C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.Threading.Tasks;
using System.Reactive;
using System.Reactive.Linq;
using System.Reactive.Concurrency;

public class Program
{
    public static IObservable<TResult> Generate<TResult>(
        Func<Task<TResult>> initialState,
        Func<TResult, bool> condition,
        Func<TResult, Task<TResult>> iterate,
        Func<TResult, TResult> resultSelector,
        IScheduler scheduler = null)
    {
        scheduler ??= Scheduler.Immediate;
        return Observable.Create<TResult>(observer =>
        {
            return scheduler.ScheduleAsync(async (self, cancellationToken) =>
            {
                var state = await initialState();
                while (condition(state))
                {
                    await self.Yield();
                    observer.OnNext(resultSelector(state));
                    state = await iterate(state);
                }
                observer.OnCompleted();
            });
        });
    }
}

​x
 
using System;
using System.Threading.Tasks;
using System.Reactive;
using System.Reactive.Linq;
using System.Reactive.Concurrency;
​
public class Program
{
    public static IObservable<TResult> Generate<TResult>(
        Func<Task<TResult>> initialState,
        Func<TResult, bool> condition,
        Func<TResult, Task<TResult>> iterate,
        Func<TResult, TResult> resultSelector,
        IScheduler scheduler = null)
    {
        scheduler ??= Scheduler.Immediate;
        return Observable.Create<TResult>(observer =>
        {
            return scheduler.ScheduleAsync(async (self, cancellationToken) =>
            {
                var state = await initialState();
                while (condition(state))
                {
                    await self.Yield();
                    observer.OnNext(resultSelector(state));
                    state = await iterate(state);
                }
                observer.OnCompleted();
            });
        });
    }
}
​

Total marbles: 512
Working set has 25 marbles with [red] as a characteristic
Working set has 29 marbles with [sticky] as a characteristic
Working set has 31 marbles with [smelly] as a characteristic
Working set has 33 marbles with [brass] as a characteristic
Working set has 27 marbles with [hollow] as a characteristic
Working set has 28 marbles with [jingly] as a characteristic
Working set has 29 marbles with [heated] as a characteristic
Working set has 38 marbles with [sweet] as a characteristic
Working set has 23 marbles with [forbidden] as a characteristic
Working set has 487 marbles with [not red] as a characteristic
Working set has 483 marbles with [not sticky] as a characteristic
Working set has 481 marbles with [not smelly] as a characteristic
Working set has 479 marbles with [not brass] as a characteristic
Working set has 485 marbles with [not hollow] as a characteristic
Working set has 484 marbles with [not jingly] as a characteristic
Working set has 483 marbles with [not heated] as a characteristic
Working set has 474 marbles with [not sweet] as a characteristic
Working set has 489 marbles with [not forbidden] as a characteristic
Made 5120 selections
Selected 250 marbles with red - expected 250
Selected 295 marbles with sticky - expected 290
Selected 301 marbles with smelly - expected 310
Selected 294 marbles with brass - expected 330 -> This was underrepresented by 10.909096%
Selected 259 marbles with hollow - expected 270
Selected 274 marbles with jingly - expected 280
Selected 306 marbles with heated - expected 290 -> This was overrepresented by 5.5172424%
Selected 353 marbles with sweet - expected 380 -> This was underrepresented by 7.1052628%
Selected 225 marbles with forbidden - expected 230

Cached Result
Last Run:	8:43:33 pm
Compile:	0.016s
Execute:	0.07s
Memory:	4.77Mb
CPU:	0.086s

View IL Code