91 lines
2.2 KiB
JavaScript
91 lines
2.2 KiB
JavaScript
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// All valid credit card numbers
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const valid1 = [4, 5, 3, 9, 6, 7, 7, 9, 0, 8, 0, 1, 6, 8, 0, 8]
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const valid2 = [5, 5, 3, 5, 7, 6, 6, 7, 6, 8, 7, 5, 1, 4, 3, 9]
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const valid3 = [3, 7, 1, 6, 1, 2, 0, 1, 9, 9, 8, 5, 2, 3, 6]
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const valid4 = [6, 0, 1, 1, 1, 4, 4, 3, 4, 0, 6, 8, 2, 9, 0, 5]
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const valid5 = [4, 5, 3, 9, 4, 0, 4, 9, 6, 7, 8, 6, 9, 6, 6, 6]
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// All invalid credit card numbers
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const invalid1 = [4, 5, 3, 2, 7, 7, 8, 7, 7, 1, 0, 9, 1, 7, 9, 5]
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const invalid2 = [5, 7, 9, 5, 5, 9, 3, 3, 9, 2, 1, 3, 4, 6, 4, 3]
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const invalid3 = [3, 7, 5, 7, 9, 6, 0, 8, 4, 4, 5, 9, 9, 1, 4]
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const invalid4 = [6, 0, 1, 1, 1, 2, 7, 9, 6, 1, 7, 7, 7, 9, 3, 5]
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const invalid5 = [5, 3, 8, 2, 0, 1, 9, 7, 7, 2, 8, 8, 3, 8, 5, 4]
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// Can be either valid or invalid
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const mystery1 = [3, 4, 4, 8, 0, 1, 9, 6, 8, 3, 0, 5, 4, 1, 4]
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const mystery2 = [5, 4, 6, 6, 1, 0, 0, 8, 6, 1, 6, 2, 0, 2, 3, 9]
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const mystery3 = [6, 0, 1, 1, 3, 7, 7, 0, 2, 0, 9, 6, 2, 6, 5, 6, 2, 0, 3]
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const mystery4 = [4, 9, 2, 9, 8, 7, 7, 1, 6, 9, 2, 1, 7, 0, 9, 3]
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const mystery5 = [4, 9, 1, 3, 5, 4, 0, 4, 6, 3, 0, 7, 2, 5, 2, 3]
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// An array of all the arrays above
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const batch = [
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valid1,
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valid2,
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valid3,
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valid4,
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valid5,
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invalid1,
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invalid2,
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invalid3,
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invalid4,
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invalid5,
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mystery1,
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mystery2,
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mystery3,
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mystery4,
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mystery5,
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]
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// Add your functions below:
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const validateCred = function (card) {
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let luhn = 0
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let double = false
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for (let i = card.length - 1; i >= 0; i--) {
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let cur = card[i]
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if (double) {
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cur *= 2
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}
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double = !double
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if (cur > 9) {
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cur -= 9
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}
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luhn += cur
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}
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return luhn % 10 === 0
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}
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const findInvalidCards = function (cards) {
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return cards.filter(card => !validateCred(card))
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}
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const idInvalidCardCompanies = function (invalid) {
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let issuingCompanies = []
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const companies = {
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3: 'Amex (American Express)',
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4: 'Visa',
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5: 'Mastercard',
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6: 'Discover',
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}
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invalid.forEach((card) => {
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let c = companies[card[0]]
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issuingCompanies.push(c || 'Company not found')
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})
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return [...new Set(issuingCompanies)]
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}
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const invalid = findInvalidCards(batch)
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console.log(invalid.length)
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console.log(idInvalidCardCompanies(invalid))
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