Is using componentDidMount() as an async function good practice in React Native or should I avoid it? I need to get some info from AsyncStorage when the component mounts, but the only way I know to make that possible is to make the componentDidMount() function async. async componentDidMount() { let auth = await this.getAuth(); if … Read more
I’ve been messing around with the fetch() api recently, and noticed something which was a bit quirky. let url = “http://jsonplaceholder.typicode.com/posts/6”; let iterator = fetch(url); iterator .then(response => { return { data: response.json(), status: response.status } }) .then(post => document.write(post.data)); ; post.data returns a Promise object. http://jsbin.com/wofulo/2/edit?js,output However if it is written as: let url … Read more
I would like a for in loop to send off a bunch of network requests to firebase, then pass the data to a new view controller once the the method finishes executing. Here is my code: var datesArray = [String: AnyObject]() for key in locationsArray { let ref = Firebase(url: “http://myfirebase.com/” + “\(key.0)”) ref.observeSingleEventOfType(.Value, withBlock: … Read more
I tried the sample provided within the documentation of the requests library for python. With async.map(rs), I get the response codes, but I want to get the content of each page requested. This, for example, does not work: out = async.map(rs) print out[0].content 14 Answers 14
Yesterday I was giving a talk about the new C# “async” feature, in particular delving into what the generated code looked like, and the GetAwaiter() / BeginAwait() / EndAwait() calls. We looked in some detail at the state machine generated by the C# compiler, and there were two aspects we couldn’t understand: Why the generated … Read more
How can I wait for a void async method to finish its job? for example, I have a function like below: async void LoadBlahBlah() { await blah(); … } now I want to make sure that everything has been loaded before continuing somewhere else. 7 Answers 7
On December 1, 2009, Google announced support for asynchronous Google Analytics tracking. The asynchronous tracking is achieved using the async directive for the <script> tag. Which browsers support the async directive (<script async=”async” />) and since which version? 6 Answers 6
I was wondering if there’s any library for asynchronous method calls in Python. It would be great if you could do something like @async def longComputation(): <code> token = longComputation() token.registerCallback(callback_function) # alternative, polling while not token.finished(): doSomethingElse() if token.finished(): result = token.result() Or to call a non-async routine asynchronously def longComputation() <code> token = … Read more
I’ve been reading nodebeginner And I came across the following two pieces of code. The first one: var result = database.query(“SELECT * FROM hugetable”); console.log(“Hello World”); The second one: database.query(“SELECT * FROM hugetable”, function(rows) { var result = rows; }); console.log(“Hello World”); I get what they’re supposed to do, they query the database to retrieve … Read more
I’ve got a PHP script that needs to invoke a shell script but doesn’t care at all about the output. The shell script makes a number of SOAP calls and is slow to complete, so I don’t want to slow down the PHP request while it waits for a reply. In fact, the PHP request … Read more