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 calculateCard = (arr) => {
    let newArray = [];
    let counter = 1
    for (let i = arr.length - 1; i >= 0; i--) {
        if (counter % 2 === 0) {
            let everySecondNumber = arr[i] * 2
            if (everySecondNumber > 9) {
                everySecondNumber -= 9
                newArray.push(everySecondNumber)
            } else {
                newArray.push(everySecondNumber)
            }
        } else {
            newArray.push(arr[i])
        }
        counter++
    }
    return newArray;
}

const validateCred = (arr) => {
    let numberArray = []
    if (typeof arr !== 'object') {
        arr.toString()
        for (me of arr.toString()) {
            numberArray.push(parseInt(me))
        }

    } else {
        numberArray = arr
    }

    const results = () => calculateCard(numberArray).reduce((first, second) => first + second) % 10 === 0 ? true : false;      //'Valid Card' : 'Invalid Card'
    return results()
}

const findInvalidCards = nestedArray => {
    let invalidCards = []
    for (let i = 0; i < nestedArray.length; i++) {
        if (!validateCred(nestedArray[i])) {
            invalidCards.push(nestedArray[i])
        }
    }
    return invalidCards
}

const idInvalidCardCompanies = arr => {
    let invalidCardsCampanies = []
    for (let i = 0; i < findInvalidCards(arr).length; i++) {

        switch (findInvalidCards(arr)[i][0]) {
            case 3:
                invalidCardsCampanies.push('Amex (American Express)')
                break
            case 4:
                invalidCardsCampanies.push('Visa')
                break
            case 5:
                invalidCardsCampanies.push('Mastercard')
                break

            case 6:
                invalidCardsCampanies.push('Discover')
                break

            default:
                console.log(`Company not found for ${findInvalidCards(arr)[i]}`)
                break


        }
    }
    return invalidCardsCampanies = new Set(invalidCardsCampanies);
}




console.log(idInvalidCardCompanies(batch))
console.log(validateCred('4063113525108939'))
console.log(validateCred(mystery2))
console.log(validateCred(mystery3))


console.log(validateCred(valid1))
console.log(validateCred(valid2))

console.log(validateCred(invalid5))
console.log(validateCred(invalid2))