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Rust program to remove an item from HashSet

Rust | HashSet Example: Write a program to remove an item from HashSet.
Submitted by Nidhi, on October 24, 2021

Problem Solution:

In this program, we will create a HashSet to store integer items, and then we will add and remove items from the HashSet.

Program/Source Code:

The source code to find the length of HashSet is given below. The given program is compiled and executed successfully.

// Rust program to remove an item 
// from HashSet

use std::collections::HashSet;
use std::io;

fn main() {
    let mut set:HashSet<i32> = HashSet::new();
    let mut item:i32=0;
    let mut input = String::new();

    set.insert(10);
    set.insert(20);
    set.insert(30);
    set.insert(40);
    set.insert(50);
    
    println!("HashSet before removing item: \n{:?}",set);
    
    println!("Enter Item: ");
    io::stdin().read_line(&mut input).expect("Not a valid string");
    item = input.trim().parse().expect("Not a valid number");
    
    set.remove(&item);
    
    println!("HashSet after removing item: \n{:?}",set);
}

Output:

HashSet before removing item: 
{20, 10, 40, 50, 30}
Enter Item: 
40
HashSet after removing item: 
{20, 10, 50, 30}

Explanation:

Here, we created a HashSet to store integer elements. Then we added items using the insert() method and removed the item from HashSet using the remove() method. After that, we printed updated HashSet.

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