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:


// validateCred func
const validateCred = (ccN) =>{
  let len = ccN.length;
  let sum = 0;

  for (let i = ccN.length - 2; i >= 0; i--){
  //^ -2 skips (final) checking number
    let n = ccN[i];
    let ccNumstart = i;

  //makes sure that 2nd-to-last cc num's INDEX value is always even
    if(len % 2 !== 0){
      ccNumstart = i + 1
    }
    
    if(ccNumstart % 2 === 0){
      n *= 2
      if(n > 9){
        n -= 9;
      }
    }
    sum += n;
  }
  
  let checkDigit = ccN[len - 1];
  sum += checkDigit;
  return sum % 10 == 0;
};


// findInvalidCards func

let validArray = [];
let invalidArray = [];

const findInvalidCards = (ccArray) => {

  
  for(let i=0;i < ccArray.length; i++){
    // console.log(i);
    // console.log(ccArray[i]);
    // console.log(validateCred(ccArray[i]));
    if(validateCred(ccArray[i])){
      validArray.push(ccArray[i]);
    } else {
      invalidArray.push(ccArray[i]);
    }
  }
  console.log('Valid CC Nums:')
  console.log(validArray);
  // console.log(invalidArray);
};


// idInvalidCardCompanies() func

const idInvalidCardCompanies = (array) => {
  let companiesInError = {info: 'companies in error',};
  for (ccN of array){
    if(ccN[0] === 3){
      companiesInError.americanExpress = 'in-error'
    } else if(ccN[0] === 4){
        companiesInError.visa = 'in-error'
    } else if(ccN[0] === 5){
        companiesInError.masterCard = 'in-error'
    } else if(ccN[0] === 6){
        companiesInError.discover = 'in-error'
    }
  }
  console.log(companiesInError);
};



// run necessary functions

findInvalidCards(batch);
idInvalidCardCompanies(invalidArray);