The yield statement used in a function turns that function into a “generator” (a function that creates an iterator). The resulting iterator is normally resumed by calling next(). However it is possible to send values to the function by calling the method send() instead of next() to resume it: cr.send(1) In your example this would … Read more
In Python 3.3+, you can use yield from. For example, >>> def get_squares(): … yield from (num ** 2 for num in range(10)) … >>> list(get_squares()) [0, 1, 4, 9, 16, 25, 36, 49, 64, 81] It can actually be used with any iterable. For example, >>> def get_numbers(): … yield from range(10) … >>> … Read more
Try this: val x: String = list.mkString This syntax: for (i <- list) yield i is syntactic sugar for: list.map(i => i) and will thus return an unchanged copy of your original list.
A method using yield return must be declared as returning one of the following two interfaces: IEnumerable<SomethingAppropriate> IEnumerator<SomethingApropriate> (thanks Jon and Marc for pointing out IEnumerator) Example: public IEnumerable<AClass> YourMethod() { foreach (XElement header in headersXml.Root.Elements()) { yield return (ParseHeader(header)); } } yield is a lazy producer of data, only producing another item after the … Read more
Thread.Yield will interrupt the current thread to allow other threads to do work. However, if they do not have any work to do, your thread will soon be rescheduled and will continue to poll, thus 100% utilization of 1 core. Causes the calling thread to yield execution to another thread that is ready to run … Read more
Yes! 🙂 def a_method(*params) # … yield if block_given? # … end
No, you can’t use yield inside of the inner function. But in your case you don’t need it. You can always use for-of loop instead of forEach method. It will look much prettier, and you can use continue, break, yield inside it: var trivialGenerator = function *(array) { for (var item of array) { // … Read more
To give a code example, say you want to write an iterator that returns nothing if the source is null or empty. public IEnumerable<T> EnumerateThroughNull<T>(IEnumerable<T> source) { if (source == null) yield break; foreach (T item in source) yield return item; } Without the yield break it becomes impossible to return an empty set inside … Read more
Another way is def empty_generator(): return yield Not really “more expressive”, but shorter. 🙂 Note that iter([]) or simply [] will do as well.
Yes, there is: return iter([])