使用.shift（）更新数组的元素

Question

我正在为一个非常简单的问题而苦苦挣扎，但是我一直在研究它，似乎无法弄清楚该怎么做。

http://jsbin.com/harokap/edit?js，输出

var parkRides = [["Bumbling Boats", 20], ["Scary Cyclone", 45], 
["Cloudy Crevase", 10], ["Crazy Crapshoot", 5]];

var fastPassQueue = ["Crazy Crapshoot", "Cloudy Crevase", "Bumbling Boats",
    "Crazy Crapshoot"];

function writeTicket(allRides,passRides,pick){
    if(pick == passRides[0]){
        passRides.shift();
        return function(){
            alert("Lucky you! You got a Fast Pass to " + pick + "!");
        };
    }else{
        for(var i = 0; i < allRides.length; i++){
            if(pick == allRides[i][0]){
                return function(){
                    alert("Now printing ticket for " + pick + ". Your wait time is about " + allRides[i][1] + " minutes.");
                };
            }
        }
    }
}

var rideChoice = "Crazy Crapshoot";

var ticket = writeTicket(parkRides,fastPassQueue,rideChoice);

ticket();

在该代码中，我有一个名为“ fastPassQueue”的数组，我想在“ writeTicket”函数内使用passRides.shift（）更新该数组。

我希望writeTicket能够识别每次我运行该函数时都已从fastPassQueue中删除第一个元素（并在第一次调用该函数后运行else条件），但是我不知道该怎么做。 我尝试将fastPassQueue添加到该函数的开头，如果我先以原始方式运行该函数，然后将其添加到该函数中，则可以正常工作，但是我不知道如何从一开始就使它起作用。

预先感谢您的任何反馈。

Answer 1

就像不在for循环中返回函数，而是创建字符串，然后始终返回函数一样简单

var parkRides = [
    ["Bumbling Boats", 20],
    ["Scary Cyclone", 45],
    ["Cloudy Crevase", 10],
    ["Crazy Crapshoot", 5]
];

var fastPassQueue = ["Crazy Crapshoot", "Cloudy Crevase", "Bumbling Boats", "Crazy Crapshoot"];

function writeTicket(allRides, passRides, pick) {
    if (pick == passRides[0]) {
        passRides.shift();
        return function () {
            alert("Lucky you! You got a Fast Pass to " + pick + "!");
        };
    } else {
        var match = "";

        for (var i = 0; i < allRides.length; i++) {
            if (pick == allRides[i][0]) {
                match = "Now printing ticket for " + pick + ". Your wait time is about " + allRides[i][1] + " minutes.";
            }
        }

        return function () {
            alert(match);
        };
    }
}

var rideChoice = "Bumbling Boats";

var ticket = writeTicket(parkRides, fastPassQueue, rideChoice);

ticket();

小提琴