JS file doesn't work

Question

Here's the code in my JS file:

function arrayContains(array, value){
    return array.indexOf(value) > -1;
}
var possibleOptions = ["male", "female", "m", "f"];
var gender = prompt("What's your gender?","");
while(!arrayContains(possibleOptions, gender))
    gender = prompt("Invalid input. What's your gender?");
var name = prompt("What's your name?","");
var greeting = (gender == "male" || gender == "m") ? "Sup dude." : "Sup girl.";
alert("Hello, " + name + "! " + greeting);

The error I get:

Line: 5
char: 1
Object expected.

I can't figure it out.

Answer 1

Two problems:

1. As mentioned in comments, the w/cscript.exe script host does not support neither prompt() nor alert()
2. JScript arrays have no .IndexOf() method

You have to roll your own:

function arrayContains(array, value){
    for (var i = 0, e = array.length; i < e; ++i) {
        if (array[i] === value) {
            return true;
        }
    }
    return false;
}

function prompt(p) {
    WScript.Stdout.Write(p + " > ");
    return WScript.StdIn.ReadLine();
}

function alert(s) {
    WScript.Echo(s);
}

var possibleOptions = ["male", "female", "m", "f"];
var gender = prompt("What's your gender?","");
while(!arrayContains(possibleOptions, gender))
    gender = prompt("Invalid input. What's your gender?");
var name = prompt("What's your name?","");
var greeting = (gender == "male" || gender == "m") ? "Sup dude." : "Sup girl.";
alert("Hello, " + name + "! " + greeting);

output (console):

cscript 26073853.js
What's your gender? > neuter
Invalid input. What's your gender? > male
What's your name? > tarzan
Hello, tarzan! Sup dude.

cscript 26073853.js
What's your gender? > female
What's your name? > jane
Hello, jane! Sup girl.