
2.1
 
*/

 

70+ SQL courses for beginners and professionals