Calling Functions from Other Scripts

Question

Say I have three different gameObjevcts, each representing rock, paper or scissors. These objects all have a Player script attached to them. The Player script has two functions i want to use, MoveSelected(), MoveNotSeleccted(). When the function CPUMove() is called, I want the program to randomly choose one of the three moves. My question is, how do I call a either of the functions fro another script RPS_Game? I thought of using Invoke() somehow but after trying couple of things with it, I got no where. Can someone please help me out?

public class RPS_Game {
    public void CPUMove() {
        int rand = Random.Range(1, 3);

        if(rand == 1) {
          //call MoveSelected() for one of the three Player objects and 
            MoveNotSelected() for the other two
        }
        else if(rand == 2) {
          //call MoveSelected() for one of the three Player objects and 
            MoveNotSelected() for the other two
        }
        else if(rand == 3) {
          //call MoveSelected() for one of the three Player objects and 
            MoveNotSelected() for the other two
        }
    }
}

Answer 1

You can just store a public reference to each of the scripts you want, and wire them up in the inspector:

public Player rockMove;
public Player paperMove;
public Player scissorsMove;

Then your script can say

rockMove.MoveSelected();
paperMove.MoveNotSelected();
scissorsMove.MoveNotSelected();

Though how I'd do it would be more like this:

public class PlayerMove : MonoBehaviour {

     public enum MoveType : int {
         Rock,
         Paper,
         Scissors
     }

     // This gives us a dropdown in the inspector 
     // to select a move type on each object.
     public MoveType moveType;

     // No need for two methods for on and off,
     // just pass a boolean representing true = selected
     // false = unselected (similar to Unity's SetActive method)
     public void SetMoveSelected(bool selected) {
        // ...
     }
}

Then your script can get an array of PlayerMove components (or even search for them itself using FindObjectsOfType), and your CPUMove method can be very simple:

// Expose the array to populate or validate in the Inspector.
public PlayerMove[] moves;

public void CPUMove() {
    // Generate a random move 0, 1, or 2
    // (Random.Range on ints never selects the last item)
    // and cast it to a MoveType to get Rock, Paper, or Scissors.
    var selectedMoveType = (PlayerMove.MoveType)Random.Range(0, 3);

    // Iterate over the move objects and toggle them on/off
    // based on whether they match the randomly-selected move type.
    foreach(var move in playerMoves)
        move.SetMoveSelected(move.moveType == selectedMoveType);
}