closures

问题 This code works as expected (output is j.doe ): class Sample { Closure formatFirstName Closure formatLastName void doStuff (String fname, String lname, Closure callback) { formatFirstName(fname) { String fnameError, String formattedFname -> formatLastName(lname) { String lnameError, String formattedLname -> String errors = "${fnameError ? "${fnameError}, " : ''}${lnameError ?: ''}" callback(errors, formattedFname, formattedLname) } } } } Closure ffn = { String fname, Closure callback ->

问题 In my tests I had a helper function that runs a given method on differently configured objects, with a simplified version looking like this: fn run_method<F>(f: F) where F: Fn(&Foo), { let to_test = vec![0i32]; to_test .iter() .map(|param| { let foo = Foo(*param); f(&foo); }) .for_each(drop); } // run_method(Foo::run); This worked fine until I added references to the tested struct, making it "lifetime-annotated" (for lack of a proper term, I mean Foo<'a> ). Now I get an error indicating, I

问题 i'm try to solve this completion block, but I keep having many warning. Xcode give me warning Cannot convert return expression of type '()' to return type '[AirportModel]' Sorry I'm a beginner... little lost on this closure... I have to return this vector of AirportModel in order to be display in a list in swiftUI, I want use DispatchQueue in order to avoid to block the view while searching: func filter (valoreSearhed: String, arrayTosearh: AirportVector, completionBlock: (_ airports:

问题 function foreignCoordinatesArray(){ var coordinates = []; $.getJSON('/critics.json?travel_id=' + $('#foreign_travel').val(), success); function success(ary) { for(var a in ary){ var obj = ary[a]; coordinates.push(new google.maps.LatLng(obj.latitude, obj.longitude)); } } console.log(coordinates); } At the end coordinates will still be [] and not [{...},{...},...]. I guess this must be a problem with closures How can I have my desired value in coordinates array? 回答1: It's not a problem with

问题 I've been reading the mozdev article on closures and it has this fiddle example: function makeSizer(size) { return function() { document.body.style.fontSize = size + 'px'; }; } the idea is to call makeSizer with a size, from an on-click event and it changes the font size. But if you cut out the nameless function and just do this: function makeSizer(size) { document.body.style.fontSize = size + 'px'; } the clickable links stop having any effect and font size goes directly to the largest, as if

问题 I found similar questions while searching for a solution for my problem but I don't think its quite that what I'm looking for. Using jQuery's .on() is no brainer for binding events on dynamically created elements, but I got stuck while trying to pass different parameters to call different functions. After reading https://developer.mozilla.org/en/JavaScript/Guide/Closures I came up with the following working example, but I would like to know if its the best way to do it or if there is a more

问题 I found similar questions while searching for a solution for my problem but I don't think its quite that what I'm looking for. Using jQuery's .on() is no brainer for binding events on dynamically created elements, but I got stuck while trying to pass different parameters to call different functions. After reading https://developer.mozilla.org/en/JavaScript/Guide/Closures I came up with the following working example, but I would like to know if its the best way to do it or if there is a more

问题 Trying to learn groovy closures, before writing jenkins pipeline as script. Below code: def scores = [72,29,32,44,56] def analyse(closure){ closure(scores) } def firstScore(array){ return array[0] } analyse(firstScore) gives error: groovy.lang.MissingPropertyException: No such property: firstScore for class: groovy.lang.Binding at groovy.lang.Binding.getVariable(Binding.java:63) How to resolve this error? 回答1: You see this error because firstScore is a method and not a closure in your code

问题 I'm working on closure so hard, and I know that in the loop, new function refer closure using the last value of the iterator so the following function's result is three times "item3 undefined" function buildList(list) { var result = []; for (var i = 0; i < list.length; i++) { var item = 'item' + list[i]; result.push( function() {alert(item + ' ' + list[i])} ); } return result; } function testList() { var fnlist = buildList([1,2,3]); // using j only to help prevent confusion - could use i for

问题 I know this is the realm of closures and what not. But is it possible to continuously call nested anonymouse funtions? Say I have this: function testing(input) { var testing = 0; (function() { testing = testing + 1; })() return "testing"; } Can we have something like this testing()()()()()()() ? 回答1: You could use an inner function which makes the update and has a toString method to get a primitive value. function testing() { function fn() { string += ++counter; return fn; } var counter = 0,