update value of array in s state react code example
Example 1: how to update react state array
const [myArray, setMyArray] = useState([1,2,3])
setMyArray([...myArray, 4]);
Example 2: update object in array state by index
this.setState(({items}) => ({
items: [
...items.slice(0,1),
{
...items[1],
name: 'newName',
},
...items.slice(2)
]
}));
Example 3: react native update state array of objects
let newMarkers = markers.map(el => (
el.name==='name'? {...el, key: value}: el
))
this.setState({ markers });