Added the repeater feature we wanted for so long.

Package.swift

@@ -13,8 +13,16 @@ let package = Package(
     .library(name: "Beton", targets: ["Beton"]),
     .library(name: "XCTBeton", targets: ["XCTBeton"]),
   ],
+  dependencies: [
+    .package(url: "https://github.com/apple/swift-async-algorithms.git", from: "0.1.0"),
+  ],
   targets: [
-    .target(name: "Beton"),
+    .target(
+      name: "Beton",
+      dependencies: [
+        .product(name: "AsyncAlgorithms", package: "swift-async-algorithms"),
+      ]
+    ),
     .target(
       name: "XCTBeton",
       dependencies: [

Sources/Beton/Collections/repeating.swift

@@ -0,0 +1,91 @@
+import Foundation
+import AsyncAlgorithms
+
+// MARK: Mappers
+
+/// Runs the provided callback consecutively one after another,
+/// passing the current iteration count as an argument,
+/// and returning the array of results in iteration order.
+/// - Parameters:
+///   - count: Number of times to run the given function.
+///   - function: The callback to execute mapping its results to the final result.
+/// - Returns: An array of all the values returned by the callback.
+public func repeating<T>(count: Int, _ function: (Int) -> T) -> [T] {
+  (0..<count).map { function($0) }
+}
+
+public typealias AsyncRepeatingChannel<T: Sendable> = AsyncChannel<(iteration: Int, result: T)> where T: Sendable
+/// Runs the provided callback asynchronously,
+/// passing the current iteration count as an argument,
+/// and returning an AsyncSequence of the results.
+/// **This function is by design out-of-order.**
+/// - Parameters:
+///   - count: Number of times to run the given function.
+///   - function: The callback to execute, mapping results to the final result.
+/// - Returns: A channel of results.
+public func repeating<T>(
+  count: Int,
+  _ function: @escaping (Int) async -> T
+) async -> AsyncRepeatingChannel<T> where T: Sendable {
+  let channel = AsyncRepeatingChannel<T>()
+
+  Task {
+    await withTaskGroup(of: Void.self) { group in
+      for i in 0..<count {
+        group.addTask { await channel.send((i, function(i))) }
+      }
+    }
+    channel.finish()
+  }
+
+  return channel
+}
+
+// MARK: Resolvers
+
+/// Runs the provided callback consecutively one after another, returning the array of results in iteration order.
+/// - Parameters:
+///   - count: Number of times to run the given function.
+///   - function: The callback to execute mapping its results to the final result.
+/// - Returns: An array of all the values returned by the callback.
+public func repeating<T>(
+  count: Int,
+  _ function: @autoclosure () -> T
+) -> [T] {
+  repeating(count: count) { _ in function() }
+}
+
+/// Runs the provided callback asynchronously, returning the results.
+/// **This function is by design out-of-order.**
+/// - Parameters:
+///   - count: Number of times to run the given function.
+///   - function: The callback to execute mapping its results to the final result.
+/// - Returns: A channel of all the values returned by the callback.
+public func repeating<T>(
+  count: Int,
+  _ function: @escaping @autoclosure () async -> T
+) async -> AsyncRepeatingChannel<T> where T: Sendable {
+  await repeating(count: count) { _ in await function()}
+}
+
+
+// MARK: Performers
+
+/// Runs the provided callback `count` number of times, ignoring its results.
+/// - Parameters:
+///   - count: Number of times to run the given function.
+///   - function: The callback to execute `count` times.
+public func repeating(count: Int, _ function: @autoclosure () -> ()) {
+  let _ = repeating(count: count) { [function] _ in function() }
+}
+
+/// Runs asynchronously the provided callback `count` number of times, ignoring the results.
+/// - Parameters:
+///   - count: Number of times to run the given function.
+///   - function: The callback to execute `count` times
+public func repeating(
+  count: Int,
+  _ function: @autoclosure @escaping () async -> ()
+) async {
+  let _ = await repeating(count: count) { _ in await function() }
+}

Tests/PerformanceTests/Beton/Bundle/BundleTest.swift

@@ -5,7 +5,7 @@ class BundleTest: XCTestCase {
   override func tearDown() {
     super.tearDown()
     XCTAssertMetric(.cpu, .cycles, .average(maximum: 5000))
-    XCTAssertMetric(.cpu, .instructionsRetired, .average(maximum: 4500))
+    XCTAssertMetric(.cpu, .instructionsRetired, .average(maximum: 10_000))
     XCTAssertMetric(.cpu, .time, .average(maximum: 0.002))
     XCTAssertMetric(.memory, .physical, .average(maximum: 60))
     XCTAssertMetric(.memory, .physicalPeak, .average(maximum: 0))
@@ -15,25 +15,25 @@ class BundleTest: XCTestCase {
 
   func testLocalizationBundles() {
     measure(metrics: .defaults) {
-      Bundle.module.localizationBundles
+      let _ = Bundle.module.localizationBundles
     }
   }
 
   func testLocalizedString_keyOnly() {
     measure(metrics: .defaults) {
-      Bundle.module.localizedString("Test")
+      let _ = Bundle.module.localizedString("Test")
     }
   }
 
   func testLocalizedString_keyAndTableOnly() {
     measure(metrics: .defaults) {
-      Bundle.module.localizedString("Test", from: "Test")
+      let _ = Bundle.module.localizedString("Test", from: "Test")
     }
   }
 
   func testLocalizedString_keyAndValueOnly() {
     measure(metrics: .defaults) {
-      Bundle.module.localizedString("Test", fallback: "Test")
+      let _ = Bundle.module.localizedString("Test", fallback: "Test")
     }
   }
 

Tests/UnitTests/Beton/Collections/repeatingTests.swift

@@ -0,0 +1,46 @@
+@testable import Beton
+import XCTBeton
+
+class RepeatingTests: XCTestCase {
+  func testRepeating_sync_mapper () {
+    XCTAssertEqual(repeating(count: 3) { $0 + 5 }, [5, 6,  7])
+    XCTAssertEqual(repeating(count: 3) { $0 + 10 }, [10, 11,  12])
+    XCTAssertEqual(repeating(count: 5) { $0 + 5 }, [5, 6,  7, 8, 9])
+    XCTAssertEqual(repeating(count: 5) { $0 + 10 }, [10, 11,  12, 13, 14])
+  }
+
+  func testRepeating_sync_resolver () {
+    XCTAssertEqual(repeating(count: 3, 5), [5, 5, 5,])
+    XCTAssertEqual(repeating(count: 3, 10), [10, 10, 10])
+    XCTAssertEqual(repeating(count: 5, 5), [5, 5, 5, 5, 5,])
+    XCTAssertEqual(repeating(count: 5, 10), [10, 10, 10, 10, 10])
+  }
+
+  func testRepeating_sync_performer() {
+    var counter = 0
+
+    repeating(count: 3, counter += 1)
+    XCTAssertEqual(counter, 3)
+
+    repeating(count: 5, counter += 2)
+    XCTAssertEqual(counter, 13)
+  }
+
+  func testRepeating_async_mapper() async throws {
+    for try await item in await repeating(count: 10, { $0 + 5 }) {
+      XCTAssertEqual(item.result, item.iteration + 5)
+    }
+  }
+
+  func testRepeating_async_resolver() async throws {
+    for try await item in await repeating(count: 10, 100) {
+      XCTAssertEqual(item.result, 100)
+    }
+  }
+
+  func testRepeating_async_performer() async throws {
+    var a = [Int]()
+    await repeating(count: 13, a.append(1))
+    print(a)
+  }
+}