React.js Component Lifecycle

Understanding the component lifecycle

lets you perform actions
when a component is created, updated or destroyed.

It also allows you to decide
if a component should be updated at all
and react to props or state changes.

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React.js Component Lifecycle

Lifecycle Phases

React.js Component Lifecycle

Lifecycle Methods

Various methods are executed at specific points in a component's lifecycle.

Initializing

class fields

React.js Component Lifecycle

componentDidMount ( )

mounting

React.js Component Lifecycle

render ( )

* commonly used

* commonly used

constructor ( props )

* commonly used

* rarely used

componentWillMount ( )

* will deprecate

React.js Component Lifecycle

componentWillReceiveProps( )

componentWillUpdate( )

render ( )

updating

shouldComponentUpdate( nextProps , nextState )

componentDidUpdate( prevProps, prevState)

* will deprecate

* will deprecate

getSnapshotBeforeUpdate(prevProps, prevState)

static    getDerivedStateFromProps( nextProps , currentState )

* rarely used

* rarely used

* commonly used

* commonly used

Commit phase

componentWillUnmount ( )

unmounting

React.js Component Lifecycle

componentDidCatch ( )

Error Handling

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React.js Component Lifecycle