Video: You Can’t Use Hooks Conditionally… or Can You?

Other hooks in React, such as useState or useEffect, cannot be used conditionally because they are stored and executed in a specific order within a linked list. Changing the order by conditionally calling hooks can disrupt the retrieval of their stored states, leading to errors in the application.

The fiber tree in React serves as a memory structure that holds all the information about the components that make up an application. It tracks the components, their props, state, and the relationship between them, enabling efficient updates and re-rendering of the user interface.

In React components, hooks values are stored inside a linked list within each component's fiber. Each hook adds its value to this list, and they are accessed sequentially according to the order in which the hooks are called within the component.

The useContext hook can be used conditionally because it accesses its value from a context object that is located outside of the normal execution flow of other hooks. This isolation from the linked list used by other hooks like useState means its conditional use does not affect the order-dependent operations of other hooks.

Changing a context value in React triggers a re-render of the provider and all downstream components that consume the context. This is efficiently managed through the context provider, ensuring that only components dependent on the context are updated, thereby optimizing performance.

The proposed new hook in React is called the 'Use' hook. Its special ability is that it can be used conditionally, which deviates from the standard rules of hooks that dictate hooks should not be called conditionally.

React tracks component data through a structured system called the fiber tree. Each component is represented as a fiber in the tree, storing properties such as state and props. During re-renders, React updates this tree according to changes and decides which components need re-rendering based on this updated information.