closures

问题 I have a function: setInterval(function () { var counter = 0; (function() { counter = counter + 1; console.log(counter); })(counter) }, 1000) Why does not it increment the counter? (instead, it logs 1's). How to make it log ascending numbers? (1, 2, 3, ....) 回答1: You are passing an argument to your anonymous function, but you aren't assigning that argument to a variable. You forgot to put the arguments in the function definition. You are creating new variables with every iteration instead of

问题 I have a function: setInterval(function () { var counter = 0; (function() { counter = counter + 1; console.log(counter); })(counter) }, 1000) Why does not it increment the counter? (instead, it logs 1's). How to make it log ascending numbers? (1, 2, 3, ....) 回答1: You are passing an argument to your anonymous function, but you aren't assigning that argument to a variable. You forgot to put the arguments in the function definition. You are creating new variables with every iteration instead of

问题 Disclaimer: just starting to play with Spark. I'm having troubles understanding the famous "Task not serializable" exception but my question is a little different from those I see on SO (or so I think). I have a tiny custom RDD ( TestRDD ). It has a field which stores objects whose class does not implement Serializable ( NonSerializable ). I've set the "spark.serializer" config option to use Kryo. However, when I try count() on my RDD, I get the following: Caused by: java.io

问题 I have a general struct with settings and an extra variable setting that I want to tune and play around with. For all possible values in an integer range, I want to start a (scoped) thread with this variable set to that value. Depending on this value, they do slightly different work. Each of these threads should be able to read the general settings struct. use crossbeam; // 0.7.3 struct Settings { // ... many fields } const MAX_FEASIBLE_SCORE: u8 = 10; fn example(settings: Settings) {

问题 I have a general struct with settings and an extra variable setting that I want to tune and play around with. For all possible values in an integer range, I want to start a (scoped) thread with this variable set to that value. Depending on this value, they do slightly different work. Each of these threads should be able to read the general settings struct. use crossbeam; // 0.7.3 struct Settings { // ... many fields } const MAX_FEASIBLE_SCORE: u8 = 10; fn example(settings: Settings) {

问题 why does typealias closure not transmit data and output nothing to the console? How to fix it? class viewModel: NSObject { var abc = ["123", "456", "789"] typealias type = ([String]) -> Void var send: type? func createCharts(_ dataPoints: [String]) { var dataEntry: [String] = [] for item in dataPoints { dataEntry.append(item) } send?(dataEntry) } override init() { super.init() self.createCharts(abc) } } class ViewController: UIViewController { var viewModel: viewModel = viewModel() func type(

问题 why does typealias closure not transmit data and output nothing to the console? How to fix it? class viewModel: NSObject { var abc = ["123", "456", "789"] typealias type = ([String]) -> Void var send: type? func createCharts(_ dataPoints: [String]) { var dataEntry: [String] = [] for item in dataPoints { dataEntry.append(item) } send?(dataEntry) } override init() { super.init() self.createCharts(abc) } } class ViewController: UIViewController { var viewModel: viewModel = viewModel() func type(

问题 Hello guys I'm trying to make a simple and re-usable Swift Network Layer Maybe it's not the best way to loop returned data in view but after I tried to get the returned Api data to Loop it in SwiftUI view I'm getting error : Escaping closure captures mutating 'self' parameter And don't know where or what i missed in this lesson and here's a picture of the file ContentView.swift struct ContentView: View { var emptyDataArr: [CollectionItem] = [] init() { ServiceLayer.request(router: Router

问题 I am taking my first steps on Actix-Web. But this closure causes me errors #[derive(Deserialize, Serialize, Debug, Copy, Clone)] pub struct PaginationQuery { pub limit: Option<u32>, pub offset: Option<u32>, } pub fn get_all_trainings_2( query: web::Query<PaginationQuery>, pool: web::Data<Pool>, ) -> impl Future<Item = HttpResponse, Error = Error> { let mut pagination = query.0; // Thread Blocking web::block(move || database::get_exercises(pool, pagination)).then(|res| { match res { Ok(

问题 I am taking my first steps on Actix-Web. But this closure causes me errors #[derive(Deserialize, Serialize, Debug, Copy, Clone)] pub struct PaginationQuery { pub limit: Option<u32>, pub offset: Option<u32>, } pub fn get_all_trainings_2( query: web::Query<PaginationQuery>, pool: web::Data<Pool>, ) -> impl Future<Item = HttpResponse, Error = Error> { let mut pagination = query.0; // Thread Blocking web::block(move || database::get_exercises(pool, pagination)).then(|res| { match res { Ok(