mid exam 02. Easter Gifts

 function solve(input) {
                let gifts = input.shift().split(' ');

                for (let line of input) {
                    if (line === 'No Money') {
                        break;
                    }
                    let tokens = line.split(' ');
                    let command = tokens[0];
                    let gift = tokens[1];

                    if (command === 'OutOfStock') {

                        if (gifts.indexOf(gift) !== -1) {
                            for (let i = 0; i < gifts.length; i++) {
                                if (gifts[i] === gift) {
                                    gifts[i] = 'None';
                                }
                            }

                        }
                    } else if (command === 'Required') {

                        let index = Number(tokens[2]);
                        if (index >= 0 && index < gifts.length) {
                            gifts[index] = gift;
                        }
                    } else if (command === 'JustInCase') {
                        gifts[gifts.length - 1] = gift;
                    }
                }
                gifts = gifts.filter((gift) => {
                    return gift !== 'None';
                });
                console.log(gifts.join(' '));

            }