WoW API: GetPartyMember

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Returns 1 if the specified party member exists, nil otherwise.

memberExists = GetPartyMember(index);

Parameters

Arguments

index 

Number - Which party member to query (1-4).

Returns

memberExists

Flag - If the specified party member exists, returns 1, otherwise nil.

Example

memberCount = 0
for groupindex = 1,MAX_PARTY_MEMBERS do
 if (GetPartyMember(groupindex)) then
  memberCount = memberCount + 1
 end
end

Result

Will count the number of members in the party (not the best way to do that but it's a reasonable example).