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Created June 17, 2021 20:51
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Codecademy export
// 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 = (array) => {
let modded = array.map(x => x); // to avoid moddifing array
for(let i = modded.length -2; i >= 0; i-= 2)
{
modded[i] = modded[i] * 2;
if(modded[i] > 9)
{
modded[i] = modded[i] -9;
}
}
// sum all numbers in the array
modded = modded.reduce(function(a, b){ return a + b; });
if(modded % 10 === 0)
{
return true;
} else
{
return false;
}
};
const findInvalidCards = (array) => {
let invalidCards = [];
for(let i = 0; i <= array.length -1; i++)
{
if(!validateCred(array[i])){
invalidCards.push(array[i]);
}
}
return invalidCards;
};
const idInvalidCardCompanies = (array) => {
let companies = [];
for(let i = 0; i <= array.length -1; i++){
switch(array[i][0]){
case 3 :
while(!companies.includes('Amex'))
{
companies.push('Amex');
}
break;
case 4:
while(!companies.includes('Visa'))
{
companies.push('Visa');
}
break;
case 5:
while(!companies.includes('Mastercard'))
{
companies.push('Mastercard');
}
break;
case 6:
while(!companies.includes('Discover'))
{
companies.push('Discover');
}
break;
default:
console.log(' company not found');
}
}
return companies;
};
console.log(idInvalidCardCompanies(findInvalidCards(batch)));
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