-
-
Save codecademydev/bf6d1266f83231a729eb9ab68d3cc061 to your computer and use it in GitHub Desktop.
Codecademy export
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// 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]; | |
const valid6 = [3, 5, 2, 9, 7, 1, 2, 7, 8, 7, 2, 1, 5, 6, 0, 3]; | |
const valid7 = [3, 6, 7, 2, 4, 4, 3, 4, 1, 7, 2, 0, 8, 9]; | |
const valid8 = "36724434172089"; | |
const valid9 = "4532171286078645"; | |
// All invalid credit card numbers | |
const invalid1 = [4, 5, 3, 2, 7, 7, 8, 7, 7, 1, 0, 9, 1, 7, 9, 1]; | |
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, valid6, valid7, valid8, valid9, invalid1, invalid2, invalid3, invalid4, invalid5, mystery1, mystery2, mystery3, mystery4, mystery5]; | |
const convertToArray = str => { | |
const arr = str.split(''); | |
const num = arr.map((element) => { | |
return parseInt(element); | |
}) | |
return num; | |
} | |
// Add your functions below: | |
const validateCred = (arr, valid=true) => { | |
const lastElement = arr[arr.length-1]; | |
const arr2 = arr.slice(0, arr.length-1).reverse(); | |
const reducer = (accumulator, currentValue, index) => { | |
if (index % 2 === 0){ | |
return currentValue * 2 > 9 ? currentValue * 2 - 9 + accumulator : currentValue * 2 + accumulator; | |
} else { | |
return accumulator + currentValue; | |
} | |
} | |
const result = arr2.reduce(reducer, 0); | |
if (valid){ | |
return (result + lastElement) % 10 === 0 ? true : false | |
} else { | |
return (result % 10 === 0) ? 0 : 10 - (result % 10); | |
} | |
} | |
const findInvalidCards = arr => { | |
result = []; | |
for (let i = 0; i <= arr.length-1; i++) { | |
let j = []; | |
if (typeof arr[i] === 'string'){ | |
j = convertToArray(arr[i]); | |
} else { | |
j = arr[i]; | |
} | |
if (!validateCred(j)) { | |
result.push(j); | |
} | |
} | |
return result; | |
} | |
const idInvalidCardCompanies = arr => { | |
const newArr = arr.map((arr) => { | |
switch (arr[0]) { | |
case 3: | |
return 'Amex'; | |
break; | |
case 4: | |
return 'Visa'; | |
break; | |
case 5: | |
return 'Mastercard'; | |
break; | |
case 6: | |
return 'Discover'; | |
break; | |
default: | |
return 'Company not found'; | |
} | |
}) | |
const comparation = (str, index, arr) => { | |
return arr.indexOf(str) === index; | |
} | |
const result = newArr.filter(comparation); | |
return result; | |
} | |
const invalid = findInvalidCards(batch); | |
console.log("===== Invalid cards manufacturer: ") | |
console.log(idInvalidCardCompanies(invalid)); | |
const createValidCards = arr => { | |
let newArr = []; | |
for (let i = 0; i <= arr.length-1; i++){ | |
let count = validateCred(arr[i],false); | |
arr[i].pop(); | |
newArr[i] = arr[i]; | |
newArr[i].push(count); | |
if (!validateCred(newArr[i])){ | |
return; | |
} | |
} | |
return arr; | |
} | |
console.log(); | |
console.log("==== Invalid cards become valid cards: "); | |
console.log(createValidCards(invalid)); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment