I come from OOP background and trying to learn python. I am using the max function which uses a lambda expression to return the instance of type Player having maximum totalScore among the list players. def winner(): w = max(players, key=lambda p: p.totalScore) The function correctly returns instance of type Player having maximum totalScore. I … Read more
This question already has answers here: Multiple “order by” in LINQ (7 answers) Closed 4 years ago. I start with a basic class that I want to manipulate in a List using LINQ, something like the following: public class FooBar { public virtual int Id { get; set; } public virtual string Foo { get; … Read more
This question already has answers here: Unsubscribe anonymous method in C# (13 answers) How do I Unregister ‘anonymous’ event handler [duplicate] (7 answers) Closed 6 months ago. I recently discovered that I can use lambdas to create simple event handlers. I could for example subscribe to a click event like this: button.Click += (s, e) … Read more
In C++11, is there a way to template a lambda function? Or is it inherently too specific to be templated? I understand that I can define a classic templated class/functor instead, but the question is more like: does the language allow templating lambda functions? 12 Answers 12
I know in normal Linq grammar, orderby xxx descending is very easy, but how do I do this in Lambda expression? 6 Answers 6
I have a foreach loop reading a list of objects of one type and producing a list of objects of a different type. I was told that a lambda expression can achieve the same result. var origList = List<OrigType>(); // assume populated var targetList = List<TargetType>(); foreach(OrigType a in origList) { targetList.Add(new TargetType() {SomeValue = … Read more
The question is confusing, but it is much more clear as described in the following codes: List<List<T>> listOfList; // add three lists of List<T> to listOfList, for example /* listOfList = new { { 1, 2, 3}, // list 1 of 1, 3, and 3 { 4, 5, 6}, // list 2 { 7, 8, … Read more
I’ve got this code: private async void ContextMenuForGroupRightTapped(object sender, RightTappedRoutedEventArgs args) { CheckBox ckbx = null; if (sender is CheckBox) { ckbx = sender as CheckBox; } if (null == ckbx) { return; } string groupName = ckbx.Content.ToString(); var contextMenu = new PopupMenu(); // Add a command to edit the current Group contextMenu.Commands.Add(new UICommand(“Edit this … Read more
I get this pep8 warning whenever I use lambda expressions. Are lambda expressions not recommended? If not why? 5 Answers 5
Let’s say I have the following functional interface in Java 8: interface Action<T, U> { U execute(T t); } And for some cases I need an action without arguments or return type. So I write something like this: Action<Void, Void> a = () -> { System.out.println(“Do nothing!”); }; However, it gives me compile error, I … Read more
