Init

Author: muukii

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/swift
+# Edit at https://www.toptal.com/developers/gitignore?templates=swift
+
+### Swift ###
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## User settings
+xcuserdata/
+
+## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9)
+*.xcscmblueprint
+*.xccheckout
+
+## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
+build/
+DerivedData/
+*.moved-aside
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+
+## Obj-C/Swift specific
+*.hmap
+
+## App packaging
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
+# Packages/
+# Package.pins
+# Package.resolved
+# *.xcodeproj
+# Xcode automatically generates this directory with a .xcworkspacedata file and xcuserdata
+# hence it is not needed unless you have added a package configuration file to your project
+# .swiftpm
+
+.build/
+
+# CocoaPods
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+# Pods/
+# Add this line if you want to avoid checking in source code from the Xcode workspace
+# *.xcworkspace
+
+# Carthage
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build/
+
+# Accio dependency management
+Dependencies/
+.accio/
+
+# fastlane
+# It is recommended to not store the screenshots in the git repo.
+# Instead, use fastlane to re-generate the screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots/**/*.png
+fastlane/test_output
+
+# Code Injection
+# After new code Injection tools there's a generated folder /iOSInjectionProject
+# https://github.com/johnno1962/injectionforxcode
+
+iOSInjectionProject/
+
+.DS_Store
+
+.swiftpm
+# End of https://www.toptal.com/developers/gitignore/api/swift

Package.swift

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+// swift-tools-version: 6.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+  name: "swiftui-indexed-for-each",
+  platforms: [.iOS(.v13), .macOS(.v10_15), .watchOS(.v6), .tvOS(.v13)],
+  products: [
+    // Products define the executables and libraries a package produces, making them visible to other packages.
+    .library(
+      name: "swiftui-indexed-for-each",
+      targets: ["swiftui-indexed-for-each"]),
+  ],
+  targets: [
+    // Targets are the basic building blocks of a package, defining a module or a test suite.
+    // Targets can depend on other targets in this package and products from dependencies.
+    .target(
+      name: "swiftui-indexed-for-each"),
+    
+  ]
+)

Sources/swiftui-indexed-for-each/swiftui_indexed_for_each.swift

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+import SwiftUI
+
+public struct IndexedForEach<Element, Content>: View where Content: View {
+  
+  let data: Array<Element>
+  
+  let content: (Array<Element>.Index, Element) -> Content
+  
+  public init(data: Array<Element>, @ViewBuilder content: @escaping (Array<Element>.Index, Element) -> Content) {
+    self.data = data
+    self.content = content
+  }
+  
+  public var body: some View {
+    ForEach(IndexedArray.init(base: data), id: \.0) { e in
+      content(e.0, e.1)
+    }
+  }
+  
+}
+
+struct IndexedArray<SourceElement>: RandomAccessCollection {
+  
+  typealias Iterator = IndexingIterator<Self>
+  
+  typealias Element = (Index, Array<SourceElement>.Element)
+  
+  typealias Index = Array<SourceElement>.Index
+  
+  typealias SubSequence = ArraySlice<Element>
+  
+  typealias Indices = Array<SourceElement>.Indices
+  
+  var base: [SourceElement]
+  
+  var indices: Array<SourceElement>.Indices { base.indices }
+  
+  var startIndex: Array<SourceElement>.Index { base.startIndex }
+  
+  var endIndex: Array<SourceElement>.Index { base.endIndex }
+  
+  init(base: consuming [SourceElement]) {
+    self.base = base
+  }
+  
+  func index(before i: Index) -> Index {
+    base.index(before: i)
+  }
+  
+  func index(after i: Index) -> Index {
+    base.index(after: i)
+  }
+  
+  subscript(bounds: Range<Index>) -> SubSequence {
+    
+    // TODO: This is not efficient
+    
+    var slice: [Element] = []
+    
+    for index in bounds {
+      slice.append((index, base[index]))
+    }
+    
+    return .init(slice)
+  }
+  
+  subscript(position: Index) -> Element {
+    return (position, base[position])
+  }
+  
+}
+
+#Preview {
+  VStack {
+    IndexedForEach(data: [1, 2, 3]) { index, element in
+      Text("\(index): \(element)")
+    }
+  }
+}