Add sum convenience methods

.circleci/config.yml

@@ -4,7 +4,7 @@ codecov:
 jobs:
   build-and-test:
     macos:
-      xcode: 11.6.0
+      xcode: 12.1.0
     shell: /bin/bash --login -o pipefail
     steps:
       - checkout
@@ -25,7 +25,7 @@ jobs:
           destination: scan-logs
   danger:
     macos:
-      xcode: 11.6.0
+      xcode: 12.1.0
     working_directory: /Users/distiller/project
     environment:
       DANGER_GITHUB_API_TOKEN: 2b388130450c1a4247582e419e761bfd301f984d

Example/Podfile.lock

@@ -1,8 +1,8 @@
 PODS:
   - SwiftLint (0.34.0)
-  - TiltUp (2.2.1)
-  - TiltUpTest (2.2.1):
-    - TiltUp
+  - TiltUp (2.3.0)
+  - TiltUpTest (2.3.0):
+    - TiltUp (= 2.3.0)
 
 DEPENDENCIES:
   - SwiftLint
@@ -21,8 +21,8 @@ EXTERNAL SOURCES:
 
 SPEC CHECKSUMS:
   SwiftLint: 79d48a17c6565dc286c37efb8322c7b450f95c67
-  TiltUp: 90d18b6807251d4899fed49d0f7b35c8261c9c8c
-  TiltUpTest: dde6107f0ca56be4f882fff79f73c8db3047b603
+  TiltUp: 06097dcaa1a2618724debe245b947138b8e2e71c
+  TiltUpTest: 0298b8f38ba6bc88948a3e7d54a22dc1d53a5556
 
 PODFILE CHECKSUM: 59178fc1d37e1d262a19f2432a54024fd9ed50de
 

Example/Tests/Extensions/Sequence+sumTests.swift

@@ -0,0 +1,28 @@
+//
+//  Sequence+sumTests.swift
+//  TiltUp_Tests
+//
+//  Created by Erik Strottmann on 12/15/20.
+//  Copyright © 2020 Clutter. All rights reserved.
+//
+
+import XCTest
+
+import TiltUp
+
+final class SequenceSumTests: XCTestCase {
+    func testSum() {
+        let numbers = [1, -2, 3, -4]
+        XCTAssertEqual(numbers.sum(), -2)
+    }
+
+    func testSumWithTransformClosure() {
+        let numbers = [1.1, 3.3, 5.5, 7.7, 9.9]
+        XCTAssertEqual(numbers.sum { $0.rounded() }, 28.0, accuracy: 0.001)
+    }
+
+    func testSumWithTransformKeyPath() {
+        let strings = ["aleph", "omega", "double-yoo"]
+        XCTAssertEqual(strings.sum(\.count.description.count), 4)
+    }
+}

