using System.Linq.Expressions;

// ReSharper disable once CheckNamespace
namespace System.Linq
{
    public static class Queryable
    {
        /// <summary>
        /// Makes a where filtering, if it is not null.
        /// </summary>
        public static IQueryable<TSource> WhereOrDefault<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>>? predicate)
        {
            if (source == null) throw new ArgumentNullException(nameof(source));
            return predicate is null ? source : source.Where(predicate);
        }
    }
}