What is MobX observer?

The observer HoC automatically subscribes React components to any observables that are used during rendering. As a result, components will automatically re-render when relevant observables change. It also makes sure that components don’t re-render when there are no relevant changes.

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What are MobX actions?

An action is any piece of code that modifies the state. In principle, actions always happen in response to an event. For example, a button was clicked, some input changed, a websocket message arrived, etc. MobX requires that you declare your actions , although makeAutoObservable can automate much of this job.

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