Can someone please help me with the code snippet provided below? This code is sourced from: http://www.html5rocks.com/en/tutorials/frameworks/angular-websockets
app.factory('socket', function ($rootScope) {
var socket = io.connect();
return {
on: function (eventName, callback) {
socket.on(eventName, function () {
var args = arguments;
$rootScope.$apply(function () {
callback.apply(socket, args);
});
});
},
emit: function (eventName, data, callback) {
socket.emit(eventName, data, function () {
var args = arguments;
$rootScope.$apply(function () {
if (callback) {
callback.apply(socket, args);
}
});
})
}
};
I am struggling to comprehend:
- What is the origin of the variable
arguments? - Could someone explain what
callback.applyrepresents and its purpose?