// Factory Function
const MathFn = () => {
  // closures
  const add = (a, b) => a + b;
  const subtract = (a, b) => a - b;

  const multiply = (a, b) => a * b;
  const divide = (a, b) => {
    return b === 0 ? NaN : a / b;
  };

  export { add, subtract, multiply, divide };
};
export default MathFn;