Learn how to create a callback function in JavaScript and use it for various purposes, such as asynchronous programming, modularity, flexibility, and custom events.

In JavaScript, functions are the hidden but secretly powerful bones of your stacks. In this course, author Ray Villalobos explains how functions work, how they're declared, and how you can invoke them ...

💡Tip: In JavaScript, functions can be stored in variables, passed into other functions as arguments, passed out of functions as return values, and constructed at run-time. The syntax of the function ...

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.

In JavaScript, though, the same code is perfectly fine: This is because JavaScript scopes your variables to functions and not to if-blocks. But, we can achieve block-like scope through the use of ...