A simple state machine using a dictionary of delegates indexed by an enum.

MyStateMachine.cs

using UnityEngine;
using System.Collections.Generic; 


public class MyStateMachine : MonoBehaviour
{
	public delegate void StateHandlerDelegate ();
	
	
	public enum MyStateType
	{
		Idle,
		Combat,
		Juggling
	}
	
	
	private Dictionary<MyStateType, StateHandlerDelegate> m_StateHandlers;
	private MyStateType m_State;
	
	
	void Start ()
	{
		m_StateHandlers = new Dictionary<MyStateType, StateHandlerDelegate> ();
		m_StateHandlers[MyStateType.Idle] = IdleHandler;
		m_StateHandlers[MyStateType.Combat] = CombatHandler;
		m_StateHandlers[MyStateType.Juggling] = JugglingHandler;
	}
	
	
	void Update ()
	{
		m_StateHandlers[m_State] ();
	}
	
	
	void IdleHandler ()
	{
		// Handle the state and set m_State to change to another state
	}
	
	
	void CombatHandler ()
	{
		// Handle the state and set m_State to change to another state
	}
	
	
	void JugglingHandler ()
	{
		// Handle the state and set m_State to change to another state
	}
}