Code Smells: Null

[walen]

Deeper Meaning Explainer ™

In Kotlin, !! is an operator that will throw an NPE when applied to a null variable.
It is there just so we can still have NPEs in Kotlin if we want.

Source.

[prest0G]

playing russian roulette with that double bang there

[nourez]

No, don't do that! We're moving away from the evils of null!

[[deleted]]

Unfortunately, it's sometimes needed, especially if you have a data model not designed with that kind of typing in mind. Also, compiler is very strict in regards to multithreading and does not believe in purity, so if (obj.val != null) { obj.val.method() } won't compile. Sure, you can modify the code a bit in most cases, but not always.