what are some good javascript coding challenges to practice?

As a programmer, mastering coding challenges is an essential part of increasing knowledge and expertise. javascript coding challenges provide an excellent way to test your programming skills, problem-solving abilities, and even creativity. With the emergence of online coding challenge platforms, it is easier than ever to practice coding with JavaScript.

1. CodeWars: CodeWars is great for practicing various JavaScript algorithms and data structures. The user-base on the platform provides support to get help when stuck on certain challenges. It also allows coders to challenge themselves by competing with others in different difficulty levels, from novice (8 kyu) to extraordinary (1 kyu).

2. HackerRank: HackerRank is a suitable platform for aspiring coders who are looking to practice their JavaScript skills in a real-world environment. The site contains different types of problems that range from basic algorithm trajectories to complex coding puzzles with constraints and limitations that must be adhered to for problem solving.

3. Project Euler: Project Euler is a platform created for mathematicians and programmers alike who are looking to improve their problem-solving skills using mathematics mixed with programming languages, such as JavaScript. Problems found on this website are meant to be challenging and require some thinking outside the box in order to solve them in an elegant way without reinventing the wheel too much by directly "coding" the solutions without understanding why or how it works in greater detail.

4. FreeCodeCamp: FreeCodeCamp has become one of the most popular websites for those learning programming languages such as JavaScript quickly in an efficient manner. It contains exercises dedicated specifically to learn various aspects of this language ranging from basic fundamentals up until being able completing real world tasks like building applications with it through project completion workflows (hackathon styles).