Convert a nullable type to its non-nullable type?

by

You need double exclamation mark like so:

val bar = makeNewBar(foo.name!!)

As documented in Null Safety section:

The third option is for NPE-lovers. We can write b!!, and this will
return a non-null value of b (e.g., a String in our example) or throw
an NPE if b is null:

val l = b!!.length

Thus, if you want an NPE, you can have it, but you have to ask for it explicitly, and it does not appear out of the
blue.

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