The only reason I didn't include something like that in the post is that I didn't want to overwhelm newbies. I don't agree with your first remark: what do you expect to be returned when you return a value not wrapped in a promise? Not everybody knows their stuff especially junior developers. Never catch a promise that you are un-able to handle. It's better to require the stuff you need by hand. This article, , was originally published at. And before moving past the intro that contains the quiz in question, it's been over a year before I last looked at them, much less read any up-to-date spec.
Long stack traces, unhandled rejection reporting and warnings for many of the mistakes you cover coming in 3. When you chain a promise or promisify a callback instead of using a deferred or the promise constructor both are just as evil here , the wiring is done implicitly and there is a lot less code. Also helped me to re-understand some things : One thing though, Advanced mistake 4, is in my opinion good answer, the Q library however gives a afaik non-a+-standard way of doing that which I like: from: getUserByName 'nolan'. Please provide any additional information below. If you have a suggestion for warnings please open an issue If you want to contribute we'd love docs contributions as you clearly have good technical writing. Reply to this email directly or view it on GitHub. So yes, the example doesn't use all the best practices.
You can see the needed websites to be added to Trusted websites from source of the problem page. In the former, it throws synchronously, which especially in node is almost never what you want. And yet, I had to give a presentation at my last contract with basically the same information in this blog post because half the team was getting it wrong and the other half was tired of cleaning up. It is, but it only works for pairs and then you wind up with the relatively nonsensical 'fst' and 'snd' names. I see just a grey header with a few pieces of text and that's it.
Please could this be fixed. But at this point, I've never used or authored a Promise, ever. I use bluebird for Promises, which is just the most fantastic Promises lib ever conceived, no joke; if you haven't used it try it. The fix could be super simple, I'm just not experienced in this world yet : Thanks for the aurelia webpack support, it is awesome! There's no way that language designers can anticipate every type of convenient syntax, nor would they accept everything that we might want. Looking forward to it getting even better! Also on your timing diagrams it may be worth indicating that methods don't start executing at the exact same time due to the single thread: doSomething.
The problem arises when writing non happy path code, you not only have to think about the promises syntax, but about the abstraction it's creating over callbacks. . Almost all the code I write is asynchronous and it is a pita to always wrestle around different patterns exposed by various libraries, and write bloat for things that are essentially sequential just that they happen to involve a lot of io latency. No manual copy-pasting of polyfills or looking around for the best choice. I suppose a library could provide stricter map and flatMap for people who deeply care about this. I'm not sure I quite understand what you're referring to, but I think you mean the fact that you can chain then calls Promise. It's hard to come up with a short example for this because strange values turning up where they don't belong is a property of large, dynamically typed systems.
Go to on internet explorer 11 I'm using windows 10. I'm sure there are many more. In the latter at least with every promise library and native promise implementation I've seen if the code in '. It would also really help if you were verbose in the naming of your methods as to weather they were async or not. Go to on internet explorer 11 I'm using windows 10. What do you see instead? In fact and I can only speak for myself here, but this is how it played out when I went through it , not having an extensive familiarity with Promises may help for the quiz, because that knowledge isn't crowding your thinking, and all you see is function calls.