Global State
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React state
In the React state, all of the state was held and modified within the same React component, which also happened to be the top-level application component. In most applications, the state will need to be accessed from multiple components, and those components may need to modify the state. How should this state be organized and managed?
As a programming principle, it’s important to avoid having multiple, mutable copies of the same state, because the challenges of keeping them synchronized outweigh any possible advantages. It would be best ...