export function calculate(a: number, b: number, op: string): number | null {
  // Usa switch para aplicar la operación correspondiente
  switch (op) {
    case "+":
      return a + b;
      break;
    case "-":
      return a - b;
      break;
    case "*":
      return a * b;
      break;
    case "/":
      return a / b;
      break;
    default:
      return null;
  }
}
console.log(calculate(8, 4, "+")); 
console.log(calculate(8, 4, "-")); 
console.log(calculate(8, 4, "*")); 
console.log(calculate(8, 4, "/"));
console.log(calculate(8, 4, "^")) ;