10 exercises found
Learn how giants like YouTube use smart prediction to cache content before anyone asks for it.
Every website is built with three languages working together — and JavaScript is the one that makes things actually happen.
JavaScript started in browsers, but today it powers servers, mobile apps, and even desktop software — one language, endless possibilities.
map() is at its most powerful when transforming arrays of objects — extracting fields, adding properties, or reformatting data.
Where filter() really shines is selecting items from arrays of objects based on any property or combination of properties.
Destructuring lets you extract properties from an object into separate variables with a single, clean line of code.
You can destructure directly in function parameters. Instead of passing an entire object and picking it apart inside, you extract what you need right in the parameter list.
Template literals use backticks instead of quotes. They let you embed variables directly in strings, write multi-line strings, and never worry about string concatenation again.
Once you know the page is a tree, you can move around it the way you move around a folder structure. This is what every UI framework is doing under the hood.
A browser doesn't do things to your code. It waits, and when something happens, it asks your code if it wants to react. Understanding this flips how you think about UI code.