Ruby equivalent of C#'s 'yield' keyword, or, creating sequences without preallocating memory

Question

In C#, you could do something like this:

public IEnumerable GetItems()
{
    for (int i=0; i<10000000; i++) {
        yield return i;
           


        

Answer 1

Without having much ruby experience, what C# does in yield return is usually known as lazy evaluation or lazy execution: providing answers only as they are needed. It's not about allocating memory, it's about deferring computation until actually needed, expressed in a way similar to simple linear execution (rather than the underlying iterator-with-state-saving).

A quick google turned up a ruby library in beta. See if it's what you want.