Paddle.cs

using UnityEngine;
using System.Collections;

public class Paddle : MonoBehaviour {
	public float paddleSpeed = 1.0f;

	private Vector3 playerPos = new Vector3 (0, -4.0f, 0);

	
	// Update is called once per frame
	void Update () {
	
		float xPos = transform.position.x + (Input.GetAxis ("Horizontal") * paddleSpeed);
		playerPos = new Vector3 (Mathf.Clamp (xPos, -5.0f, 5.0f), -4.0f, 0f);
		transform.position = playerPos;

	}
}