ArrayUtils.cs

using System;

namespace GameDevWare.Dynamic.Expressions
{
	internal static class ArrayUtils
	{
		private class EmptyArray<T>
		{
			public static T[] Value = new T[0];
		}

		public static ResultT[] ConvertAll<T, ResultT>(this T[] array,
#if NETSTANDARD
			Func<T, ResultT> converter
#else
			Converter<T, ResultT> converter
#endif
		)
		{
			if (array == null) throw new ArgumentNullException("array");
			if (converter == null) throw new ArgumentNullException("converter");

#if NETSTANDARD
			var result = new ResultT[array.Length];
			for (var i = 0; i < array.Length; i++)
				result[i] = converter(array[i]);
			return result;
#else

			return Array.ConvertAll(array, converter);
#endif
		}
		public static T[] Empty<T>()
		{
#if NETCOREAPP
			return Array.Empty<T>();
#else
			return EmptyArray<T>.Value;
#endif
		}
	}
}