my problem 2 - mid exam

function problem2(array) {
    let biscuits = array.shift().split(', ');
    let command = array.shift();

    while (command != 'No More Money') {
        let tokens = command.split(' ');
        let action = tokens[0];

        switch (action) {
            case 'OutOfStock':
                let outOfStockBiscuit = tokens[1];
                for (let i = 0; i < biscuits.length; i++) {
                    let biscuit = biscuits[i];
                    if (biscuit == outOfStockBiscuit) {
                        biscuits.splice(i, 1, 'None')
                    }
                }
                break;
            case 'Required':
                let requiredBiscuit = tokens[1];
                let index = Number(tokens[2]);
                if (index >= 0 && index < biscuits.length) {
                    if (biscuits[index] != 'None') {
                        biscuits.splice(index, 1, requiredBiscuit);
                    }
                }
                break;
            case 'Last':
                let pushBiscuit = tokens[1];
                biscuits.push(pushBiscuit);
                break;
        }

        command = array.shift();
    }

    let biscuitsForPrint = biscuits.filter(x => x != 'None');
    console.log(biscuitsForPrint.join(' '));
}