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Co-authored-by: Alexander McCord <11488393+alexmccord@users.noreply.github.com>
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vegorov-rbx 2021-06-08 21:56:20 +03:00 • committed by GitHub
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commit f02ba60bfa
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8
rfcs/syntax-nil-forgiving-operator.md
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@ -16,7 +16,7 @@ local p = a!.b!.c
```
instead of
```lua
local ((p as Part).b as Folder).c
local ((p :: Part).b :: Folder).c
```
Note that nil-forgiving operator is **not** a part of member access operator, it can be used in standalone expressions, indexing and other places:
@ -25,7 +25,7 @@ local p = f(a!)!
local q = b!['X']
```
Nil-forgiving operator (also known as null-forgiving or null-suppression operator) can be found in C# programming language.
Nil-forgiving operator (also known as null-forgiving or null-suppression operator) can be found in some programming languages such as C# and TypeScript.
## Design
@ -80,7 +80,7 @@ Because nil-chaining has a run-time check it can only be used in specific expres
Multiple cases will be defined:
* ?. nil-chaining member access operator. If LHS is `nil`, member access is not performed and the expression value is `nil`. The type of this expressions is a union between member type and `nil`.
* ?[] nil-chaining indexing operator. If LSH is `nil`, index access is not performed and the expression value is `nil`. Type of the expression is a union between element type and `nil`.
* ?() nil-chaining function call operator. If LSH is `nil`, function is not called and the expression value is `nil`. Type of the expression is a union between function return type and `nil`.
* ?[] nil-chaining indexing operator. If LHS is `nil`, index access is not performed and the expression value is `nil`. Type of the expression is a union between element type and `nil`.
* ?() nil-chaining function call operator. If LHS is `nil`, function is not called and the expression value is `nil`. Type of the expression is a union between function return type and `nil`.
nil-chaining operator can be found in many programming languages, including C#, Dart, Kotlin, Swift and TypeScript.