those two code snippets are doing different things

Those 3 also can give 3diff results I think collections .filter { it.conditionA } .filter { it.conditionB } .filter { it.conditionC } collections .filter { it.conditionB } .filter { it.conditionA } .filter { it.conditionC } collections .filter { it.conditionC } .filter { it.conditionB } .filter { it.conditionA }

I don't think so 😛 Can you give an example where they do?

yes... probably my miss... I have tried to create this case but have failed

the "trick Q" refers to the point that it should use

&&

and not

||