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Rust program to check a HashMap contains a specified key or not

Rust | HashMap Program: Write a program to check a HashMap contains a specified key or not.
Submitted by Nidhi, on October 17, 2021

Problem Solution:

In this program, we will create a HashMap and insert some items into it. Then we check a HashMap contains a specified key or not.

Program/Source Code:

The source code to check a HashMap contains a specified key or not is given below. The given program is compiled and executed successfully.

// Rust program to check a HashMap 
// contains a specified key or not

use std::collections::HashMap;

fn main() 
{
    let mut map = HashMap::new();
    let mut key:&str="Key1";

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

    if map.contains_key(&key)
    {
        println!("Key '{}' is available in HashMap",key);
    }
    else
    {
        println!("Key {} is available in HashMap",key);
    }
}

Output:

Key 'Key1' is available in HashMap

Explanation:

Here, we created a HashMap. Then we inserted some items into it. After that, we checked a specified key exists in HashMap or not, and we printed the appropriate message.

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