Account Balance

function accBalance(input) {
    index = 0;
    let command = input[index];
    index++;
    let totalSum = 0;
    while (command !== "NoMoreMoney") {
        let sum = Number(command);
        if (sum < 0){
            console.log("Invalid operation!");
            break;
        }
        console.log(`Increase: ${sum.toFixed(2)}`);
        command = input[index];
        index++;
        totalSum += sum;
    }
    console.log(`Total: ${totalSum.toFixed(2)}`);
}