This tutorial explains what is different and special about a functional programmer's approach, and demonstrates how to implement JavaScript functions from a functional programming point of view. It ...

For example, using closures along with higher-order functions used to be the only way we could have “private” or tamper-proof variables in JavaScript: let protectedObject = (function() { ...

JavaScript secret No. 3: Invoking functions After understanding the most common way to invoke a function (using the parentheses operator), it’s time to learn how to use call and apply.