Example/TiltUp.xcodeproj/project.pbxproj

@@ -20,6 +20,7 @@
 		607FACD61AFB9204008FA782 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 607FACD51AFB9204008FA782 /* AppDelegate.swift */; };
 		780DE4A324205FCB00AD18DD /* PhotoCaptureTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 780DE4A224205FCB00AD18DD /* PhotoCaptureTests.swift */; };
 		781B6E9E23B143CD000EA68B /* CameraCoordinator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 781B6E9D23B143CD000EA68B /* CameraCoordinator.swift */; };
+		BB1598792589677100DE7F2C /* Sequence+sumTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = BB1598782589677100DE7F2C /* Sequence+sumTests.swift */; };
 		BBD511DD2320206D00EB8673 /* UnexpectedNilErrorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = BBD511DC2320206D00EB8673 /* UnexpectedNilErrorTests.swift */; };
 		BBD58F3723593DF500FDD6FE /* SingleSelectionViewModelTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = BBD58F3623593DF500FDD6FE /* SingleSelectionViewModelTests.swift */; };
 		BBD58F392359487700FDD6FE /* SingleSelectionViewModelInternalTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = BBD58F382359487700FDD6FE /* SingleSelectionViewModelInternalTests.swift */; };
@@ -62,6 +63,7 @@
 		780DE4A224205FCB00AD18DD /* PhotoCaptureTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PhotoCaptureTests.swift; sourceTree = "<group>"; };
 		781B6E9D23B143CD000EA68B /* CameraCoordinator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CameraCoordinator.swift; sourceTree = "<group>"; };
 		8DF9D5246472A46303CD5C66 /* Pods-TiltUp_Example.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-TiltUp_Example.release.xcconfig"; path = "Target Support Files/Pods-TiltUp_Example/Pods-TiltUp_Example.release.xcconfig"; sourceTree = "<group>"; };
+		BB1598782589677100DE7F2C /* Sequence+sumTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Sequence+sumTests.swift"; sourceTree = "<group>"; };
 		BBD511DC2320206D00EB8673 /* UnexpectedNilErrorTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UnexpectedNilErrorTests.swift; sourceTree = "<group>"; };
 		BBD58F3623593DF500FDD6FE /* SingleSelectionViewModelTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SingleSelectionViewModelTests.swift; sourceTree = "<group>"; };
 		BBD58F382359487700FDD6FE /* SingleSelectionViewModelInternalTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SingleSelectionViewModelInternalTests.swift; sourceTree = "<group>"; };
@@ -191,9 +193,10 @@
 		607FACE81AFB9204008FA782 /* Tests */ = {
 			isa = PBXGroup;
 			children = (
-				BBD58F3A23594A5300FDD6FE /* Screens */,
 				0B25C66F2304C2B200F88096 /* Architecture */,
 				BBD511DB2320205900EB8673 /* Errors */,
+				BB1598772589674A00DE7F2C /* Extensions */,
+				BBD58F3A23594A5300FDD6FE /* Screens */,
 				607FACE91AFB9204008FA782 /* Supporting Files */,
 			);
 			path = Tests;
@@ -241,6 +244,14 @@
 			name = Frameworks;
 			sourceTree = "<group>";
 		};
+		BB1598772589674A00DE7F2C /* Extensions */ = {
+			isa = PBXGroup;
+			children = (
+				BB1598782589677100DE7F2C /* Sequence+sumTests.swift */,
+			);
+			path = Extensions;
+			sourceTree = "<group>";
+		};
 		BBD511DB2320205900EB8673 /* Errors */ = {
 			isa = PBXGroup;
 			children = (
@@ -498,6 +509,7 @@
 				BBD511DD2320206D00EB8673 /* UnexpectedNilErrorTests.swift in Sources */,
 				780DE4A324205FCB00AD18DD /* PhotoCaptureTests.swift in Sources */,
 				0B25C6792304C2B300F88096 /* TestAppCoordinator.swift in Sources */,
+				BB1598792589677100DE7F2C /* Sequence+sumTests.swift in Sources */,
 				BBD58F392359487700FDD6FE /* SingleSelectionViewModelInternalTests.swift in Sources */,
 				0B25C6782304C2B300F88096 /* TestNavigationController.swift in Sources */,
 			);

TiltUp.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'TiltUp'
-  s.version          = '2.2.1'
+  s.version          = '2.3.0'
   s.summary          = 'Official Clutter SDK in Swift to access core iOS features.'
 
 # This description is used to generate tags and improve search results.

TiltUp/Classes/Extensions/Sequence+sum.swift

@@ -0,0 +1,32 @@
+//
+//  Sequence+sum.swift
+//  TiltUp
+//
+//  Created by Erik Strottmann on 12/15/20.
+//
+
+extension Sequence {
+     /// Applies the given closure to each element of the sequence, adds the
+     /// transformed elements together, and returns the result.
+     ///
+     /// - Parameter transform: A closure that accepts an element of this
+     ///   sequence and returns a value of an `AdditiveArithmetic` type, to be
+     ///   added together with the other transformed elements.
+     /// - Returns: The final summed value. If the sequence is empty, the result
+     ///   is `.zero`.
+     public func sum<Result>(
+         _ transform: (Element) throws -> Result
+     ) rethrows -> Result where Result: AdditiveArithmetic {
+         return try map(transform).reduce(.zero, +)
+     }
+}
+
+extension Sequence where Element: AdditiveArithmetic {
+     /// Adds the sequence’s elements together and returns the result.
+     ///
+     /// - Returns: The final summed value. If the sequence is empty, the result
+     ///   is `.zero`.
+     public func sum() -> Element {
+         return sum { $0 }
+     }
+ }

TiltUpTest.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'TiltUpTest'
-  s.version          = '2.2.1'
+  s.version          = '2.3.0'
   s.summary          = 'Official Clutter SDK in Swift to access core iOS test helpers.'
 
 # This description is used to generate tags and improve search results.
@@ -31,7 +31,7 @@ TODO: Add long description of the pod here.
   s.pod_target_xcconfig = { 'ENABLE_BITCODE' => 'NO' }
 
   s.frameworks = 'XCTest'
-  s.dependency 'TiltUp'
+  s.dependency 'TiltUp', "= #{s.version}"
 
   s.source       = { :git => "git@github.com:clutter/TiltUp.git", :tag => "#{s.version}" }