<!--
{
  "availability" : [
    "iOS: 16.0.0 -",
    "iPadOS: 16.0.0 -",
    "macCatalyst: 16.0.0 -",
    "macOS: 13.0.0 -",
    "tvOS: 16.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 11.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Swift",
  "identifier" : "/documentation/Swift/LazySequence/mapFeatures(_:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Swift"
    ],
    "preciseIdentifier" : "s:s12LazySequenceV18CreateMLComponentsE11mapFeaturesys0a3MapB0VyxAC16AnnotatedFeatureVyqd_0_qd_1_GGqd_0_qd__cAHyqd__qd_1_G7ElementRtzr1_lF"
  },
  "title" : "mapFeatures(_:)"
}
-->

# mapFeatures(_:)

Returns a lazy sequence where the elements of the result are computed each time they
are read by calling transform function on the feature of an annotated feature.

```
func mapFeatures<Input, Output, Annotation>(_ transform: @escaping (Input) -> Output) -> LazyMapSequence<Base, AnnotatedFeature<Output, Annotation>> where Base.Element == AnnotatedFeature<Input, Annotation>
```

---

Copyright &copy; 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)