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okay, let's dive into the world of angular signals, explore their potential to replace zone.js, and understand how this shift might impact component design.

*understanding angular signals*

at their core, angular signals are a reactive programming primitive. they represent a value that changes over time, and they automatically notify interested consumers when that value changes. this "reactivity" is what makes them so powerful.

*key concepts*

*signal:* a function that holds a value. you can `get` the value of a signal (read-only) and `set` the value of a signal (mutable). signals are at the heart of the reactivity system.

*writablesignal:* a specific type of signal that can be both read and written to. you can use the `set()` method to change its value directly or the `update()` method to modify the value based on its current state.

*computed:* a signal whose value is derived from one or more other signals. when the dependencies of a computed signal change, the computed signal automatically re-calculates its value. computed signals are read-only.

*effect:* a function that runs whenever one or more signal values change. effects allow you to perform side effects based on signal changes (e.g., logging, updating the dom imperatively, etc.). use effects sparingly as they can create complex code if not handled carefully.

*why signals matter (and their zone.js implications)*

angular has historically relied heavily on zone.js to detect changes in the application. zone.js is a complex library that monkey-patches various browser apis to intercept asynchronous operations (e.g., `settimeout`, `addeventlistener`, promise resolution, etc.). when one of these patched apis triggers, zone.js triggers angular's change detection cycle.

while zone.js has been essential for angular's automatic change detection, it also has some drawbacks:

*performance overhead:* monkey-patching adds overhead to every asynchronous operation, even if ...

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