yield-keyword

In Scala language, I want to write a function that yields odd numbers within a given range. The function prints some log when iterating even numbers. The first version of the function is: def getOdds(N: Int): Traversable[Int] = { val list = new mutable.MutableList[Int] for (n <- 0 until N) { if (n % 2 == 1) { list += n } else { println("skip even number " + n) } } return list } If I omit printing logs, the implementation become very simple: def getOddsWithoutPrint(N: Int) = for (n <- 0 until N if (n % 2 == 1)) yield n However, I don't want to miss the logging part. How do I rewrite the first

I need to generate multiple results but one at a time, as opposed to everything at once in an array. How do I do that in Matlab with a generator like syntax as in Python? When executing functions that use the yield keyword, they actually return a generator. Generators are a type of iterators. While MATLAB does not provide the syntax for either, you can implement the "iterator interface" yourself. Here is an example similar to xrange function in python: classdef rangeIterator < handle properties (Access = private) i n end methods function obj = rangeIterator(n) obj.i = 0; obj.n = n; end

Is it possible to use yield as an iterator without evaluation of every value? It is a common task when it is easy to implement complex list generation, and then you need to convert it into Iterator , because you don't need some results... Sure. Actually, there are three options for non-strictness, which I list below. For the examples, assume: val list = List.range(1, 10) def compute(n: Int) = { println("Computing "+n) n * 2 } Stream . A Stream is a lazily evaluated list. It will compute values on demand, but it will not recompute values once they have been computed. It is most useful if you'll

The following is okay: try { Console.WriteLine("Before"); yield return 1; Console.WriteLine("After"); } finally { Console.WriteLine("Done"); } The finally block runs when the whole thing has finished executing ( IEnumerator<T> supports IDisposable to provide a way to ensure this even when the enumeration is abandoned before it finishes). But this is not okay: try { Console.WriteLine("Before"); yield return 1; // error CS1626: Cannot yield a value in the body of a try block with a catch clause Console.WriteLine("After"); } catch (Exception e) { Console.WriteLine(e.Message); } Suppose (for the

I am a little bit confused about the use of yield() method in Java, specifically in the example code below. I've also read that yield() is 'used to prevent execution of a thread'. My questions are: I believe the code below result in the same output both when using yield() and when not using it. Is this correct? What are, in fact, the main uses of yield() ? In what ways is yield() different from the join() and interrupt() methods? The code example: public class MyRunnable implements Runnable { public static void main(String[] args) { Thread t = new Thread(new MyRunnable()); t.start(); for(int i