How to Sort a Vector in Descending Order in Rust - Step by Step Examples

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How to Sort a Vector in Descending Order in Rust ?

Answer

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

✐ Examples

1 Sort a Numeric Vector in Descending Order

In this example,

We create a mutable vector named vec containing several numeric values.
We call the sort_by method on the vector vec, passing a custom comparison function that sorts elements in descending order. This method sorts the elements of the vector in descending order.
Finally, we print the sorted vector to standard output using the println! macro.

Rust Program

fn main() {
    // Step 1: Create a mutable vector
    let mut vec = vec![5, 2, 8, 3, 9, 1];
    
    // Step 2: Sort the vector in descending order
    vec.sort_by(|a, b| b.cmp(a));
    
    // Step 3: Print the sorted vector
    println!("Sorted vector: {:?}", vec);
}

Output

Sorted vector: [9, 8, 5, 3, 2, 1]

2 Sort a String Vector in Descending Order

In this example,

We create a mutable vector named vec containing several string values.
We call the sort_by method on the vector vec, passing a custom comparison function that sorts elements in descending order based on lexicographic order. This method sorts the elements of the vector in descending order.
Finally, we print the sorted vector to standard output using the println! macro.

Rust Program

fn main() {
    // Step 1: Create a mutable vector
    let mut vec = vec!["apple", "banana", "orange", "grape", "kiwi"];
    
    // Step 2: Sort the vector in descending order
    vec.sort_by(|a, b| b.cmp(a));
    
    // Step 3: Print the sorted vector
    println!("Sorted vector: {:?}", vec);
}

Output

Sorted vector: ["orange", "kiwi", "grape", "banana", "apple"]

Summary

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

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How to Sort a Vector in Descending Order in Rust - Step by Step Examples

How to Sort a Vector in Descending Order in Rust ?

Answer

✐ Examples

1 Sort a Numeric Vector in Descending Order

Rust Program

Output

2 Sort a String Vector in Descending Order

Rust Program

Output

Summary

More Rust Vectors Tutorials