Component Lifecycle: Mounting

The constructor can access props while componentDidMount cannot
The constructor runs on every update while componentDidMount runs only once
The constructor runs before the component is mounted while componentDidMount runs after mounting
A key difference is that the constructor runs before the component is mounted to the DOM, while componentDidMount runs after the component has been mounted. This means componentDidMount has access to the DOM and can perform operations like measurements, subscriptions, or direct DOM manipulations that require the component to be rendered first.
The constructor cannot initialize state while componentDidMount can