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

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

Answer

To get the first N items from a vector in Rust, you can use array slicing.

✐ Examples

1 Get First N Items from Vector

In this example,

First, you define a vector containing the elements from which you want to retrieve the first N items.
Next, you specify the range for the first N items using array slicing. Rust uses zero-based indexing, so to select the first N items, you use the range from 0 to N-1.
Finally, you retrieve the elements using the specified range.

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;

    // Retrieve the first N items from the vector
    let first_n_items = &vector[0..n];

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

Output

[1, 2, 3, 4, 5]

2 Get First Three Items from String Vector

In this example,

Define a vector containing strings.
Specify the range from 0 to 2 to retrieve the first three items from the string vector.
Retrieve the first three items using array slicing.

Rust Program

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

    // Specify the range to retrieve the first three items
    let range = 0..3;

    // Retrieve the first three items from the string vector
    let first_three_items = &string_vector[range];

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

Output

["apple", "banana", "orange"]

Summary

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

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

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

Answer

✐ Examples

1 Get First N Items from Vector

Rust Program

Output

2 Get First Three Items from String Vector

Rust Program

Output

Summary

More Rust Vectors Tutorials