2D Enemy patrol using javascript

I have a javascript code for enemy patrol that I translated from C#. I am not flagging any errors from it, but my enemy flips back and forward rapidly and does not patrol. basically using a linecast to detect the edge of a platform and flip once the edge is detected. any help would be awesome!

javascript code

 #pragma strict
 
 public var speed : float;
 public var enemyMask : LayerMask;
 private var myBody : Rigidbody2D;
 private var myTrans : Transform;
 private var myWidth : float;
 private var lineCastPos : Vector2;
 private var isGrounded : boolean;
 private var currRot : Vector3;
 
 
 function Start () {
     myTrans = this.transform;
     myBody = this.GetComponent(Rigidbody2D);
     myWidth = this.GetComponent(SpriteRenderer).bounds.extents.x;
 }
 
 function FixedUpdate () {
 
     var lineCastPos : Vector2 = myTrans.position - myTrans.right * myWidth;
     var isGrounded : boolean = Physics2D.Linecast (lineCastPos, lineCastPos + Vector2.down, enemyMask);
     if (!isGrounded) {
         currRot = myTrans.eulerAngles;
         currRot.y += 180;
         myTrans.eulerAngles = currRot;
         }
 
         var myVel : Vector2 = myBody.velocity;
         myVel.x = -myTrans.right.x * speed;
         myBody.velocity = myVel;
 }

c# code

 using UnityEngine;
 using System.Collections;
 
 public class Enemytest : MonoBehaviour {
     public float speed;
     public LayerMask enemyMask;
     Rigidbody2D myBody;
     Transform myTrans;
     float myWidth;
 
     // Use this for initialization
     void Start () {
         myTrans = this.transform;
         myBody = this.GetComponent<Rigidbody2D> ();
         myWidth = this.GetComponent<SpriteRenderer> ().bounds.extents.x;
 
     }
     
     // Update is called once per frame
     void FixedUpdate () {
 
         Vector2 lineCastPos = myTrans.position - myTrans.right * myWidth;
         bool isGrounded = Physics2D.Linecast (lineCastPos, lineCastPos + Vector2.down, enemyMask);
 
         if (!isGrounded) {
             Vector3 currRot = myTrans.eulerAngles;
             currRot.y += 180;
             myTrans.eulerAngles = currRot;
         }
 
         Vector2 myVel = myBody.velocity;
         myVel.x = -myTrans.right.x * speed;
         myBody.velocity = myVel;
     }
 }
 

the C# code works perfectly