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how to update react state array

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Wild Wren answered on July 4, 2020 Popularity 1/10 Helpfulness 1/10

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how to update react state array

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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]

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript react-state state

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Contributed on Apr 17 2021

Wild Wren

0 Answers Avg Quality 2/10

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react how to update state array

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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 );
}

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Jan 13 2021

Annoyed Aardvark

0 Answers Avg Quality 2/10

react native update state array of objects

Comment

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

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Jul 04 2020

Blue Beetle

0 Answers Avg Quality 2/10

update object in array state react

Comment

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

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: dev.to

Tags: add

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Contributed on Jul 23 2021

Grieving Gharial

0 Answers Avg Quality 2/10

how to update array state in react

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setArtists( // Replace the state
  [ // with a new array
    ...artists, // that contains all the old items
    { id: nextId++, name: name } // and one new item at the end
  ]
);

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Feb 10 2023

Perfect Pigeon

0 Answers Avg Quality 2/10

react native update state array of objects

Comment

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

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Jul 04 2020

Blue Beetle

0 Answers Avg Quality 2/10

how to update react state array

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