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With Hooks, you can extract stateful logic from a component so it can be tested independently and reused.
Hooks allow you to reuse stateful logic without changing your component hierarchy.
We first have to remove and add it to the DOM in order to update them again.
is the first “Hook” we’ll learn about, but this example is just a teaser. Hooks don’t replace your knowledge of React concepts.
We’ll discuss this more in Building Your Own Hooks.
If you look at a typical React application in React Dev Tools, you will likely find a “wrapper hell” of components surrounded by layers of providers, consumers, higher-order components, render props, and other abstractions.
While we could filter them out in Dev Tools, this points to a deeper underlying problem: React needs a better primitive for sharing stateful logic.
Therefore you should try to defer as much as work as possible to this point.class My Custom Element extends HTMLElement custom Elements.define('my-custom-element', My Custom Element); const my Custom Element = new My Custom Element(); append Child(my Custom Element); append Child(my Custom Element); // result: // 'connected' // 'connected' This lifecycle hook is triggered when the element is removed from the DOM and is the ideal place to add cleanup logic (the code that needs to be executed before the element is destroyed) and to free up resources.
We can use this callback to: With this, we have a very straight-forward way to pass data to our Custom Elements, but there’s one small problem: The attributes are only read when the component is added to the DOM.