In functional programming, there are two varieties of functions: first-order functions and pure functions. First-order functions A first-order function takes standard data types (string, number, ...

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.

Of all the hats JavaScript can wear, its form-processing features are among the most sought and used. Learn how to use JavaScript for form processing, validation, and more.