Lists

// System.Lists — System.Core (decompiled from Larva HIR)

into namespace System
{
	/// What List<T> offers when its items can be compared or tested for equality.
	public static class Lists
	{
		public:
			/// The total of a list of numbers (0 when empty).
			Sum<T : INumber<T>>(List<T> list) : T => Array.Sum(list.Items(), 0, list.Count);

			/// The smallest and largest; the list must not be empty.
			Min<T : INumber<T>>(List<T> list) : T => Array.Min(list.Items(), 0, list.Count);

			Max<T : INumber<T>>(List<T> list) : T => Array.Max(list.Items(), 0, list.Count);

			Average<T : INumber<T>, (f64)T>(List<T> list) : f64 => (f64)Sum(list) / (f64)list.Count;

			Sort<T : IComparable<T>>(List<T> list)
			{
				Array.Sort(list.Items(), 0, list.Count);
			}

			IndexOf<T : IHashable<T>>(List<T> list, T value) : i32
			{
				T[] items = list.Items();
				loop (i32 i = 0..list.Count)
				{
					if (items[i].Equals(value))
						return i;
				}
				return -1;
			}

			Contains<T : IHashable<T>>(List<T> list, T value) : bool => IndexOf(list, value) >= 0;

			/// Takes out the first item equal to `value`; false when there is none.
			Remove<T : IHashable<T>>(List<T> list, T value) : bool
			{
				i32 at = IndexOf(list, value);
				if (at < 0)
					return false;
				list.RemoveAt(at);
				return true;
			}
	}
}