How to change props to state in React Hooks?

Question

In Simple react class component we used to change the props to state this way:

constructor(props) {     super(props)      this.state = {       pitch: props.booking.pitch,       email: props.booking.email,       firstName: props.booking.firstName,       arrivalDate: props.booking.arrivalDate     } }  

But I am not aware of how to do it in new feature as Hooks, but I am trying to do it this way.

const GenerateDescHook = ({ description: initialDesc }) => {   const [description, setDescription] = useState(null)  useEffect(() => {     setDescription(initialDesc)   }, {})   function handleChangeVariance(newVariance) {     setDescription({       ...description,       template: {         ...description.template,         variance_name: newVariance,       },     })   }  } 

Basically, I just need to change description props, which coming from another parent component to turn to state. Pls, could you show me how to do it in new way as Hooks way?

Answer 1

The problem in your code is with {}. UseEffect hook expects and array, not an object. Use [initialDesc] instead.

This is how you reset component state when props change

const GenerateDescHook = ({ description: initialDesc }) => {   const [description, setDescription] = useState(null)    useEffect(() => {     setDescription(initialDesc)   }, [initialDesc]); } 

This is how you initialize component state to prop value on first render only

const GenerateDescHook = ({ description: initialDesc }) => {   const [description, setDescription] = useState(initialDesc); } 

Answer 2

You can pass your initial state as first argument to useState like this:

const GenerateDescHook = ({ description: initialDesc }) => {   const [description, setDescription] = useState(initialDesc)    ...