Rebalance script

rebalance.js

let items = [
    {
        id: 1,
        symbol: 'a',
        cost: 25,
        target: 50,
        value: 500,
    },
    {
        id: 1,
        symbol: 'b',
        cost: 15,
        target: 25,
        value: 200,
    },
    {
        id: 1,
        symbol: 'c',
        cost: 15,
        target: 25,
        value: 200,
    }
];

let cash = {
    value: 300
}

getTotal = () => {
    let total = cash.value;
    items.forEach((item, index) => {
        total = total + item.value;
    });
    return total;
}

balance = () => {
    let newTotal = getTotal();
    items.forEach((item, index) => {
        let amountInCashNeeded = ((newTotal * item.target) / 100) - item.value,
            amountInUnitNeeded = Math.floor(amountInCashNeeded / item.cost);
        console.log(amountInCashNeeded, amountInUnitNeeded);
    });
}

console.log(balance());