https://www.codewars.com code example

Example 1: codewars

Codewars is an educational community for computer programming.

On the platform, software developers train on programming challenges known as
kata.

These discrete programming exercises train a range of skills in a variety of
programming languages, and are completed within an online integrated
development environment.

Example 2: codewars

one of the best way to practice algorithms and data structures,
I also recommend LeetCode,

Have a nice day learning coding!!