There are apparently many ways to iterate over a collection. Curious if there are any differences, or why you’d use one way over the other. First type: List<string> someList = <some way to init> foreach(string s in someList) { <process the string> } Other Way: List<string> someList = <some way to init> someList.ForEach(delegate(string s) { … Read more
In Java, it’s possible to have methods inside an enum. Is there such possibility in C# or is it just a string collection and that’s it? I tried to override ToString() but it does not compile. Does someone have a simple code sample? 6 Answers 6
Are there any best-practice guidelines on when to use case classes (or case objects) vs extending Enumeration in Scala? They seem to offer some of the same benefits. 14 Answers 14
I’m new to programming. Can someone explain what .map would do in: params = (0…param_count).map 8 Answers 8
I am finding some difficulty in accessing mutable dictionary keys and values in Objective-C. Suppose I have this: NSMutableDictionary *xyz=[[NSMutableDictionary alloc] init]; I can set keys and values. Now, I just want to access each key and value, but I don’t know the number of keys set. In PHP it is very easy, something as … Read more
I’m looking for the standard idiom to iterate over an NSArray. My code needs to be suitable for OS X 10.4+. 8 Answers 8 The generally-preferred code for 10.5+/iOS. for (id object in array) { // do something with object } This construct is used to enumerate objects in a collection which conforms to the … Read more
Is there a function that I can use to iterate over an array and have both index and element, like Python’s enumerate? for index, element in enumerate(list): … 17 s 17 Yes. As of Swift 3.0, if you need the index for each element along with its value, you can use the enumerated() method to … Read more
I know that PHP doesn’t yet have native Enumerations. But I have become accustomed to them from the Java world. I would love to use enums as a way to give predefined values which IDEs’ auto-completion features could understand. Constants do the trick, but there’s the namespace collision problem and (or actually because) they’re global. … Read more
How can you enumerate an enum in C#? E.g. the following code does not compile: public enum Suit { Spades, Hearts, Clubs, Diamonds } public void EnumerateAllSuitsDemoMethod() { foreach (Suit suit in Suit) { DoSomething(suit); } } And it gives the following compile-time error: ‘Suit’ is a ‘type’ but is used like a ‘variable’ It … Read more
