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 validateCred = array => {
  let result = 0;
  for (let i=array.length-1; i>=0; i--){
    let digit = array[i]
    let mod;
    if (array.length % 2 === 1){
      mod = 1;
    } else {
      mod = 0;
    }
    if(i < array.length-1 && i%2=== mod){
      digit *= 2;
      if(digit > 9){
        digit -= 9;
      }
    }
    result = result + digit;
  }
  if (result % 10 === 0){
    return true; // valid
  } else {
    return false; // invalid
  }
};

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

const idInvalidCardCompanies = nestedArray => {
  let result = [];
  for(let i=0; i<nestedArray.length; i++){
    switch(nestedArray[i][0]){
      case 3:
        if (result.includes('Amex')){
          break;
        } else {
          result.push('Amex');
          break;
        }
      case 4:
        if (result.includes('Visa')){
          break;
        } else {
          result.push('Visa');
          break;
        }
      case 5:
        if (result.includes('Mastercard')){
          break;
        } else {
          result.push('Mastercard');
          break;
        }
      case 6:
        if (result.includes('Discover')){
          break;
        } else {
          result.push('Discover');
          break;
        }
      default:
        console.log('Company Not Found');
        break;
    }
  }
  return result;
}