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// 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]; | |
const validateCred = arr => { | |
let checkSum = 0; | |
let doubling = true; | |
//Iterate through array, double what is needed | |
for(let i = arr.length - 2; i >= 0; i--){ | |
if(doubling){ | |
let doubled = arr[i] * 2; | |
if(doubled > 9){ | |
doubled -= 9; | |
} | |
checkSum += doubled; | |
} else { | |
checkSum += arr[i]; | |
} | |
doubling = !doubling; | |
}//End for loop | |
const totalSum = checkSum + arr[arr.length - 1]; | |
if(totalSum % 10 === 0){ | |
return true; | |
} else { | |
return false; | |
} | |
}; | |
const findInvalidCards = arr => { | |
const invCrds = batch.filter(arr => validateCred(arr)); | |
return invCrds; | |
}; | |
const idInvalidCardCompanies = arr => { | |
const invCompanies = []; | |
arr.forEach(array => { | |
switch(array[0]) { | |
case 3: | |
if(!invCompanies.includes('Amex (American Express)')){ | |
invCompanies.push('Amex (American Express)'); | |
}; | |
break; | |
case 4: | |
if(!invCompanies.includes('Visa')){ | |
invCompanies.push('Visa'); | |
}; | |
break; | |
case 5: | |
if(!invCompanies.includes('Mastercard')){ | |
invCompanies.push('Mastercard'); | |
}; | |
break; | |
case 6: | |
if(!invCompanies.includes('Discover')){ | |
invCompanies.push('Discover'); | |
}; | |
break; | |
default: | |
console.log('Company not found'); | |
break; | |
} | |
}); | |
return invCompanies; | |
}; | |
//console.log(validateCred(valid2)); | |
//batch.forEach(validateCred); | |
//console.log(findInvalidCards(batch)); | |
console.log(idInvalidCardCompanies(findInvalidCards(batch))); | |
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