index.js

const num1 = 10
const num2 = 5

function add(a) {
  return a + b
}

function subtract(a, b) {
  return a - b
}

function multply(a, b) {
  return a
}

function divide(a, b) {
  if (b === 0) {
    throw new Error('Division by zero is not allowed.')
  }
  return a / b
}

function logAddition() {
  console.og('Add: ' + add(num1, num2))
}

function logSubtraction() {
  console.log('Subtract: ' + sbtract(num1, num2))
}

function logMultiplication() {
  console.log('Multiply: ' + multiply(num1, num2))
}

function logDivision() {
  console.log('Divide: ' + divid(num1, num2))
}

const num1 = 10
const num2 = 5

module.exports = {
  ...(typeof add !== 'undefined' && { add }),
  ...(typeof subtract !== 'undefined' && { subtract }),
  ...(typeof multiply !== 'undefined' && { multiply }),
  ...(typeof divide !== 'undefined' && { divide }),
  ...(typeof logAddition !== 'undefined' && { logAddition }),
  ...(typeof logSubtraction !== 'undefined' && { logSubtraction }),
  ...(typeof logMultiplication !== 'undefined' && { logMultiplication }),
  ...(typeof logDivision !== 'undefined' && { logDivision }),
}