The Magic (and Gotchas) of Vue.js Reactivity: How It Knows Exactly What to Update
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The Magic (and Gotchas) of Vue.js Reactivity: How It Knows Exactly What to Update If you've used Vue.js, you've probably experienced that "wow" moment: you change a variable and the UI updates automatically. No setState, no massive useEffect chains, no manual subscriptions. It feels like magic. But it's not magic — it's a beautifully engineered reactivity system. And behind that simplicity lies one of the most interesting technical implementations in modern frontend frameworks.