enumerator

When using let directoryEnumerator = FileManager().enumerator(at: ... in Swift 3, I get all files from the folder, e.g. "file:///Volumes/MacOS/fasttemp/Fotos/" The results are not including the leading path (here "/Volumes/MacOS"). So I get "file:///fasttemp/Fotos/2005/" How can I get the fullpath (directly from the enumerator) or convert them. I want to use URL functions, not string function manipulating by assumptions. If "MacOS" is the name of your current startup disk then "/Volumes/MacOS" is a symbolic link to "/", so both "/fasttemp/Fotos/2005/" and "/Volumes/MacOS/fasttemp/Fotos/" are

I want to call a common enumerator from different threads. When I do the following, enum = (0..1000).to_enum t1 = Thread.new do p enum.next sleep(1) end t2 = Thread.new do p enum.next sleep(1) end t1.join t2.join it raises an error: Fiber called across threads. when enum is called from t2 after once being called from t1 . Why is Ruby designed to not allow an enumerator (or fiber) to be called across threads, and Is there an alternative way to provide a similar function? I am guessing that atomicity of an operation on an enumerator/fiber is relevant here, but am not fully sure. If that is the

I've written a function similar to Data.Enumerator.List.map that makes an Iteratee compatible with an Enumerator that feeds a different Stream type. import Data.Enumerator test :: Monad m => (ao -> ai) -> Iteratee ai m b -> Iteratee ao m b test f iter = go $$ iter where go (Continue k) = continue $ \stream -> go $$ k (fmap f stream) go (Yield res _) = yield res EOF If I omit the type signature for go , this will work just fine. However, I'd like to include it but I'm unable to determine what the correct signature should be. Here's what I think it should be: go :: Monad m => Step ai m b ->

Context: C# 3.0, .Net 3.5 Suppose I have a method that generates random numbers (forever): private static IEnumerable<int> RandomNumberGenerator() { while (true) yield return GenerateRandomNumber(0, 100); } I need to group those numbers in groups of 10, so I would like something like: foreach (IEnumerable<int> group in RandomNumberGenerator().Slice(10)) { Assert.That(group.Count() == 10); } I have defined Slice method, but I feel there should be one already defined. Here is my Slice method, just for reference: private static IEnumerable<T[]> Slice<T>(IEnumerable<T> enumerable, int size) { var

I have two arrays built while parsing a text file. The first contains the column names, the second contains the values from the current row. I need to iterate over both lists at once to build a map. Right now I have the following: var currentValues = currentRow.Split(separatorChar); var valueEnumerator = currentValues.GetEnumerator(); foreach (String column in columnList) { valueEnumerator.MoveNext(); valueMap.Add(column, (String)valueEnumerator.Current); } This works just fine, but it doesn't quite satisfy my sense of elegance, and it gets really hairy if the number of arrays is larger than