our React components follow this cycle as well: they’re created (mounted on the DOM), they experience growth (by updating) and they die (unmounted from the DOM). This is the component lifecycle! Within the lifecycle of a component, there are different phases. These phases each have their own lifecycle methods. Lets now take a look at these methods. The Lifecycle Methods A component’s lifecycle can be broken down into four parts:
- Initialization
- Mounting
- Updating
- Unmounting
componentDidMount, render, constructor, componentWillUnmount, React Updates:
The order for the previous methods is:
constructor
render
componentDidMount
React Updates
componentWillUnmount
componentDidMount() is a hook that gets
invoked right after a React component has
been mounted aka after the first render() lifecycle.
only be triggered if a component's state has changed. The state can change from a props change, or from a direct setState change. The component gets the updated state and React decides if it should re-render the component.
- In a React component, props are variables passed to it by its parent component. State on the other hand is still variables, but directly initialized and managed by the component. The state can be initialized by props
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