Hi,
looking to aid my understanding. The code below works but my understanding of what is happening in the while loop is trailing. I understand that i’ve set curr to equal elem[0] which would mean it takes the value of “penny” for example. but when i am deducting the amount taking from the drawer to give back in change, and adding to variable amount. why does it accept adding with curr( which would be a string) as opposed to the currSum which would be an integer?
**Your code so far**
const currencyUnit = {
"PENNY": 1,
"NICKEL": 5,
"DIME": 10,
"QUARTER": 25,
"ONE": 100,
"FIVE": 500,
"TEN": 1000,
"TWENTY": 2000,
"ONE HUNDRED": 10000
}
function checkCashRegister(price, cash, cid) {
let changeSum = cash * 100 - price * 100;
let changeSumCheck = changeSum;
let change = [];
let status = '';
let cidSum = 0;
let filteredCid = cid.filter(elem => elem[1] !== 0).reverse();
filteredCid.forEach(elem => {
let curr = elem[0];
let currSum = elem[1] * 100;
cidSum += currSum;
let amount = 0;
while (changeSum >= currencyUnit[curr] && currSum > 0) {
amount += currencyUnit[curr];
changeSum -= currencyUnit[curr];
currSum -= currencyUnit[curr];
}
if (amount !== 0) {
change.push([curr, amount / 100]);
}
});
if (changeSum > 0) {
status = 'INSUFFICIENT_FUNDS';
change = [];
} else if (changeSum == 0 && changeSumCheck == cidSum) {
status = 'CLOSED';
change = cid;
} else {
status = 'OPEN';
}
return { 'status': status, 'change': change };
}
checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]]);
Challenge: JavaScript Algorithms and Data Structures Projects - Cash Register
Link to the challenge:
