calculadora

Script
function calculate(a, b, operation) {
  if (operation === 'add') {
    return a + b;
  }
  else if (operation === 'subtract') {
    return a - b;
  }
  else if (operation === 'multiply') {
    return a * b;
  }
  else if (operation === 'divide') {
    return a / b;
  }
}

calculate(2, 4, 'multiply') # 8