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February 2, 2024 19:02
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// 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 = [4, 5, 3, 9, 6, 8, 9, 8, 8, 7, 7, 0, 5, 7, 9, 8] | |
// 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,valid6, invalid1, invalid2, invalid3, invalid4, invalid5, mystery1, mystery2, mystery3, mystery4, mystery5] | |
// Identify the credit card companies | |
const creditCompanies = { | |
3:'Amex (American Express)', | |
4: 'Visa', | |
5: 'Mastercard', | |
6: 'Discover' | |
} | |
// Add your functions below: | |
const sumAll = arrOfNums => { | |
return arrOfNums.reduce((acc,newNum)=>acc + newNum) | |
} | |
const multyplayArrByTwo = arr => arr.map(num=> num * 2) | |
const decrementItFrom9 = arr => arr.map(num => { | |
if (num > 9){ | |
return num - 9 | |
}else{ | |
return num | |
} | |
}) | |
const reverseAnArray = arr => arr.reverse() | |
const evenArrIndex = arr =>{ | |
let evenIndexNum = []; | |
for (let i = 0; i < arr.length; i++){ | |
if (i % 2 === 0){ | |
evenIndexNum.push(arr[i]) | |
} | |
} | |
return evenIndexNum | |
} | |
const oddArrIndex = arr => { | |
let oddIndexNum = []; | |
for (let i = 0; i < arr.length; i++){ | |
if (i % 2 !== 0){ | |
oddIndexNum.push(arr[i]) | |
} | |
} | |
return oddIndexNum | |
} | |
// Step one reverse an array | |
// const arrayReversed = reverseAnArray(test) | |
// console.log(arrayReversed, 'passed') | |
// Step two select even index from an reversed array. | |
// const evenIndexSelected = evenArrIndex(arrayReversed) | |
// console.log(evenIndexSelected, evenIndexSelected.length, 'passed') | |
// Step three Select odd index from an reversed array | |
// const oddIndexSelected = oddArrIndex(arrayReversed) | |
// console.log(oddIndexSelected, oddIndexSelected.length, 'passed') | |
// Step four multiplay each number withen evenIndexSelected by 2 | |
// const multyByTwo = multyplayArrByTwo(oddIndexSelected) | |
// console.log(multyByTwo, 'passed') | |
// Step five check if any number withen multyByTwo is greater than 9 | |
// If so decrement it from 9 | |
// const decrementItList = decrementItFrom9(multyByTwo) | |
// console.log(decrementItList, 'passed') | |
// Step six sum array one and two and then modulo 10 if the result is zero that mean the cridet is valid otherwise is not valid | |
// console.log((sumAll(decrementItList) + sumAll(evenIndexSelected)) % 10 ) | |
const validateCred = arr => { | |
let arrayReversed = reverseAnArray(arr) | |
const evenIndexSelected = evenArrIndex(arrayReversed) | |
const oddIndexSelected = oddArrIndex(arrayReversed) | |
const multyByTwo = multyplayArrByTwo(oddIndexSelected) | |
const decrementItList = decrementItFrom9(multyByTwo) | |
const sumTwoList = sumAll(decrementItList) + sumAll(evenIndexSelected) | |
arrayReversed = reverseAnArray(arr) | |
if (sumTwoList % 10 === 0){ | |
return true | |
} | |
return false | |
} | |
const idInvalidCardCompanies = (arr)=> { | |
if(creditCompanies[arr[0]]) { | |
return creditCompanies[arr[0]] | |
}else{ | |
return 'Company not found' | |
} | |
} | |
console.log('\nInvalids credit card \n') | |
for (numsArr of batch){ | |
if (!validateCred(numsArr)){ | |
let creditNum = numsArr.join('') | |
console.log(`${idInvalidCardCompanies(numsArr)} with number |${creditNum}| is not valid!`) | |
} | |
} | |
console.log('\nValids credit card \n') | |
for (numsArr of batch){ | |
// console.log(numsArr) | |
if (validateCred(numsArr)){ | |
let creditNum = numsArr.join('') | |
console.log(`${idInvalidCardCompanies(numsArr)} with number |${creditNum}| is valid!`) | |
} | |
} |
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