2D Movements problem

Hello guys i have little problem. In my game i have 3 lines and 1 Player . Line-1 is left , Line0 is starting Line and she is in middle of the screen, Line 1 is right.
I need that when I click on A, the Player moves from Line0 to Line-1 when I click on D so the player moves from Line-1 to Line0 and again clicks D to move from Line-0 to Line1.
I dont know how to script it. THX for every answer.
Here is Link https://ibb.co/fWLKSx

 

https://ibb.co/fWLKSx

 

You can try with array. Add this script to player. Drag&drop your lines from the scene into this script (fill the array with lines from left to right). Set the number for first line (beginn with 0).

Code (CSharp):

1. //array with lines positions
2.     public Transform [] Lines;
3.     //first line where player will be at start (beginns with 0)
4.     public int playerLine;
5.  
6.     void Start ()
7.     {
8.         //check that index isn't out of range (as example: your 3 lines will be indexed as 0, 1, 2)
9.         playerLine = Mathf.Clamp(playerLine, 0, Lines.Length - 1);
10.         //place player at needed line
11.         transform.position = new Vector2(Lines[playerLine].position.x, transform.position.y);
12.     }
13.  
14.     void Update ()
15.     {
16.         //check if D is pressed
17.         if (Input.GetKeyDown(KeyCode.D))
18.         {
19.             //increase the index at one
20.             playerLine = playerLine + 1;
21.             //check that new index can be out of range if greater as lenght of array -1
22.             if (playerLine >= Lines.Length)
23.                 //as said the index beginns with zero. The last line will have index: lenght of array - 1
24.                 playerLine = Lines.Length - 1;
25.             //move player at new line
26.             transform.position = new Vector2(Lines[playerLine].position.x, transform.position.y);
27.         }
28.  
29.         //check if A is pressed
30.         if (Input.GetKeyDown (KeyCode.A))
31.         {
32.             //decrease the index at one
33.             playerLine = playerLine - 1;
34.             //check that new index isn't lower as 0
35.             if (playerLine < 0)
36.                 //set index to zero
37.                 playerLine = 0;
38.             //move player at new line
39.             transform.position = new Vector2(Lines[playerLine].position.x, transform.position.y);
40.         }
41.     }

And then check the unity tutorials
https://unity3d.com/learn/tutorials

 

Oh my God bro you help so much <3 than you very much