How to check if a Specific Item is present in the Set in Rust - Step by Step Examples

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How to check if a Specific Item is present in the Set in Rust ?

Answer

To check if a specific item is present in a Set in Rust, you can use the contains method.

✐ Examples

1 Check if Item is Present

In this example,

We define a HashSet named my_set containing elements of a specific type.
We use the contains method of the HashSet to check if a specific item is present.
The contains method returns true if the item is present in the HashSet, otherwise it returns false.
Finally, we print the result to standard output.

Rust Program

use std::collections::HashSet;

fn main() {
    // Define HashSet with items
    let mut my_set = HashSet::new();
    my_set.insert("apple");
    my_set.insert("banana");
    my_set.insert("orange");
    my_set.insert("grape");
    my_set.insert("melon");

    // Check if item is present
    let item = "banana";
    let is_present = my_set.contains(item);

    // Print result
    println!("Is {} present in the Set? {}", item, is_present);
}

Output

Is banana present in the Set? true

2 Check if Item is Not Present

In this example,

We define a HashSet named my_set containing elements of a specific type.
We use the contains method of the HashSet to check if a specific item is not present.
The contains method returns false if the item is not present in the HashSet.
Finally, we print the result to standard output.

Rust Program

use std::collections::HashSet;

fn main() {
    // Define HashSet with items
    let mut my_set = HashSet::new();
    my_set.insert("apple");
    my_set.insert("banana");
    my_set.insert("orange");
    my_set.insert("grape");
    my_set.insert("melon");

    // Check if item is not present
    let item = "peach";
    let is_not_present = !my_set.contains(item);

    // Print result
    println!("Is {} not present in the Set? {}", item, is_not_present);
}

Output

Is peach not present in the Set? true

Summary

In this tutorial, we learned How to check if a Specific Item is present in the Set in Rust language with well detailed examples.

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