reacthow assign array in class component code example

Example 1: how to update array in react state

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

Example 2: react create array

const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map((number) => number * 2);console.log(doubled);