Codecademy export

main.js

// All valid credit card numbers
const valid1 = [4, 5, 3, 9, 6, 7, 7, 9, 0, 8, 0, 1, 6, 8, 0, 8];
const valid2 = [5, 5, 3, 5, 7, 6, 6, 7, 6, 8, 7, 5, 1, 4, 3, 9];
const valid3 = [3, 7, 1, 6, 1, 2, 0, 1, 9, 9, 8, 5, 2, 3, 6];
const valid4 = [6, 0, 1, 1, 1, 4, 4, 3, 4, 0, 6, 8, 2, 9, 0, 5];
const valid5 = [4, 5, 3, 9, 4, 0, 4, 9, 6, 7, 8, 6, 9, 6, 6, 6];

// All invalid credit card numbers
const invalid1 = [4, 5, 3, 2, 7, 7, 8, 7, 7, 1, 0, 9, 1, 7, 9, 5];
const invalid2 = [5, 7, 9, 5, 5, 9, 3, 3, 9, 2, 1, 3, 4, 6, 4, 3];
const invalid3 = [3, 7, 5, 7, 9, 6, 0, 8, 4, 4, 5, 9, 9, 1, 4];
const invalid4 = [6, 0, 1, 1, 1, 2, 7, 9, 6, 1, 7, 7, 7, 9, 3, 5];
const invalid5 = [5, 3, 8, 2, 0, 1, 9, 7, 7, 2, 8, 8, 3, 8, 5, 4];

// Can be either valid or invalid
const mystery1 = [3, 4, 4, 8, 0, 1, 9, 6, 8, 3, 0, 5, 4, 1, 4];
const mystery2 = [5, 4, 6, 6, 1, 0, 0, 8, 6, 1, 6, 2, 0, 2, 3, 9];
const mystery3 = [6, 0, 1, 1, 3, 7, 7, 0, 2, 0, 9, 6, 2, 6, 5, 6, 2, 0, 3];
const mystery4 = [4, 9, 2, 9, 8, 7, 7, 1, 6, 9, 2, 1, 7, 0, 9, 3];
const mystery5 = [4, 9, 1, 3, 5, 4, 0, 4, 6, 3, 0, 7, 2, 5, 2, 3];

// An array of all the arrays above
const batch = [valid1, valid2, valid3, valid4, valid5, invalid1, invalid2, invalid3, invalid4, invalid5, mystery1, mystery2, mystery3, mystery4, mystery5];

// Add your functions below:
const validateCred = arr => {
  // console.log(`Length of array: ${arr.length}`)
  const check_digit = arr[arr.length-1]
  // console.log(`first value ${check_digit}`)
  const temp_arr = []
  for (let i=arr.length-1;i>=0;i--) {
    let curValue = arr[i]
    if (i % 2 === arr.length%2) {
      curValue *= 2
      if (curValue > 9) curValue -= 9
      // console.log(`${i} index: value ${arr[i]} mutate to ${curValue}`)
    }
    temp_arr.push(curValue)
  }
  sumUp = temp_arr.reduce((cur,acc) => cur+acc,0)
  // console.log(sumUp)
  isValid = sumUp%10 == 0
  // console.log(isValid)
  return isValid
}
const validateCred2 = numArr => {
  let total = 0;
  for (let i = numArr.length - 1; i >= 0; i--) {
    // console.log(`${i} index: ${numArr[i]} value`)
    let currValue = numArr[i];
    if ((numArr.length - 1 - i) % 2 === 1) {
      currValue *= 2;
      if (currValue > 9) {
        currValue -= 9;
      }
      console.log(`${i} index: value ${numArr[i]} mutate to ${currValue}`)      
    }
    total += currValue;
  }
  console.log(total)
  return total % 10 === 0;
}
validateCred(valid1)
// validateCred2(valid1)
validateCred(valid2)
// validateCred2(valid2)
validateCred(valid3)
// validateCred2(valid3)
validateCred(valid4)
// validateCred2(valid4)
validateCred(invalid1)
validateCred(invalid2)
validateCred(invalid3)
validateCred(invalid4)
validateCred(invalid5)

const findInvalidCards = nestedArr => {
  invalidArr = nestedArr.filter(x => validateCred(x)=== false)
  // console.log(invalidArr)
  return invalidArr
}
batchInvCards = findInvalidCards(batch)

const idInvalidCardCompanies = nestedArr => {
  companies = {
    3:'Amex (American Express)',
    4:'Visa',
    5:'Mastercard',
    6:'Discover',
  }
  checkInvCards = nestedArr.map(arr => [...new Set(arr.map(firstDigit => Object.keys(companies).includes(firstDigit.toString()) ? companies[firstDigit] : 'Company not found'))])
  console.log(checkInvCards)
  return companies[3]
}
idInvalidCardCompanies(batchInvCards)