/Javascript/React/React native update state array of objects

React native update state array of objects

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 );
}

Source: stackoverflow.com

React native update state array of objects

let markers = [ ...this.state.markers ];
markers[index] = {...markers[index], key: value};
this.setState({ markers });

Source: stackoverflow.com

React native update state array of objects

let newMarkers = markers.map(el => (
      el.name==='name'? {...el, key: value}: el
))
this.setState({ markers });

Source: stackoverflow.com

Update object in array state react

const handleAdd = (todo) => {
  const newTodos = [...todos];
  newTodos.push(todo);
  setTodos(newTodos);
}

-1

Source: dev.to

Similar codes

0 vote365 views1 answer
React strap documentation
Javascript React
0 vote360 views1 answer
React-router useNavigate
Javascript React
0 vote366 views2 answers
Background transparent react native
Javascript React
1 vote358 views1 answer
Input type email react js-validation
Javascript React
0 vote351 views2 answers
Get data from url using react
Javascript React
0 vote375 views1 answer
Generate qr code react
Javascript React
1 vote390 views1 answer
Is a good idea to add class in react hooks with document.body.addclasslist
Javascript React
0 vote343 views1 answer
Select checkbox raitng in order javascript React
Javascript React
3 votes380 views1 answer
React how to create range
Javascript React
0 vote383 views1 answer
Settimeout react native focus text input
Javascript React