# GenerationGuide Guides that control how values are generated. ``` struct GenerationGuide ``` ## Topics ### Getting the pattern [`static func pattern

(Regex

) -> GenerationGuide`](/documentation/FoundationModels/GenerationGuide/pattern(_:)) Enforces that the string follows the pattern. ### Getting the element [`static func element(GenerationGuide) -> GenerationGuide<[Element]>`](/documentation/FoundationModels/GenerationGuide/element(_:)) Enforces a guide on the elements within the array. ### Getting the count [`static count(_:)`](/documentation/FoundationModels/GenerationGuide/count(_:)) Enforces that the array has exactly a certain number of elements. ### Getting the constant [`static func constant(String) -> GenerationGuide`](/documentation/FoundationModels/GenerationGuide/constant(_:)) Enforces that the string be precisely the given value. [`static func anyOf([String]) -> GenerationGuide`](/documentation/FoundationModels/GenerationGuide/anyOf(_:)) Enforces that the string be one of the provided values. ### Getting a range [`static range(_:)`](/documentation/FoundationModels/GenerationGuide/range(_:)) Enforces values that fall within a range. ### Getting the minimum value [`static minimum(_:)`](/documentation/FoundationModels/GenerationGuide/minimum(_:)) Enforces a minimum value. [`static func minimumCount(Int) -> GenerationGuide<[Element]>`](/documentation/FoundationModels/GenerationGuide/minimumCount(_:)) Enforces a minimum number of elements in the array. ### Getting the maximum value [`static maximum(_:)`](/documentation/FoundationModels/GenerationGuide/maximum(_:)) Enforces a maximum value. [`static func maximumCount(Int) -> GenerationGuide<[Element]>`](/documentation/FoundationModels/GenerationGuide/maximumCount(_:)) Enforces a maximum number of elements in the array. --- 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)