Check if object is null

Unity Engine
1

I tried both

if(object)

and

if(object != null)

but if it doesn’t exist Unity always throws an exception, is it normal?

2

Second version is more correct, but it should not thow an exception.

3

object is a reserved keyword. so post your original code that we can have a closer look.
also there is some ambiguity between null for the unity managed objects (c++ side) and those in your code. look here for example: Components and GameObject evaluate == to null after destroyed, except w/ interfaces? - Unity Engine - Unity Discussions

4

Object was an example of course

if (secondaryWeaponExists.secondaryWeapon != null)
{
       if (Input.GetKeyDown(KeyCode.Alpha2) && !keyPressed)
       {
           StartCoroutine(waitForSwitch());
           weaponActive = !weaponActive;
       }
}
5

I assume secondaryWeaponExists does not exist. Therefore, secondaryWeaponExists.secondaryWeapon throws an error because you are trying to access something which is null.

6

Uhm what if secondaryWeapon is static?

7

As long as secondaryWeaponExists is an instance and that instance is null, you can not access any of its members.

If you are trying to check a static variable use the class name rather than the instance.

8

Thanks.

9

Just add one more check:

if (secondaryWeaponExists != null && secondaryWeaponExists.secondaryWeapon != null)
{
  ...
}
1 Like
10

Thanks!