/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 vote155 views1 answer
React fetch request with content type x-www-form-urlencoded
Javascript React
0 vote128 views1 answer
Dull a background image in react native
Javascript React
0 vote160 views1 answer
As it does not contain a package.json file. react
Javascript React
0 vote148 views1 answer
Start to work with a pre existing react projects
Javascript React
-2 votes148 views1 answer
React native generate signed apk getting older version
Javascript React
0 vote150 views1 answer
Bottom shadow in react native
Javascript React
1 vote147 views1 answer
Implementating step component in react
Javascript React
0 vote149 views1 answer
React-active link
Javascript React
0 vote150 views1 answer
Get call log in react native with filter android
Javascript React
0 vote148 views1 answer
How to get domain name in react
Javascript React