Home » Rust » Rust Programs

Rust program to print Keys/values of a HashMap using iter() method

Rust | HashMap Example: Write a program to print Keys/values of a HashMap using iter() method.
Submitted by Nidhi, on October 14, 2021

Problem Solution:

In this program, we will create a HashMap and then we will insert items into HashMap using the insert() function. After that, we will print keys and values of created HashMap using the iter() method.

Program/Source Code:

The source code to print Keys/values of a HashMap using the iter() method is given below. The given program is compiled and executed successfully.

// Rust program to print Keys/values 
// of a HashMap using iter() method

use std::collections::HashMap;

fn main() 
{
    let mut map = HashMap::new();

    map.insert("Key1", 101);
    map.insert("Key2", 102);
    map.insert("Key3", 103);
    map.insert("Key4", 104);

    println!("HashMap Keys/values:");
    for (key, val) in map.iter() {
        println!("{} -> {}", key, val);
    }
}

Output:

HashMap Keys/values:
Key3 -> 103
Key1 -> 101
Key2 -> 102
Key4 -> 104

Explanation:

Here we created a HashMap. Then we inserted the item into HashMap and printed the keys/values of created HashMap using the iter() method.

Rust HashMap Programs »

---