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 newArr = [];
  let sum = 0;
  for(let i = array.length - 1; i >= 0; i--){
    if (i % 2 === 0){
      if ((array[i] * 2) > 9){
        newArr.push((array[i] * 2) - 9)
      } 
      else {newArr.push(array[i] * 2)
      }
    } 
    else {newArr.push(array[i])}
  };

  for( let j = 0; j < newArr.length; j ++){
  sum += newArr[j];
  }

  if(sum % 10 === 0){
   return true
  } else {
    return false;
  }
};



let invArr = [];
const findInvalidCard = (array) =>{
  for(let i = 0; i < array.length; i ++)
    if(validateCred(array[i]) === false){
      invArr.push(array[i])
    }
  
return invArr;
};

/* const idInvalidCardCompanies = (array) =>{
  let compArray = [];
  for (let i = 0; i < array.length; i++){
    for (let j = 0; j < array[i].length; j ++)
    if(array[i][1] === 4){
      compArray.push('Visa')
      } else if(array[i][1] === 3){
      compArray.push('Amex')
      } else if(array[i][1] === 5){
      compArray.push('Mastercard')
      } else if(array[i][1] === 6){
      compArray.push('Discover')
  } else (console.log('Company Not Found'))
}
return compArray;
} 

console.log(idInvalidCardCompanies(invArr))

*/