Cash Register Project - LukasKnd

JavaScript
1

Tell us what’s happening:

Basically this is my my cash register project which works and passes all the tests. I am interested to know if my approach of using

Math.round(change * 100) / 100;

after every math operation is correct solution because if i were not to use it the results would give back strange numbers like : 74.99999995 etc…

Also are there any solutions on how i could tidy up the code to make it more readable or more efficient

Your code so far




function checkCashRegister(price, cash, cid) {
    const clone = JSON.parse(JSON.stringify(cid));

    let change = cash - price;
    change = Math.round(change * 100) / 100;

    const database = {
        "ONE HUNDRED": 100,
        "TWENTY": 20,
        "TEN": 10,
        "FIVE": 5,
        "ONE": 1,
        "QUARTER": 0.25,
        "DIME": 0.1,
        "NICKEL": 0.05,
        "PENNY": 0.01
    };

    let changeArr = [];

    for(let i = clone.length - 1; i >=0; i--) {

        let changeCur = 0;

        while(change >= database[clone[i][0]] && clone[i][1] > 0) {

            change -= database[clone[i][0]];
            change = Math.round(change * 100) / 100;

            clone[i][1] -= database[clone[i][0]];  
            clone[i][1] = Math.round(clone[i][1] * 100) / 100;

            changeCur += database[clone[i][0]];  
            changeCur = Math.round(changeCur * 100) / 100;
            
        }

        if(changeCur !== 0) changeArr.push([clone[i][0], changeCur])

    }


    if(change > 0) {
        return {
            'status': 'INSUFFICIENT_FUNDS',
            'change': []
        }
    } else if(clone.every(el => el[1] === 0)) {
        return {
            'status': 'CLOSED',
            'change': cid
        }
    } else {
        return {
            'status': 'OPEN',
            'change': changeArr
        }
    }

}

console.log(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]]));

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register