---
title: Foundation Constants
framework: foundation
role: collectionGroup
role_heading: API Collection
path: foundation/foundation-constants
---

# Foundation Constants

This document defines constants in the Foundation framework that are not associated with a particular class.

## Topics

### Constants

- [averageKeyValueOperator](foundation/nskeyvalueoperator/averagekeyvalueoperator.md)
- [countKeyValueOperator](foundation/nskeyvalueoperator/countkeyvalueoperator.md)
- [distinctUnionOfArraysKeyValueOperator](foundation/nskeyvalueoperator/distinctunionofarrayskeyvalueoperator.md)
- [distinctUnionOfObjectsKeyValueOperator](foundation/nskeyvalueoperator/distinctunionofobjectskeyvalueoperator.md)
- [distinctUnionOfSetsKeyValueOperator](foundation/nskeyvalueoperator/distinctunionofsetskeyvalueoperator.md)
- [completeWhenUserInactive](foundation/fileprotectiontype/completewhenuserinactive.md)
- [inflectionConceptsKey](foundation/nsattributedstringformattingcontextkey/inflectionconceptskey.md)
- [maximumKeyValueOperator](foundation/nskeyvalueoperator/maximumkeyvalueoperator.md)
- [minimumKeyValueOperator](foundation/nskeyvalueoperator/minimumkeyvalueoperator.md)
- [NSOperationNotSupportedForKeyException](foundation/nsoperationnotsupportedforkeyexception.md)
- [duplicating](foundation/progress/fileoperationkind-swift.struct/duplicating.md)
- [sumKeyValueOperator](foundation/nskeyvalueoperator/sumkeyvalueoperator.md)
- [unionOfArraysKeyValueOperator](foundation/nskeyvalueoperator/unionofarrayskeyvalueoperator.md)
- [unionOfObjectsKeyValueOperator](foundation/nskeyvalueoperator/unionofobjectskeyvalueoperator.md)
- [unionOfSetsKeyValueOperator](foundation/nskeyvalueoperator/unionofsetskeyvalueoperator.md)
- [NSURLSessionUploadTaskResumeData](foundation/nsurlsessionuploadtaskresumedata.md)