How to Iterate Over a Vector in Reverse Order in Rust - Step by Step Examples

How to Iterate Over a Vector in Reverse Order in Rust ?

Answer

To iterate over a vector in reverse order in Rust, you can use the .iter().rev() method, which provides an iterator yielding references to the elements of the vector in reverse order.

✐ Examples

1 Iterate Over a Numeric Vector in Reverse Order

In this example,

We create a vector named num_vec containing several numeric values.
We use the iter().rev() method to obtain a reverse iterator over the elements of num_vec.
We then iterate over the reverse iterator using a for loop, which allows us to access each element of the vector in reverse order.
Inside the loop, we print each element, effectively traversing the vector in reverse order.

Rust Program

fn main() {
    let num_vec = vec![10, 20, 30, 40, 50];
    for num in num_vec.iter().rev() {
        println!("{}", num);
    }
}

Output

2 Iterate Over a String Vector in Reverse Order

In this example,

We create a vector named str_vec containing several string values.
We use the iter().rev() method to obtain a reverse iterator over the elements of str_vec.
We then iterate over the reverse iterator using a for loop, allowing us to access each string element of the vector in reverse order.
Inside the loop, we print each string, effectively traversing the vector in reverse order.

Rust Program

fn main() {
    let str_vec = vec!["apple", "banana", "cherry", "date"];
    for s in str_vec.iter().rev() {
        println!("{}", s);
    }
}

Output

date
cherry
banana
apple

Summary

In this tutorial, we learned How to Iterate Over a Vector in Reverse Order in Rust language with well detailed examples.

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How to Iterate Over a Vector in Reverse Order in Rust - Step by Step Examples

How to Iterate Over a Vector in Reverse Order in Rust ?

Answer

✐ Examples

1 Iterate Over a Numeric Vector in Reverse Order

Rust Program

Output

2 Iterate Over a String Vector in Reverse Order

Rust Program

Output

Summary

More Rust Vectors Tutorials