Learn JavaScript: The best free and paid online courses and tutorials. JavaScript makes the web go around. By Dieter Holger. Aug 21, 2018 4:00 am PDT. Image: Getty Images/Hanieriani.

If you write JavaScript, you have probably used higher-order functions and not even noticed. If you have ever replaced a for loop with an array method, you’ve used higher-order functions.

Thau's JavaScript Tutorial. There’s a lot you can do with JavaScript: Images can swap when you move a mouse over them, form elements can influence each other on the fly, ...