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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>First class functions</title>
<script>
var passengers = [ { name: "Jane Doloop", paid: true, ticket: "coach" },
{ name: "Dr. Evel", paid: true, ticket: "firstclass" },
{ name: "Sue Property", paid: false, ticket: "firstclass" },
{ name: "John Funcall", paid: true, ticket: "premium" } ];
function processPassengers(passengers, test) {
for (var i = 0; i < passengers.length; i++) {
if (test(passengers[i])) {
return false;
}
}
return true;
}
function checkNoFlyList(passenger) {
return (passenger.name === "Dr. Evel");
}
function checkNotPaid(passenger) {
return (!passenger.paid);
}
function printPassenger(passenger) {
var message = passenger.name;
if (passenger.paid) {
message = message + " has paid";
} else {
message = message + " has not paid";
}
console.log(message);
return false;
}
//
// plane can only fly if every passenger is on the fly flist
//
var allCanFly = processPassengers(passengers, checkNoFlyList);
if (!allCanFly) {
console.log("The plane can't take off: we have a passenger on the no fly list.");
}
//
// plane can only fly if every passenger has paid
//
var allPaid = processPassengers(passengers, checkNotPaid);
if (!allPaid) {
console.log("The plane can't take off: not everyone has paid.");
}
//
// we don't care about the result here; we're just using
// processPassengers to display the passenger list
//
processPassengers(passengers, printPassenger);
function createDrinkOrder(passenger) {
var orderFunction;
if (passenger.ticket === "firstclass") {
orderFunction = function() {
alert("Would you like a cocktail or wine?");
};
} else if (passenger.ticket === "premium") {
orderFunction = function() {
alert("Would you like wine, cola or water?");
};
} else {
orderFunction = function() {
alert("Your choice is cola or water.");
};
}
return orderFunction;
}
function createDinnerOrder(passenger) {
var orderFunction;
if (passenger.ticket === "firstclass") {
orderFunction = function() {
alert("Would you like chicken or pasta?");
};
} else if (passenger.ticket === "premium") {
orderFunction = function() {
alert("Would you like a snack box or cheese plate?");
};
} else {
orderFunction = function() {
alert("Would you like peanuts or pretzels?");
};
}
return orderFunction;
}
function pickupTrash() {
alert("Can I have your trash, please?");
}
function serveCustomer(passenger) {
var getDrinkOrderFunction = createDrinkOrder(passenger);
var getDinnerOrderFunction = createDinnerOrder(passenger);
getDrinkOrderFunction();
// get dinner order
getDinnerOrderFunction();
getDrinkOrderFunction();
getDrinkOrderFunction();
// show movie
getDrinkOrderFunction();
// pick up trash
pickupTrash();
}
function servePassengers(passengers) {
for (var i = 0; i < passengers.length; i++) {
serveCustomer(passengers[i]);
}
}
servePassengers(passengers);
</script>
</head>
<body>
</body>
</html>