calculator

function calculator(operator: string, num1: number, num2: number) {
  if (operator === 'add') {
    return num1 + num2;
  } else if (operator === 'subtract') {
    return num1 - num2;
  } else if (operator === 'multiply') {
    return num1 * num2;
  } else if (operator === 'divide') {
    return num1 / num2;
  }
}