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If you’ve been diving deep into JavaScript, chances are you’ve encountered scenarios where you need to augment or modify the behavior of functions. This is where function decorators come into play.
They’re like handy tools in a programmer’s toolbox, allowing you to enhance functions with additional functionalities in a clean and reusable manner.
Understanding Function Decorators
At its core, a function decorator is simply a higher-order function that takes one function and returns another function, typically augmenting the behavior of the original function in some way. This concept might sound complex, but fear not, we’ll break it down with some straightforward examples.
Example 1: Logging Decorator
Let’s start with a practical example. Imagine you have a function that calculates the square of a number:
function square(x) {
return x * x;
}Now, suppose you want to log every time this function is called along with its arguments and return value. Here’s where a decorator can come in handy:
