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.NET C# To Batch - converting a list, array, enumerable to a set of batches

Arti answered on November 25, 2022 Popularity 1/10 Helpfulness 1/10

answer .NET C# To Batch - converting a list, array, enumerable to a set of batches

.NET C# To Batch - converting a list, array, enumerable to a set of batches

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public static IEnumerable<TResult> Batch<TSource, TResult>(this IEnumerable<TSource> source, int size,
    Func<IEnumerable<TSource>, TResult> resultSelector)
{
    if (source == null) throw new ArgumentNullException(nameof(source));
    if (size <= 0) throw new ArgumentOutOfRangeException(nameof(size));
    if (resultSelector == null) throw new ArgumentNullException(nameof(resultSelector));

    switch (source)
    {
        case ICollection<TSource> collection when collection.Count <= size:
            {
                return _(); IEnumerable<TResult> _()
                {
                    var bucket = new TSource[collection.Count];
                    collection.CopyTo(bucket, 0);
                    yield return resultSelector(bucket);
                }
            }
        case IReadOnlyList<TSource> list when list.Count <= size:
            {
                return _(); IEnumerable<TResult> _()
                {
                    var bucket = new TSource[list.Count];
                    for (var i = 0; i < list.Count; i++)
                        bucket[i] = list[i];
                    yield return resultSelector(bucket);
                }
            }
        case IReadOnlyCollection<TSource> collection when collection.Count <= size:
            {
                return Batch(collection.Count);
            }
        default:
            {
                return Batch(size);
            }

            IEnumerable<TResult> Batch(int ss)
            {
                TSource[] bucket = null;
                var count = 0;

                foreach (var item in source)
                {
                    if (bucket == null)
                        bucket = new TSource[ss];

                    bucket[count++] = item;

                    // The bucket is fully buffered before it's yielded
                    if (count != ss)
                        continue;

                    yield return resultSelector(bucket);

                    bucket = null;
                    count = 0;
                }

                // Return the last bucket with all remaining elements
                if (bucket != null && count > 0)
                {
                    Array.Resize(ref bucket, count);
                    yield return resultSelector(bucket);
                }
            }
    }
}

Popularity 1/10 Helpfulness 1/10 Language csharp

Source: Grepper

Tags: .net c# enumerable set

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Contributed on Nov 25 2022

Arti

0 Answers Avg Quality 2/10

.NET C# To Batch - converting a list, array, enumerable to a set of batches

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