JavaScript
What Is JavaScript, and Why Is It Everywhere?
JavaScript and Java are basically unrelated. Here's what JavaScript actually is, and why it ended up everywhere.
Tutorials
All tutorials
JavaScript
var, let and const: Why JavaScript Has Three Ways to Make a Variable
const doesn't mean frozen, and var leaks out of if blocks in a way that trips up almost everyone once.
JavaScript
Functions, Arrow Functions, and What Scope Actually Means
Arrow functions aren't just shorter syntax. The real difference is how they handle this, and it matters.
JavaScript
Arrays and Objects: JavaScript's Two Workhorses
Almost every piece of data in JavaScript ends up as an array, an object, or arrays and objects nested together.
JavaScript
The DOM: How JavaScript Actually Touches the Page
HTML describes a page at load time. The DOM is what JavaScript actually reaches into to change it live.
JavaScript
Promises and async/await: Dealing with Things That Take Time
A Promise is basically a receipt: you don't have the result yet, but you're guaranteed either a result or an error.
JavaScript
Events and Event Listeners, Beyond Just Clicks
Clicking a button is the example everyone starts with, but JavaScript can react to a lot more than clicks.
JavaScript
Talking to a Server with fetch
fetch doesn't treat a 404 as a failure the way you would expect. Here's the check almost everyone forgets.