Stop Object From Moving After Key Release

Questions & Answers
1

I am using the following code to make an object move left/right. The object has a circle Collider 2D and a Rigidbody 2D attached to it. The Collider 2D has a Physics2D Material with Bounce = 0 and Friction = 0.

When use the arrow keys to move left/right and then let go of the keys, the object wants to keep moving left/right. I want it to stop as soon as I let go of the keys.

Sometimes when I move in another direction as soon as I let go of the keys it starts moving the other way.

What is causing this and how can I get it to stop when I let go of the directional keys?

using UnityEngine;
using System.Collections;

public class Move : MonoBehaviour {

    // Update is called once per frame
    void Update () {
        if(!renderer.isVisible){
            Debug.Log("Can't see me!");
        }
        this.transform.Translate(Input.GetAxis("Horizontal") * Time.deltaTime * 15,0,0);
    }
}
2

Input.GetAxis() does some averaging. You can use Input.GetAxisRaw() instead:

http://docs.unity3d.com/ScriptReference/Input.GetAxisRaw.html

3

void Update () {
if(!renderer.isVisible){
Debug.Log(“Can’t see me!”);
}
// change …!!!
if(input.getKeyDown … or any one of such funcs )
this.transform.Translate(Input.GetAxis(“Horizontal”) * Time.deltaTime * 15,0,0);
}