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 sum=0;
  array.reverse();
  for(let i=0;i<array.length;i++){
    if(i%2===0){
      sum+=array[i];
    }else{
      let result=array[i]*2
       if(result>9){
        sum+=(result-9)
      }
      else{
        sum+=result;
      }
    }
  }
  array.reverse();
  if(sum%10===0){
    return true;
  }
  return false;
}

const findInvalidCards=array =>{
  let newArray=[];
  for(let i=0;i<array.length;i++){
    if(!validateCred(array[i])){
      newArray.push(array[i]);
    }
  }
  
  return newArray;
}

const idInvalidCardCompanies=array=>{
  let companiesArray=[];
  for(let i=0;i<array.length;i++){
    switch (array[i][0]){
      case 3:
      if(!companiesArray.includes("Amex")){
        companiesArray.push("Amex")
      }
      break;
      case 4:
      if(!companiesArray.includes("Visa")){
        companiesArray.push("Visa")
      }
      break;
      case 5:
      if(!companiesArray.includes("Mastercard")){
        companiesArray.push("Mastercard")
      }
      break;
      case 6:
      if(!companiesArray.includes("Discover")){
        companiesArray.push("Discover")
      }
      break;
       default:
      console.log("Company not found");
    }

  }
  return companiesArray;
}

console.log(findInvalidCards(batch));