Introduction: The Problem Before Interceptors Imagine you're building a real-world application. Your API calls need authentication headers on every single request. Your error responses need to refresh
👋 Welcome to Chapter 9! Imagine a user typing in a search box. They type "i", "ip", "iph", "ipho", "iphon", "iphone" — 6 keystrokes in 2 seconds. Do you really want to make 6 API calls? Of course not
👋 Welcome to Chapter 8! Forms are EVERYWHERE in web apps — login, registration, checkout, search, settings. Angular's Reactive Forms are powered by RxJS under the hood. Every FormControl has streams
You type a question. A few seconds later, an answer streams back — fluent, confident, occasionally wrong. Most developers use this every single day without ever asking what's actually happening betwee
"Combining Observables — forkJoin, combineLatest, zip & More" 👋 Welcome to Chapter 7! Real apps rarely get data from just one place. A product page might need: The product details (from /api/produc
JavaScript is single-threaded. One thread. One call stack. One thing at a time. And yet — you've written code that fetches data from an API while animating a loading spinner while handling button clic
👋 Welcome to Chapter 6! You've built beautiful features using Observables. But what happens when the internet goes down? What if the API server crashes? What if the user has no signal? In the real wo