react state how to add new array elelment code example

Example 1: add new array at the back of react state

this.setState(prevState => ({
  myArray: ["new value", ...prevState.myArray]
}))

Example 2: add new array at the back of react state

this.setState(prevState => ({
  myArray: [...prevState.myArray, {"name": "object"}]
}))