gistfile1.txt

/**
 * @param {number[]} bills
 * @return {boolean}
 */
var lemonadeChange = function (bills) {
    let tens = 0;
    let fiths = 0;

    while (bills.length) {
        const client = bills.shift();

        if (client === 5) {
            fiths += 5;
        }

        if (client === 10) {
            if (fiths > 0) {
                fiths -= 5;
                tens += 10;
            } else {
                return false;
            }
        }

        if (client === 20) {
            if (tens > 0 && fiths > 0) {
                tens -= 10;
                fiths -= 5;
            } else if (tens === 0 && fiths > 10) {
                fiths -= 15;
            } else {
                return false;
            }
        }


    }

    return true;
};