JAVASCRIPT

push state array react

setArray(oldArray => [...oldArray,newValue] );

push data to state array react usestate

const {useState, useCallback} = React;
function Example() {
    const [theArray, setTheArray] = useState([]);
    const addEntryClick = () => {
        setTheArray(oldArray => [...oldArray, `Entry ${oldArray.length}`]);
    };
    return [
        <input type="button" onClick={addEntryClick} value="Add" />,
        <div>{theArray.map(entry =>
          <div>{entry}</div>
        )}
        </div>
    ];
}

ReactDOM.render(
    <Example />,
    document.getElementById("root")
);

push values to state array class react

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

add object in array state react

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

add object in array state react

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

Correct way to push into state array

stackoverflow:https://stackoverflow.com/questions/37435334/correct-way-to-push-into-state-array

add array of object to state react

var joined = this.state.myArray.concat('new value');
this.setState({ myArray: joined })