Fair value of asset given up

” If an asset is acquired in exchange for another asset (whether similar or dissimilar in nature), the cost will be measured at the fair value unless (a) the exchange transaction lacks commercial substance or (b) the fair value of neither the asset received nor the asset given up is reliably measurable. If the acquired item is not measured at fair value, its cost is measured at the carrying amount of the asset given up ”

i am company A.
case 1:
So for example company A have asset A and company B has asset B. There are exchanging their asset and Fair value of asset A is $10m and asset B $12m

” the cost will be measured at the fair value” – so it will be measured at $10m.

case 2:
Carrying amount of asset A is $6m(no FV) and fair value of asset B IS $12M – so it will be measured at $12m

case 3:
Carrying value of asset A is $6m and asset B is $8m (BOTH NO FV) – it will be measured at $6m.

am i right?

it might be basic question but I tend to forgotten few basic principles from F7. trying to do some catching up.