function basicOp(operation, value1, value2)
{
  var cases = {
    '+': value1 + value2,
    '-': value1 - value2,
    '*': value1 * value2,
    '/': value1 / value2
  };
  return cases[operation]
}



// Ejemplo de uso:
console.log(basicOp('+', 5, 3)); // Output: 8
console.log(basicOp('-', 5, 3)); // Output: 2
console.log(basicOp('*', 5, 3)); // Output: 15
console.log(basicOp('/', 6, 3)); // Output: 2