---
title: isExtender
framework: swift
role: symbol
role_heading: Instance Property
path: swift/unicode/scalar/properties-swift.struct/isextender
---

# isExtender

A Boolean value indicating whether the scalar’s principal function is to extend the value or shape of a preceding alphabetic scalar.

## Declaration

```swift
var isExtender: Bool { get }
```

## Discussion

Discussion Typical extenders are length and iteration marks. This property corresponds to the “Extender” property in the Unicode Standard.