Returns true if the two specified units are the same, false otherwise.

isSame = UnitIsUnit(unit1, unit2);

Parameters

Arguments

unit1 

UnitId - The first unit to query (e.g. "party1", "pet", "player")

unit2 

UnitId - The second unit to compare it to (e.g. "target")

Returns

isSame 

Boolean - 1 if the two units are the same entity, nil otherwise.

Example

if ( UnitIsUnit("targettarget", "player") ) then
 message("Look at me, I have aggro from " .. UnitName("target") .. "!");
end;

Result

Displays a message if your target is targetting you.