add new array at the back of react state

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