How to Sort an Array in Descending Order in Rust - Step by Step Examples

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How to Sort an Array in Descending Order in Rust ?

Answer

To sort an array in descending order in Rust, you can use the `sort_by` method with a custom comparison function.

✐ Examples

1 Sort Array of Integers in Descending Order

In this example,

Create a mutable vector of integers, for example, numbers.
Define a custom comparison function that compares two integers in descending order.
Use the sort_by method with the custom comparison function to sort the vector of integers in descending order.
Print the sorted vector to see the result.

Rust Program

fn main() {
    let mut numbers = vec![5, 2, 8, 1, 9];
    numbers.sort_by(|a, b| b.cmp(a));
    println!("Sorted array in descending order: {:?}", numbers);
}

Output

Sorted array in descending order: [9, 8, 5, 2, 1]

2 Sort Array of Strings in Descending Order

In this example,

Create a mutable vector of strings, for example, words.
Define a custom comparison function that compares two strings in descending order.
Use the sort_by method with the custom comparison function to sort the vector of strings in descending order.
Print the sorted vector to see the result.

Rust Program

fn main() {
    let mut words = vec!["apple", "banana", "cherry", "date"];
    words.sort_by(|a, b| b.cmp(a));
    println!("Sorted array in descending order: {:?}", words);
}

Output

Sorted array in descending order: [date, cherry, banana, apple]

Summary

In this tutorial, we learned How to Sort an Array in Descending Order in Rust language with well detailed examples.

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