My error is slightly different ("expected 1 to equal +0"). Maybe i'm not framing my question correctly. Can you explain why assert.strictEqual(findUniq([0, 0, 1 ]), 0) should equal 0 and not 1? My code is returning 1 which I understand but how is this not correct?

NunoOliveira, could you elaborate on how the unique value is still expected to be zero even when there are multiple of those values?

Slightly trickier than the usual level 8. Hint: One line... Don't overthink.