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main.js
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main.js
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const digitSpace = {};
function init(){
const numberOfDigits = 16;
const numberSpacing = 4;
initItems(numberOfDigits, numberSpacing, numberOfDigits);
document.getElementById("submit").addEventListener("click", ()=>{logValidCreditCardNumbers(numberOfDigits)});
}
function logValidCreditCardNumbers(maxDigits){
clearDisplay();
const startArray = findNumbers(maxDigits);
console.log(startArray);
bruteCracker(startArray);
}
function findNumbers(maxDigits){
const biggestIndex = maxDigits - 1;
const indexes = arrOf0To(biggestIndex);
const inputValues = [];
console.log(digitSpace);
indexes.forEach(index=>{inputValues.push(digitSpace[index] === undefined ? NaN : digitSpace[index])})
return inputValues.reverse();
}
function arrOf0To(num, currentIteration = 0, currentArray = []){
return currentIteration == num + 1 ? currentArray : arrOf0To(num, currentIteration+1 ,[...currentArray,currentIteration])
}
function addToDisplay(toDisplay){
const outputs = document.getElementById("outputs");
const newDiv = document.createElement("div");
newDiv.innerText = toDisplay;
outputs.appendChild(newDiv);
}
function clearDisplay(){
const outputs = document.getElementById("outputs");
outputs.innerHTML = '';
}
//numArray has length numberOfDigits
function bruteCracker(numArray){
if(isFullyPopulated(numArray)){
console.log(numArray);
if(isLuhnValid(numArray)){
const validNumber = numArray.join('');
addToDisplay(validNumber);
}
return;
}
const indexToIterateOn = getFirstInvalidNumbersIndex(numArray);
const numberRange = arrOf0To(9);
const numArrayClone = [...numArray];
numberRange.forEach((num)=>{
numArrayClone[indexToIterateOn] = num;
bruteCracker(numArrayClone);
})
}
function getFirstInvalidNumbersIndex(numArray, index=0){
//No invalid values
if(index > numArray.length -1){
return null;
}
//we've found an invalid value
if(isNaN(numArray[index])){
return index;
}
return getFirstInvalidNumbersIndex(numArray, index + 1);
}
function isFullyPopulated(numArray){
return !getFirstInvalidNumbersIndex(numArray);
}
function isLuhnValid(numArray){
const doublingParity = isEven(numArray.length);
const luhnDoublingNumbers = numArray.map((num, index)=>{
if(index == numArray.length -1){
return num;
}
const phase2Value = isEven(index) === doublingParity ? doubleAndMerge(num) : num;
return phase2Value;
})
return sumNums(luhnDoublingNumbers) % 10 === 0;
}
function sumNums(numArray){
return numArray.reduce((acc, num)=>{
return num + acc;
})
}
function isEven(num){
return num % 2 === 0
}
function doubleAndMerge(num){
const double = num * 2;
return double > 9 ? double - 9 : double;
}
function initItems(itemsLeft, numberSpacing, originalNumber){
const inputBar = document.getElementById("inputs");
if(itemsLeft == 0){
return;
}
const newInput = makeSingleBox(itemsLeft-1);
inputBar.appendChild(newInput);
if(itemsLeft !== originalNumber-1 && itemsLeft !== 1 && itemsLeft % numberSpacing === 1 ){
const newHyphen= makeHyphen();
inputBar.appendChild(newHyphen);
}
initItems(itemsLeft-1,numberSpacing, originalNumber);
}
function makeSingleBox(id){
const newInput = document.createElement("INPUT");
newInput.setAttribute("type","text");
newInput.id = id;
newInput.pattern= "[0-9]*";
newInput.maxLength= "1";
newInput.style.width = "1rem"
newInput.addEventListener("change",(e)=>{
digitSpace[id] = parseInt(e.currentTarget.value,10);
});
return newInput;
}
function makeHyphen(){
const newHyphen = document.createElement("div");
newHyphen.innerText = "-";
return newHyphen;
}
init();
const testArray = [1,NaN,2,NaN,NaN];