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[docs] Add mention of "optional" to nullably types section (#613)

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Josh B
2024-08-07 12:18:50 -07:00
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docs/modules/language-reference/pages/index.adoc
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@@ -3721,6 +3721,7 @@ bird2: Bird? = null // <2>
The only class types that admit `null` values despite not ending in `?` are `Any` and `Null`. The only class types that admit `null` values despite not ending in `?` are `Any` and `Null`.
(`Null` is not very useful as a type because it _only_ admits `null` values.) (`Null` is not very useful as a type because it _only_ admits `null` values.)
`Any?` and `Null?` are equivalent to `Any` and `Null`, respectively. `Any?` and `Null?` are equivalent to `Any` and `Null`, respectively.
In some languages, nullable types are also known as _optional types_.
[[generic-types]] [[generic-types]]
==== Generic Types ==== Generic Types