Rust Tutorials

How to Remove Item at a Specific Index from a Vector in Rust

How to Remove Item at a Specific Index from a Vector in Rust ?

Answer

To remove an item at a specific index from a vector in Rust, you can use the remove method or by using the split_off method.

✐ Examples

1 Remove Item at Specific Index Using remove Method

In this example,

We start by creating a mutable vector named vec with some integer values.
We specify the index of the item we want to remove and store it in a variable named index_to_remove.
We use the remove method to remove the item at the specified index. The remove method takes the index as an argument and removes the element at that index, shifting all elements after it to the left.
The remove method also returns the removed element, but we can ignore it if not needed.
Finally, we print the modified vector to see the result.

Rust Program

fn main() {
    let mut vec = vec![10, 20, 30, 40, 50];
    let index_to_remove = 2;
    vec.remove(index_to_remove);
    println!("Vector after removing the item at index {}: {:?}", index_to_remove, vec);
}

Output

Vector after removing the item at index 2: [10, 20, 40, 50]

2 Remove Item at Specific Index Using split_off Method

In this example,

We start by creating a mutable vector named vec with some integer values.
We specify the index of the item we want to remove and store it in a variable named index_to_remove.
We use the split_off method to split the vector at the specified index. The split_off method takes an index and splits the vector into two: the original vector contains elements up to (but not including) the specified index, and the method returns a new vector with elements from the specified index onwards.
We then remove the first element of the new vector, which is the item we wanted to remove.
We concatenate the remaining elements of the new vector back to the original vector using the append method.
Finally, we print the modified vector to see the result.

Rust Program

fn main() {
    let mut vec = vec![10, 20, 30, 40, 50];
    let index_to_remove = 2;
    let mut tail = vec.split_off(index_to_remove);
    tail.remove(0);
    vec.append(&mut tail);
    println!("Vector after removing the item at index {}: {:?}", index_to_remove, vec);
}

Output

Vector after removing the item at index 2: [10, 20, 40, 50]

Summary

In this tutorial, we learned How to Remove Item at a Specific Index from a Vector in Rust language with well detailed examples.

◀ Previous Next ▶

Rust Tutorials

Rust How-Tos

How to Remove Item at a Specific Index from a Vector in Rust

How to Remove Item at a Specific Index from a Vector in Rust ?

Answer

✐ Examples

1 Remove Item at Specific Index Using remove Method

Rust Program

Output

2 Remove Item at Specific Index Using split_off Method

Rust Program

Output

Summary

More Rust Vectors Tutorials