IterableExtensions.cs

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using System.Collections;
using System.Collections.Generic;
using System.Linq;
 
using java.util;
 
namespace java.lang
{
 
    public static class IterableExtensions
    {
 
        public static IEnumerable<T> AsEnumerable<T>(this Iterable iterable) => iterable switch
        {
            IEnumerable<T> i => i,
            IEnumerable i => i.Cast<T>(),
            Collection i => i.AsCollection<T>(),
            Iterable i => new IterableWrapper<T>(i),
        };
 
    }
 
}