# NSDecimalCompact(_:) Compacts the decimal structure for efficiency. ``` func NSDecimalCompact(_ number: UnsafeMutablePointer) ``` ## Discussion Formats number so that calculations using it will take up as little memory as possible. All the `NSDecimal...` arithmetic functions expect compact [`Decimal`](/documentation/Foundation/Decimal) arguments. For more information, see [Number and Value Programming Topics](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/NumbersandValues/NumbersandValues.html#//apple_ref/doc/uid/10000038i). --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)