WoW API: GetNumPartyMembers

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Returns number of party members.

numberOfPartyMembers = GetNumPartyMembers();

Parameters

numberOfPartyMembers: Integer - The number of party members - from 0 to 4 (excluding the player).

local n = GetNumPartyMembers();
if (n > 0) then 
 message("There are " .. n .. " other people in your party.");
end

Displays a message stating the number of people in the player's current party.