Build a Frontend Web Framework (From Scratch)

The virtual DOM acts as a blueprint for the application's view, allowing developers to describe UI declaratively and letting the framework efficiently manage DOM updates. [1]

By comparing two virtual DOM trees, the reconciliation algorithm finds and applies only the minimal set of changes needed to update the real DOM, greatly improving performance. [1] [2]

Stateful components maintain their own internal state and lifecycle, updating their view when state or props change, unlike pure functions which have no side effects. [1]

Parent components pass data to children via props, while children communicate back by emitting events that parents can subscribe to. [1] [2]

Props allow data to flow down from parent to child components, and events enable children to notify parents of actions, supporting complex, interactive interfaces. [1]

Lifecycle hooks such as onMounted and onUnmounted are scheduled asynchronously, allowing developers to run code at key moments in a component's life. [1] [2]

The scheduler queues and executes lifecycle hooks and other jobs as microtasks, ensuring efficient and predictable updates without blocking rendering. [1]

By using a nextTick() function to schedule and test async updates, you can reliably test components that depend on asynchronous operations. [1]

Keys help the framework efficiently track and update list items, preventing bugs and unnecessary DOM operations during reordering or updates. [1]

Readers can dive into TypeScript integration, server-side rendering, compiling HTML templates, slots for content projection, and building browser extensions for debugging. [1] [2]