How to create an Empty Vector in Rust - Step by Step Examples

How to create an Empty Vector in Rust ?

To create an empty vector in Rust, you can use the Vec::new method or the vec![] macro.

In this example,

We use the Vec::new method to create an empty vector.
The Vec::new method returns a new vector that is empty and does not allocate memory until elements are added to it.
We assign the result to a variable named empty_vector using the let keyword.
Finally, we print the empty_vector using the println! macro to verify that it is indeed empty.

fn main() {
    let empty_vector: Vec<i32> = Vec::new();
    println!("Empty vector: {:?}", empty_vector);
}

Empty vector: []

In this example,

We use the vec![] macro to create an empty vector.
The vec![] macro creates a new vector that is empty and can hold any type of elements specified in the assignment.
We assign the result to a variable named empty_vector using the let keyword.
Finally, we print the empty_vector using the println! macro to verify that it is indeed empty.

fn main() {
    let empty_vector: Vec<i32> = vec![];
    println!("Empty vector: {:?}", empty_vector);
}

Empty vector: []

In this tutorial, we learned How to create an Empty Vector in Rust language with well detailed examples.