lambda

问题 I have a List<string> of sizes, say XS, S, M, L, XL, XXL, UK 10, UK 12 etc What I want is to force the order to be that of above, regardless of the order of items in the list, I think I need a IComparable operator but unsure. Ideally I want to have another List with the correct order in which it can reference it's 'place' in the list and re-sort itself, if it doesn't exist it will default to A-Z 回答1: Create an array of sizes in the order you want them to be in, then sort the shirts by the

问题 I have a List<string> of sizes, say XS, S, M, L, XL, XXL, UK 10, UK 12 etc What I want is to force the order to be that of above, regardless of the order of items in the list, I think I need a IComparable operator but unsure. Ideally I want to have another List with the correct order in which it can reference it's 'place' in the list and re-sort itself, if it doesn't exist it will default to A-Z 回答1: Create an array of sizes in the order you want them to be in, then sort the shirts by the

问题 I am using a library with a method where I call a method that takes an event class and a consumer to call when the event fires. This method returns a void. I need to call the method again in the consumer then in that consumer call it again etc. (a lot of times). How can I put this in a for loop to avoid typing out this method loads of times? Code: ShurikenBot.getInstance().getEventWaiter().waitForEvent(MessageReactionAddEvent.class, t -> t.getMessageId().equals(m.getId()) && event.getAuthor()

问题 I was wondering what is the exact functionality of the "Stage" in the API gateway console. What I am trying to achieve is. To have the same resources with the same HTTP methods point to different lambda function in different stages. my development URL point to my development lambda and my production URL point to the production lambda. will it be possible? 回答1: Yes it is possible through stage variables. The variables allow you to invoke different functions depending on the used stage. This is

问题 I have the following lambda calculus: 1) λx . katze(x)(Garfield) 2) λP . λx . P(x)(tea) 3) λy . λx . likes(x, y)(Mia) How do I reduce them with the Beta Reduction? My solutions: 1) katze (Garfield) 2) tea 3) likes(Mia) 回答1: When performing beta reduction, you substitute the bound variable to the lambda function with the value supplied. The notation for that is [param := value] and you pick up the first variable that is given. In the case λx . katze(x)(Garfield) -> katze (Garfield) the

问题 I have a DTO field in DateTime format public DateTime date_joined { get; set; } I use this to turn the data into a Json public JsonResult Customer(int? id) { var user = User.Identity.Name; if (!AccountController.IsInRole(user, "admin")) { return null; } id = id == null ? 0 : id; var customer = db.PrmCustomers .Where(x => x.EmailAddress != null && x.CustomerID > id) .OrderBy(x => x.CustomerID) .Select(x => new CustomerDTO() { email = x.EmailAddress, phone = x.MobilePhoneNumber, username = "",

问题 I have a function with including if, else condition and for loop. I want to write this function inside a lambda expression. I tried from many ways to create this lambda function. But still I couldn't do it. This is my function with another rules. negation ='no,not,never'.split(',') list2 = 'miss,loss,gone,give up,lost'.split(',') def f(sentence): s = sentence.split() l = [s.index(word) for word in s if word in list2] # Will returns list of indices (of sentence) where word is in list2 if len(l

问题 I have a function with including if, else condition and for loop. I want to write this function inside a lambda expression. I tried from many ways to create this lambda function. But still I couldn't do it. This is my function with another rules. negation ='no,not,never'.split(',') list2 = 'miss,loss,gone,give up,lost'.split(',') def f(sentence): s = sentence.split() l = [s.index(word) for word in s if word in list2] # Will returns list of indices (of sentence) where word is in list2 if len(l

问题 I encountered something that bugs me when I wrote some code. I gathered the two examples in the code sample below. The cls1 line uses a lambda expression but doesn't compile, while the cls2 line uses a method references and compiles. I know that if I'm using non generic objects, I have no issues there, but here, I'm using generics, and, more specifically, wildcards. import java.lang.annotation.*; import java.util.Optional; public class MCVE { static class Foo {} static class Bar extends Foo {

问题 I would like to create a function to retrieve a List of a given property name's Type. But i dont know yet how to create a working lambda selector. public IList<object> GetDistinctListOfProperty(string propertyName) { var propInfoByName = typeof(T).GetProperty(propertyName); if (propInfoByName == null) return new List<object>(); using (var db = new ApplicationDbContext()) { var lambda = //TODO return db.Set<T>().Select(lambda).Distinct().ToList(); } } 回答1: You can use this method to generate