using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Auth.Core.Utility;

public static class IEnumerableExtensions
{
    public static IEnumerable<List<T>> Batch<T>(this IEnumerable<T> source, int batchSize)
    {
        var batch = new List<T>(batchSize);
        foreach (var item in source)
        {
            batch.Add(item);
            if (batch.Count == batchSize)
            {
                yield return batch;
                batch = new List<T>(batchSize);
            }
        }
        if (batch.Count > 0)
        {
            yield return batch;
        }
    }
}