0. sync_concept_explanation.js

services =  ["帶位", "點餐", "煮菜", "出菜", "結帳"]
staffs = ["老闆"]
clients = ["client1", "client2", "client3"]

function 對每一個client進行處理 (client) {
    function 對client循序給予services處理 (service){
        if(service === "帶位") {
            帶位(staffs[0], client);
        } else if(service === "點餐") {
            點餐(staffs[0], client);
        } else if(service === "煮菜") {
            煮菜(staffs[0], client);
        } else if(service === "出菜") {
            出菜(staffs[0], client);
        } else if(service === "結帳") {
            結帳(staffs[0], client);
        }
    }(service of services)
} (client of clients)

console.log("所有客人的餐點服務全部完成")