Question

How to get HashMap size 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),
    ]);

    println!("{:?}", hm.len());
}


 
 
/*
run:
 
4
 
*/

 

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