yield adds a value to the output stream of the surrounding async* function. It’s like return, but doesn’t terminate the function. See https://dart.dev/guides/language/language-tour#generators Stream asynchronousNaturalsTo(n) async* { int k = 0; while (k < n) yield k++; } When the yield statement executes, it adds the result of evaluating its expression to the stream. It … Read more
Yes, you can do this: def infinity(start): yield start for x in infinity(start + 1): yield x This will error out once the maximum recursion depth is reached, though. Starting from Python 3.3, you’ll be able to use def infinity(start): yield start yield from infinity(start + 1) If you just call your generator function recursively … Read more
@content_for_whatever is deprecated. Use content_for? instead, like this: <% if content_for?(:whatever) %> <div><%= yield(:whatever) %></div> <% end %>
Generator Generator[str, None, None] or Iterator[str]
Source: http://www.javamex.com/tutorials/threads/yield.shtml Windows In the Hotspot implementation, the way that Thread.yield() works has changed between Java 5 and Java 6. In Java 5, Thread.yield() calls the Windows API call Sleep(0). This has the special effect of clearing the current thread’s quantum and putting it to the end of the queue for its priority level. In … Read more
I suspect this is a matter of practicality rather than feasibility. I suspect there are very, very few times where this restriction is actually an issue that can’t be worked around – but the added complexity in the compiler would be very significant. There are a few things like this that I’ve already encountered: Attributes … Read more
The two options I know of is Aviad Ben Dov’s infomancers-collections library from 2007 and Jim Blackler’s YieldAdapter library from 2008 (which is also mentioned in the other answer). Both will allow you to write code with yield return-like construct in Java, so both will satisfy your request. The notable differences between the two are: … Read more
Generators exist in C++, just under another name: Input Iterators. For example, reading from std::cin is similar to having a generator of char. You simply need to understand what a generator does: there is a blob of data: the local variables define a state there is an init method there is a “next” method there … Read more
To understand what yield does, you must understand what generators are. And before you can understand generators, you must understand iterables. Iterables When you create a list, you can read its items one by one. Reading its items one by one is called iteration: >>> mylist = [1, 2, 3] >>> for i in mylist: … Read more
What are the cases where use of yield will be limiting, unnecessary, get me into trouble, or otherwise should be avoided? It’s a good idea to think carefully about your use of “yield return” when dealing with recursively defined structures. For example, I often see this: public static IEnumerable<T> PreorderTraversal<T>(Tree<T> root) { if (root == … Read more