Add async Collection extensions

Release Notes.md

@@ -12,6 +12,7 @@ This version also introduces a new `StoreKit` namespace with handy utils for man
 ### ✨ New features
 
 * `Bundle` has a new `displayName` extension.
+* `Collection` has new `asyncCompactMap` and `asyncMap` extensions.
 * `Date` has a new `components` extension for retrieving year, month, hour etc.
 * `String` has new `boolValue` extension.
 

Sources/SwiftKit/Concurrency/Collection+Async.swift

@@ -0,0 +1,53 @@
+//
+//  Collection+Async.swift
+//  SwiftKit
+//
+//  Created by Daniel Saidi on 2021-11-10.
+//  Copyright © 2021 Daniel Saidi. All rights reserved.
+//
+
+import Foundation
+
+@available(iOS 15.0, macOS 12.0, watchOS 8.0, tvOS 15.0, *)
+public extension Collection {
+    
+    /**
+     Compact map a collection using an async transform.
+     */
+    func asyncCompactMap<ResultType>(_ transform: (Element) async -> ResultType?) async -> [ResultType] {
+        await self
+            .asyncMap(transform)
+            .compactMap { $0 }
+    }
+    
+    /**
+     Compact map a collection using an async transform.
+     */
+    func asyncCompactMap<ResultType>(_ transform: (Element) async throws -> ResultType?) async throws -> [ResultType] {
+        try await self
+            .asyncMap(transform)
+            .compactMap { $0 }
+    }
+    
+    /**
+     Map a collection using an async transform.
+     */
+    func asyncMap<ResultType>(_ transform: (Element) async -> ResultType) async -> [ResultType] {
+        var result = [ResultType]()
+        for item in self {
+            await result.append(transform(item))
+        }
+        return result
+    }
+    
+    /**
+     Map a collection using an async transform.
+     */
+    func asyncMap<ResultType>(_ transform: (Element) async throws -> ResultType) async throws -> [ResultType] {
+        var result = [ResultType]()
+        for item in self {
+            try await result.append(transform(item))
+        }
+        return result
+    }
+}