Is anyone else completely lost when it comes to closures?

I have the same problem and I will probably quit my Treehouse subscription because of that. I watched Closures a few times and not a single piece of code made any sense to me. Now, everything is so hard and I don't understand anything. I am very disappointed.

I think this is a decent website to get some straightforward information : http://fuckingswiftblocksyntax.com/

Not an all encompassing website though and with most things in coding it's just practice....

I'm lost too, I feel just like I'm copying code but not learning..... And I saw the clousures course 2 times....

I think it is always good to have a look around and see what other sites have done. I thought this was a really good video https://www.youtube.com/watch?v=__1B5m-gE9A . I know its basic but it is a starting point and doesn't too much code speak. The problems I find with sites like Treehouse, which I say do a good job, is that they become too technical and one can get lost with the language. This video explains it in very layman terms. Unfortunately the link does not work.

I'm just learning it over and over again, doing the videos several times and using other resources (YouTube!) that explain it slightly differently, or refer to Apple's documentation to help with the syntax. Every day a chunk goes >clunk< in my head and I think eventually it'll all fit :) Hang in there everybody! Don't let go now, the more consistently you work on this the easier it gets!

i was too, but doing some digging i find out that the completion it's just the return type of a closure (callback) , so the best way of think about the "completion handler" is thinking about it like if it were the return type of any function.

so, in the networkOperation class we wanted to download the JSON from the URL, that why the completion is of type [String:AnyObject] because our JSON is on that format. and we wanted back on the completion. the same way on the forecastService struct we wanted a instance of CurrentWeather with the values of the json on it (this is called: parsing the JSON) take parsing the JSON like reading the JSON.

I feel the same. I would love it if Pasan could slow down the pace a little bit.

I've spent like 2 days just watching 3 classes and digging through a lot of online examples and documentation. The order of this classes are wrong. You can't understand these classes if you don't watch the Closures section, but also, you can't understand the Closures section if you don't know how the network operation works, but network operation are on the Build a Weather App section. Kept bouncing back and forth. That's way too confusing. Another thing, like in this video, he called the "downloadJSONFromURL" method, and started getting rid of those parenthesis like a ninja, just like all of us are already masters in trailing closures. This is just WAY TOO FAST!

Did you do the course? If you haven't, it might help.

I am completely lost as well. Very disappointed as I am not getting any of this.

Yes, it is very complex to understand. New version of Xcode and Swift showing some errors too.