Which line of code is a shorter, more idiomatic version of the displayed snippet? val len: Int = if (x != null) x.length else -1

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Question:Which line of code is a shorter, more idiomatic version of the displayed snippet? val len: Int = if (x != null) x.length else -1

1.Val len = x?.let{x.len} else {-1}

2.Val len = x!!.length ?: -1

3.Val len:Int = (x != null)? x.length : -1

4.Val len = x?.length ?: -1

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  1. Which line of code is a shorter, more idiomatic version of the displayed snippet? val len: Int = if (x != null) x.length else -1
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