JavaScript is also a functional programming language. What you have here is a «higher order function», a function which takes a function as a parameter. Higher order functions are synchronous (but see note below). Sources: Functional Programming Higher order functions in JavaScript map() is a typical example of a higher order function. It takes a … Read more
Twitter has Web Intent events for loaded, rendered, resize, tweet, follow, retweet, like, and click. twttr.events.bind( ‘tweet’, function (event) { // Do something there } ); The behavior was changed in the fall of 2015 due to the unreliableness of callbacks happening after an event is complete. They will now be triggered when a user … Read more
done is a method called internally by the strategy implementation. Then it navigates you, as you can see, to one of the success / error / fail methods (again, by the implementation. there are more options). Each of these options may calls to the next, where in your snippet code is the following: function(req, res) … Read more
For functions returning void, use doAnswer() doAnswer(…).when(mockedObject).handle(any(Callback[].class)); And an Answer that performs the interception must go in as the parameter to doAnswer, e.g. as an anonymous class: new Answer() { public Object answer(InvocationOnMock invocation) { Object[] args = invocation.getArguments(); Mock mock = invocation.getMock(); return null; }} In this case args will be the array Callback[]!
Please, first read the docs to understand what i say. The answer: To scrape additional fields which are on other pages, in a parse method extract URL of the page with additional info, create and return from that parse method a Request object with that URL and pass already extracted data via its meta parameter. … Read more
Any defined function can be passed by simply using its name, without adding the () on the end that you would use to invoke it: def my_callback_func(event): # do stuff o = Observable() o.subscribe(my_callback_func) Other example usages: class CallbackHandler(object): @staticmethod def static_handler(event): # do stuff def instance_handler(self, event): # do stuff o = Observable() # … Read more
Check the introduction in this: http://jibbering.com/faq/faq_notes/closures.html. It can help you understand better how closures relate to functions. Here is a set of closure examples: http://www.javascriptkit.com/javatutors/closures2.shtml Basically, the callback is like a function pointer. The bit that makes it a closure, is when that function accesses anything on the context where it lives, like variables outside … Read more
One really important distinction to keep in mind, which is related to Milan Novota’s answer, is that callbacks on an ActiveRecord have the ability to cancel the action being called and all subsequent callbacks, where as observers do not. class Model < ActiveRecord::Base before_update :disallow_bob def disallow_bob return false if model.name == “bob” end end … Read more
I’m not entirely sure what you’re trying to do there – your callback is a block… is that intentional? I would expect your method to look something like this: – (void)signInAccountWithUserName:(NSString *)userName password:(NSString *)password; If the intention of your callback is to execute some additional code (specified when you call the method) on completion, then … Read more
The callback is a pointer to a C function, and in Swift you can pass only a global function or a closure (which does not capture any state), but not an instance method. So this does work: CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), nil, { (_, observer, name, _, _) in print(“received notification: \(name)”) }, “myMessage”, nil, .DeliverImmediately) But since … Read more