rustHow to sort a Rust slice by key?

Slices in Rust can be sorted using the sort_by method. This method takes a closure as an argument which is used to compare two elements of the slice. The closure should return Ordering::Less if the first element should appear before the second, Ordering::Greater if the second element should appear before the first, and Ordering::Equal if the two elements are equal.

Example

let mut v = vec![3, 2, 1];
v.sort_by(|a, b| a.cmp(b));

Output example

[1, 2, 3]

Code explanation

• let mut v = vec![3, 2, 1];: creates a mutable vector v with elements 3, 2, and 1.
• v.sort_by(|a, b| a.cmp(b));: sorts the vector v using the sort_by method, which takes a closure as an argument. The closure compares two elements a and b using the cmp method, which returns Ordering::Less if a is less than b, Ordering::Greater if a is greater than b, and Ordering::Equal if a is equal to b.

Helpful links

• Rust Slices
• Rust sort_by
• Rust cmp

Edit this code on GitHub