JensKrumsieck/ChemSharp

namespace ChemSharp.Generator.Extension;

public static class LinqExtensions
{
    public static IEnumerable<TSource> DistinctBy<TSource, TKey>
        (this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
    {
        var seenKeys = new HashSet<TKey>();
        foreach (var element in source)
            if (seenKeys.Add(keySelector(element)))
                yield return element;
    }
}