int extensions. Mostly usefull for index array manipulation.

intExtensions.cs

using UnityEngine;
using System.Collections;

public static class intExtensions
{
	public static bool CheckIndex(this int index, ICollection col)
	{
		return ((index >= 0) && (index < col.Count));
		
	}// CheckIndex()

	public static int Next(this int index, ICollection col) { return Step(index, 1, col); }

	public static int Previous(this int index, ICollection col) { return Step(index, -1, col); }

	public static int Step(this int index, int step, ICollection col)
	{
		index += step;

		if(index < 0) index = col.Count - 1;

		if(index > col.Count) index = 0;

		return index;

	}// Step()
	
	public static int ClampIndex(this int index, ICollection col)
	{
		return Mathf.Clamp(index, 0, col.Count - 1);
		
	}// ClampIndex()
	
}// intExtensions