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:
// Luhn algorithm
let validateCard = (array) => {
  let newArray=[];
  let subArray=[];
  let sum;
  if (array.length === 16) {
      for (let i=array.length-1; i >= 0; i--) {
      if (i % 2 === 0) {
      if (array[i]*2>9) {
        subArray.push(array[i]*2-9);
        } else {
          subArray.push(array[i]*2);
        }
      } else {
      subArray.push(array[i]);
    } 
      }
    sum=subArray.reduce((accumulator,currentValue) => {
    return accumulator + currentValue;
  },0);
  if (sum%5 ===0) {
  return true;  
  }  else {
  return false;  
    }
  }   else if (array.length === 15) {
          for (let i=array.length-1; i >= 0; i--) {
      if (i % 2 !== 0) {
      if (array[i]*2>9) {
        subArray.push(array[i]*2-9);
        } else {
          subArray.push(array[i]*2);
        }
      } else {
      subArray.push(array[i]);
    } 
      }
  sum=subArray.reduce((accumulator,currentValue) => {
    return accumulator + currentValue;
  },0);
  if (sum%5 ===0) {
  return true;
    }  else {
    return false;
        }     
       } else {
         return false;
                 }
}
// task 4 - searching through invalid cards list
let newInvalidCards = [];
let newValidCards = [];
let findInvalidCards = (array) => {
  for (let j=0; j<array.length; j++) {
    if (validateCard(array[j]) === false) {
        newInvalidCards.push(array[j]);
        } else {
          newValidCards.push(array[j]);
        }
  }
  }

// commands are below
findInvalidCards(batch);
console.log('Invalid cards are;' + newInvalidCards);
  console.log('Valid cards are;' + newValidCards);