How to check if a Vector contains all the items of Another Vector in Rust - Step by Step Examples

How to check if a Vector contains all the items of Another Vector in Rust ?

Answer

To check if a vector contains all the items of another vector in Rust, you can use the iter method combined with the all method.

✐ Examples

1 Check if All Elements of an Integer Vector are in the First Vector

In this example,

We create a vector named vec1 with a set of numerical values.
We create another vector named vec2 with a different set of numerical values.
We use the iter method on vec2 to get an iterator over the elements of vec2.
We use the all method on the iterator to check if all elements of vec2 are present in vec1. The all method takes a closure that checks if each element of vec2 is contained in vec1 using the contains method.
The all method returns true if all elements of vec2 are in vec1; otherwise, it returns false.
Finally, we print the result to standard output using the println! macro.

Rust Program

fn main() {
    let vec1 = vec![1, 2, 3, 4, 5];
    let vec2 = vec![2, 3, 4];
    let result = vec2.iter().all(|&item| vec1.contains(&item));
    println!("{}", result);
}

Output

true

2 Check if All Elements of a String Vector are in the First Vector

In this example,

We create a vector named main_vec with a series of character strings.
We create another vector named sub_vec with a subset of character strings.
We use the iter method on sub_vec to get an iterator over the elements of sub_vec.
We use the all method on the iterator to check if all elements of sub_vec are present in main_vec. The all method takes a closure that checks if each element of sub_vec is contained in main_vec using the contains method.
The all method returns true if all elements of sub_vec are in main_vec; otherwise, it returns false.
Finally, we print the result using the println! macro.

Rust Program

fn main() {
    let main_vec = vec!["apple", "banana", "cherry", "date", "fig"];
    let sub_vec = vec!["banana", "cherry", "date"];
    let result = sub_vec.iter().all(|&item| main_vec.contains(&item));
    println!("{}", result);
}

Output

true

3 Check if All Elements of a Subset Vector are in the Main Vector

In this example,

We create a vector named primary_vec with a list of mixed data types including numbers and strings.
We create another vector named secondary_vec with some elements that are not present in primary_vec.
We use the iter method on secondary_vec to get an iterator over the elements of secondary_vec.
We use the all method on the iterator to check if all elements of secondary_vec are present in primary_vec. The all method takes a closure that checks if each element of secondary_vec is contained in primary_vec using the contains method.
Since not all elements of secondary_vec are in primary_vec, the all method returns false.
Finally, we print the result using the println! macro.

Rust Program

fn main() {
    let primary_vec = vec![10, 20, 30, "apple", "banana"];
    let secondary_vec = vec![20, "banana", "cherry"];
    let result = secondary_vec.iter().all(|&item| primary_vec.contains(&item));
    println!("{}", result);
}

Output

false

Summary

In this tutorial, we learned How to check if a Vector contains all the items of Another Vector in Rust language with well detailed examples.

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