react native update state array of objects
let markers = [ ...this.state.markers ];
markers[index] = {...markers[index], key: value};
this.setState({ markers });react native update state array of objects
let markers = [ ...this.state.markers ];
markers[index] = {...markers[index], key: value};
this.setState({ markers });react how to update state array
const initialState = [
{ name: "foo", counter: 0 },
{ name: "far", counter: 0 },
{ name: "faz", counter: 0 }
];
const [state, setState] = useState(initialState);
const clickButton = () => {
// 1. Make a shallow copy of the array
let temp_state = [...state];
// 2. Make a shallow copy of the element you want to mutate
let temp_element = { ...temp_state[0] };
// 3. Update the property you're interested in
temp_element.counter = temp_element.counter+1;
// 4. Put it back into our array. N.B. we *are* mutating the array here, but that's why we made a copy first
temp_state[0] = temp_element;
// 5. Set the state to our new copy
setState( temp_state );
}how to update react state array
const [array, setArray] = useState([1, 2, 3])
// Add
setArray(prevArray => [...prevArray, 4]); // -> [1, 2, 3, 4]
// Remove last entry
setArray(prevArray => prevArray.splice(0, prevArray.length - 1)); // -> [1, 2, 3]Copyright © 2021 Codeinu
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