Correct modification of state arrays in React.js

Easiest, if you are using ES6.

initialArray = [1, 2, 3];

newArray = [...initialArray, 4]; // --> [1,2,3,4]

New array will be [1,2,3,4]

to update your state in React

this.setState({
  arrayvar: [...this.state.arrayvar, newelement]
});

Learn more about array destructuring

The simplest way with ES6:

this.setState(prevState => ({
    array: [...prevState.array, newElement]
}))

Currently so many people facing problem to update the useState hook state. I use this approach to update it safely and wanted to share it here.

This is my state

const [state, setState] = useState([])

Suppose I have a object name obj1 and I want it to append in my state. I will suggest to do it like this

setState(prevState => ([...prevState, obj1]))

This will safely insert the object at the end and also keep the state consistency

React may batch updates, and therefore the correct approach is to provide setState with a function that performs the update.

For the React update addon, the following will reliably work:

this.setState(state => update(state, {array: {$push: [4]}}));

or for concat():

this.setState(state => ({
    array: state.array.concat([4])
}));

The following shows what https://jsbin.com/mofekakuqi/7/edit?js,output as an example of what happens if you get it wrong.

The setTimeout() invocation correctly adds three items because React will not batch updates within a setTimeout callback (see https://groups.google.com/d/msg/reactjs/G6pljvpTGX0/0ihYw2zK9dEJ).

The buggy onClick will only add "Third", but the fixed one, will add F, S and T as expected.

class List extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      array: []
    }
    setTimeout(this.addSome, 500);
  }

  addSome = () => {
    this.setState(
      update(this.state, {array: {$push: ["First"]}}));
    this.setState(
      update(this.state, {array: {$push: ["Second"]}}));
    this.setState(
      update(this.state, {array: {$push: ["Third"]}}));
  };

  addSomeFixed = () => {
    this.setState( state => 
      update(state, {array: {$push: ["F"]}}));
    this.setState( state => 
      update(state, {array: {$push: ["S"]}}));
    this.setState( state => 
      update(state, {array: {$push: ["T"]}}));
  };

  render() {
    const list = this.state.array.map((item, i) => {
      return <li key={i}>{item}</li>
    });
    console.log(this.state);

    return (
      <div className='list'>
        <button onClick={this.addSome}>add three</button>
        <button onClick={this.addSomeFixed}>add three (fixed)</button>
        <ul>
        {list}
        </ul>
      </div>
    );
  }
};

ReactDOM.render(<List />, document.getElementById('app'));

If you are using functional components in React

const [cars, setCars] = useState([{
  name: 'Audi',
  type: 'sedan'
}, {
  name: 'BMW',
  type: 'sedan'
}])

...

const newCar = {
  name: 'Benz',
  type: 'sedan'
}

const updatedCarsArray = [...cars, newCar];

setCars(updatedCarsArray);

As @nilgun mentioned in the comment, you can use the react immutability helpers. I've found this to be super useful.

From the docs:

Simple push

var initialArray = [1, 2, 3];
var newArray = update(initialArray, {$push: [4]}); // => [1, 2, 3, 4]

initialArray is still [1, 2, 3].

If you are using functional component please use this as below.

const [chatHistory, setChatHistory] = useState([]); // define the state

const chatHistoryList = [...chatHistory, {'from':'me', 'message':e.target.value}]; // new array need to update
setChatHistory(chatHistoryList); // update the state

this.setState(preState => ({ arrayvar: [...prevState.arrayvar,newelement] }))

This will work to solve this problem.

For added new element into the array, push() should be the answer.

For remove element and update state of array, below code works for me. splice(index, 1) can not work.

const [arrayState, setArrayState] = React.useState<any[]>([]);
...

// index is the index for the element you want to remove
const newArrayState = arrayState.filter((value, theIndex) => {return index !== theIndex});
setArrayState(newArrayState);

What I do is update a value outside the state and do a forceupdate(), the less stuff managed by react the better since you have more control over what is updated. Also creating a new array for every update may be too expensive if the updates are fast

First method is for class components second is for functional components

   constructor (props){
        super();
        this.state = {
          quote : [],
        }
    
      this.setState({
        quote : [...this.state.quote , newObj]
      })



    const [quote, setQuote] = useState([])
    setQuote(prevState => [...prevState, newObj])

Here's a 2020, Reactjs Hook example that I thought could help others. I am using it to add new rows to a Reactjs table. Let me know if I could improve on something.

Adding a new element to a functional state component:

Define the state data:

const [data, setData] = useState([
  { id: 1, name: 'John', age: 16 },
  { id: 2, name: 'Jane', age: 22 },
  { id: 3, name: 'Josh', age: 21 },
]);

Have a button trigger a function to add a new element

<Button
  // pass the current state data to the handleAdd function so we can append to it.
  onClick={() => handleAdd(data)}>
  Add a row
</Button>

function handleAdd(currentData) {
  // return last data array element
  let lastDataObject = currentTableData[currentTableData.length - 1]

  // assign last elements ID to a variable.
  let lastID = Object.values(lastDataObject)[0] 

  // build a new element with a new ID based off the last element in the array
  let newDataElement = {
    id: lastID + 1,
    name: 'Jill',
    age: 55,
  }

  // build a new state object 
  const newStateData = [...currentData, newDataElement]

  // update the state
  setData(newStateData);

  // print newly updated state
  for (const element of newStateData) {
    console.log('New Data: ' + Object.values(element).join(', '))
  }
}

I am trying to push value in an array state and set value like this and define state array and push value by map function.

this.state = {
  createJob: [],
  totalAmount: Number = 0,
}

your_API_JSON_Array.map((_) => {
  this.setState({ totalAmount:this.state.totalAmount += _.your_API_JSON.price })
  this.state.createJob.push({ id: _._id, price: _.your_API_JSON.price })
  return this.setState({ createJob: this.state.createJob })
})

I was having a similar issue when I wanted to modify the array state while retaining the position of the element in the array.

This is a function to toggle between like and unlike:

const liker = (index) => {
  setData((prevState) => {
    prevState[index].like = ! prevState[index].like;
    return [...prevState];
  });
}

As we can say the function takes the index of the element in the array state, and we go ahead and modify the old state and rebuild the state tree.

This worked for me to add an array within an array

this.setState(prevState => ({
    component: prevState.component.concat(new Array(['new', 'new']))
}));

//get the value you want to add
const valor1 = event.target.elements.valor1.value;

//add in object 
        const todo = {
            valor1,
        }

//now you just push the new value into the state

//prevlista is the value of the old array before updating, it takes the old array value makes a copy and adds a new value

setValor(prevLista =>{
return prevLista.concat(todo) })