What kind of JavaScript is this Page.getProximityListCallback = function(obj) {; is this a function?
Surely it is but what is it with this syntax? Can someone explain?
Update:
Thank you for your answers. Here is a follow up: Why then use function Page() {}? What is its purpose? Why not just call getProximityListCallback()?
It's an anonymous function which is then assigned to a variable.
http://helephant.com/2008/08/javascript-anonymous-functions/
This is something you can think of like adding a method to the Page class. In run-time.
Method then will be accessible via the Page.getProximityListCallback() call.
Check here (JavaScript tab) - http://jsbin.com/arocu/edit.
BTW: it's a nice service to have fun with JavaScript.
Functions are "first class" values in JavaScript, that is, you can have a constant of type "function" and assign it to a variable or object member, just like you do with numbers or strings. Compare
var foo = "cow";
and
var bar = function() { }
Conceptually there is no difference between these two lines.
You can have namespaces in your JavaScript code using objects like this:
var Page = {};
Page.getProximityListCallback = function (obj) {
// ...
};
And remember that
function func(obj) {
// ...
}
is the same thing as
var func = function (obj) {
// ...
};
So in your example you are assigning an anonymous function to the Page object's getProximityListCallback member.
