add new array at the back of react state

1this.setState(prevState => ({
2  myArray: [...prevState.myArray, "new value"]
3}))
4

1this.setState(prevState => ({
2  myArray: ["new value", ...prevState.myArray]
3}))
4

1this.setState(prevState => ({
2  myArray: [...prevState.myArray, {"name": "object"}]
3}))
4

1this.setState(prevState => ({
2  myArray: [ {"name": "object"}, ...prevState.myArray]
3}))
4