Question

How to get HashSet size in Rust

Answer 1

use std::collections::HashSet;
  
fn main() {
    let mut hs = HashSet::new();
  
    hs.insert("Rust");
    hs.insert("C");
    hs.insert("C");
    hs.insert("C++");
    hs.insert("Java");
  
    println!("{:?}", hs.len());
}




/*
run:

4

*/

 

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