WoW API: IsAddOnLoaded

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Reference 

WoW API < IsAddOnLoaded

Determine if an AddOn has been loaded.

loaded = IsAddOnLoaded(index or "name")

Parameters[edit]

Arguments[edit]

(index or "name")
index
Integer - The index of the AddOn in the user's AddOn list. You cannot access Blizzard-provided AddOns through this mechanism.
name
String - The name of the AddOn to be queried. You can access Blizzard-provided AddOns through this mechanism.

Returns[edit]

loaded
Flag - Indicates if the AddOn has been loaded, 1 if it has been, nil if it has not.

Example[edit]

if (IsAddOnLoaded("AddonName")) then
  do stuff
end