Question Can i press twice a keyboard for different options?

Im trying to create a basic pause menu, I can already open the pause menu with the esc keyboard, but i can't close it with the same button. my code is:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class EscapeToMenu : MonoBehaviour
6. {
7.     public GameObject menu;
8.  
9.     // Update is called once per frame
10.     void Update()
11.     {
12.         if (Input.GetKeyDown(KeyCode.Escape))
13.         {
14.             menu.SetActive(true);
15.         }
16.        
17.         if (menu.SetActive(true))
18.         {
19.             Input.GetKeyDown(KeyCode.Escape) = menu.SetActive(false);
20.         }
21.  
22.     }
23. }

I've tried with this code, but it dosent work becuase of two errors, one being Cs0029: connot implicitly convert type 'void' to 'bool' and the other one being a Cs0131: The left-handed side of an assignmet must be a variable, property or indexer.
Ive tried fixing this, but I couldn't find any solution.

 

Did you try with getkeyup just after getkeydown ?

 

Don't take this as bullying, but you need to learn the basics of programming.

1. What is the bool type (https://www.w3schools.com/cs/cs_booleans.php).
   
2. What is an if...else statement (https://www.w3schools.com/cs/cs_conditions.php).
   
3. What is the returned value of the function (https://www.w3schools.com/cs/cs_method_parameters_return.php).

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class EscapeToMenu : MonoBehaviour
6. {
7.     public GameObject menu;
8.  
9.     void Update()
10.     {
11.         if (Input.GetKeyDown(KeyCode.Escape))
12.         {
13.             menu.SetActive(!menu.activeSelf);
14.         }
15.     }
16. }

How the code works? If I pressed Esc then set the inverse of the current status. If the menu is active it becomes inactive, if it is inactive it becomes active.