How to get Last N Items from a Vector in Rust - Step by Step Examples

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How to get Last N Items from a Vector in Rust ?

Answer

To get the last N items from a vector in Rust, you can use array slicing in combination with the length of the vector.

✐ Examples

1 Get Last N Items from Vector

In this example,

First, you define a vector containing the elements from which you want to retrieve the last N items.
Next, you calculate the starting index for the last N items by subtracting N from the length of the vector.
Finally, you retrieve the elements using the calculated starting index to the end of the vector.

Rust Program

fn main() {
    // Define a vector containing elements
    let vector = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

    // Specify the number of items to retrieve (N)
    let n = 5;

    // Calculate the starting index for the last N items
    let start_index = vector.len() - n;

    // Retrieve the last N items from the vector
    let last_n_items = &vector[start_index..];

    // Print the last N items
    println!("{:?}", last_n_items);
}

Output

[6, 7, 8, 9, 10]

2 Get Last Three Items from String Vector

In this example,

Define a vector containing strings.
Calculate the starting index for the last three items by subtracting three from the length of the string vector.
Retrieve the last three items using array slicing with the calculated starting index to the end of the string vector.

Rust Program

fn main() {
    // Define a vector containing strings
    let string_vector = vec!["apple", "banana", "orange", "grape", "kiwi"];

    // Calculate the starting index for the last three items
    let start_index = string_vector.len() - 3;

    // Retrieve the last three items from the string vector
    let last_three_items = &string_vector[start_index..];

    // Print the last three items
    println!("{:?}", last_three_items);
}

Output

["orange", "grape", "kiwi"]

Summary

In this tutorial, we learned How to get Last N Items from a Vector in Rust language with well detailed examples.

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How to get Last N Items from a Vector in Rust - Step by Step Examples

How to get Last N Items from a Vector in Rust ?

Answer

✐ Examples

1 Get Last N Items from Vector

Rust Program

Output

2 Get Last Three Items from String Vector

Rust Program

Output

Summary

More Rust Vectors Tutorials