/Javascript/React/React update state array of objects

React 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

Update object in array state react

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

Source: dev.to

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

Similar codes

1 vote262 views1 answer
React native create view dynamically
Javascript React
11 votes285 views2 answers
How to refresh the page using react
Javascript React
2 votes266 views1 answer
Site cannot be accessed broken link or url that doesn’t exist react netlify
Javascript React
1 vote275 views1 answer
SFC in react
Javascript React
0 vote277 views1 answer
User account in react
Javascript React
0 vote257 views1 answer
Unexpected token react
Javascript React
1 vote263 views1 answer
React js console log not working
Javascript React
0 vote320 views1 answer
React include a polyfill webpack v5
Javascript React
0 vote275 views1 answer
Chromepicker react-color not working
Javascript React
0 vote271 views3 answers
React animation
Javascript React