Detect edges for a simple moving enemy controller and apply movement

2DEnemyController.cs

using UnityEngine;
using System.Collections;

public class 2DEnemyController : MonoBehaviour {

	// should we flip our enemy?
	public bool isFlipped = false;

  	// used for Rotation
	private Vector3 r = Vector3.zero;
	
	// Update is called once per frame

	void FixedUpdate(){
	  // if we hit the left edge
		if( !leftCheck() )
		{
		  // flip the sprite
			isFlipped = false;
		}
		// do we hit the right edge?
		if( !rightCheck() )
		{
		  // flip it back!
			isFlipped = true;
		}
		// keep the enemy moving at a speed horizontally
		gameObject.transform.Translate(0.01f,0,0);
		// now we actually flip stuff with euler angles.. not as messy.
		if(	isFlipped )
		{
			r.y = 180;
		}
		else
		{
			r.y = 0;
		}
		gameObject.transform.eulerAngles = r;
	}

  // simple bool function to check left edge of feet
	bool leftCheck()
	{
		float extraRayLength = 0.1f;
		float extraRayWidth = 0.02f;
		Vector3 startOfRay = gameObject.transform.position;
		Vector3 lstartOfRay = startOfRay+(Vector3.left* (extraRayWidth + gameObject.collider2D.bounds.size.y/2.0f));
		
		Vector3 endOfRay = gameObject.transform.position - (Vector3.up* (extraRayLength + gameObject.collider2D.bounds.size.y/2.0f) );
		Vector3 lendOfRay = endOfRay + (Vector3.left* (extraRayWidth + gameObject.collider2D.bounds.size.y/2.0f));

		Debug.DrawLine( lstartOfRay, lendOfRay, Color.blue );
		
		RaycastHit2D hitLeft = Physics2D.Linecast( lstartOfRay, lendOfRay, 1 << LayerMask.NameToLayer( "Ground" ) );

		return hitLeft;
	}

  // now let's do it for the right side
	bool rightCheck()
	{
		float extraRayLength = 0.1f;
		float extraRayWidth = 0.02f;
		Vector3 startOfRay = gameObject.transform.position;
		Vector3 rstartOfRay = startOfRay-(Vector3.left* (extraRayWidth + gameObject.collider2D.bounds.size.y/2.0f));
		
		
		Vector3 endOfRay = gameObject.transform.position - (Vector3.up* (extraRayLength + gameObject.collider2D.bounds.size.y/2.0f) );
		Vector3 rendOfRay = endOfRay - (Vector3.left* (extraRayWidth + gameObject.collider2D.bounds.size.y/2.0f));

		Debug.DrawLine( rstartOfRay, rendOfRay, Color.red );
		
		RaycastHit2D hitRight = Physics2D.Linecast( rstartOfRay, rendOfRay, 1 << LayerMask.NameToLayer( "Ground" ) );
		
		return hitRight;
	}
}