isNil forEach

[Clayman 20]

I have a bunch of groups, which might or might not have been created so far (depending on the path the player has chosen). At some point I want to delete all groups that have been created so far.

I've tried an isNil check for an array of all groupnames, which works well when all groups have been created. But if any of those groups has not been created, it throws up an undefined variable error.

Different variants I have tried, so far to no avail:

{if (!isNil _x) then {deleteGroup _x}} forEach  [grp1, grp2, grp3]; // Undefined Variable

{if (!isNil "_x") then {deleteGroup _x}} forEach  [grp1, grp2, grp3]; // Undefined Variable

{if (!isNil {_x}) then {deleteGroup _x}} forEach  [grp1, grp2, grp3]; // Undefined Variable

{if (!isNil str (_x)) then {deleteGroup _x}} forEach  [grp1, grp2, grp3]; // Undefined Variable

{if (!isNil _x) then {deleteGroup _x}} forEach  ["grp1", "grp2", "grp3"]; // deleteGroup: Type String, expected Group

Of course I could check each group individually, or add all created groups to an array and use this instead (which I'll probably do anyway).

But I'd like to understand why this variant does not work.

Anyone can enlighten me?^^

[killzone_kid 1326]

{
	deleteGroup (missionNamespace getVariable [_x, grpNull]);
} 
forEach  ["grp1", "grp2", "grp3"];

 

[Clayman 20]

That did the trick, thanks. Although I don't quite understand what I am doing here.

Is it all about different data types? getVariable using a string as argument, while missionNamespace returning the actual group?

[killzone_kid 1326]

the groups you name in editor are stored in missionNamespace variables with the same name