Q253
Which line of code is a shorter, more idiomatic version of the displayed snippet? val len: Int = if (x != null) x.length else -1
A.
val len = x?.let{x.len} else {-1}
B.
val len = x!!.length ?: -1
C.
val len:Int = (x != null)? x.length : -1
D.
val len = x?.length ?: -1
AnswerAnswer: Option D
Solution
Answer: Option D
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