/Javascript/React/How to update a state with an array react

How to update a state with an array react

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

How to update a state with an array react

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]

Similar codes

21 votes295 views4 answers
React memo
Javascript React
-1 vote313 views3 answers
Instalar react native paper
Javascript React
5 votes341 views1 answer
React in laravel
Javascript React
1 vote339 views1 answer
For loop value index react
Javascript React
7 votes375 views3 answers
Install node-sass version for react
Javascript React
0 vote299 views3 answers
Flash effect in react native
Javascript React
0 vote311 views2 answers
React router how to send data
Javascript React
0 vote304 views1 answer
React google login
Javascript React
139 votes482 views6 answers
Creat react app
Javascript React
1 vote392 views1 answer
How to use cookies in react js
Javascript React