The below code is not good

fun process(stringList: List<String>?, removeString: String): Int? = stringList
?.filterNot { it == removeString }
?.map { it.length }

as it introduces a lots of unnecessary branches. Try create unit test for it, and see if you could easily achieve 100% branch coverage. You’ll understand what I meant. Optionally you could look at the decompile code, and see the longer code generated compare to using let to eliminate the extra ?.

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