From the course: HTML, CSS, and JavaScript: Building the Web
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Understanding closures
From the course: HTML, CSS, and JavaScript: Building the Web
Understanding closures
- [Instructor] Welcome back. Today we're going to learn about closures in JavaScript. Closures are a powerful feature that allow an inner function to access variables from its outer function. This is especially useful for managing state and keeping track of data over time. Let's learn a little bit more about closures. A closure is a function that remembers the variables from the place where it was created, even when the function is executed in a different context. Think of it like a backpack. When the function is created, it packs some variables in its backpack. No matter where the function goes, it carries those variables with it. Let's talk about why we need closures. I mentioned before that closures allow us to keep track of data over time, and this is really key in situations where we're working with asynchronous operations, which we'll learn about a little later, or when dealing with event listeners. In our draggable terrarium, we need to keep track of the position of the mouse…
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