Use if-case-let

Author: ikesyo

ReactiveTask/Task.swift

@@ -262,13 +262,10 @@ public enum TaskEvent<T>: TaskEventType {
 
 	/// The resulting value, if the event is `Success`.
 	public var value: T? {
-		switch self {
-		case .Launch, .StandardOutput, .StandardError:
-			return nil
-
-		case let .Success(value):
+		if case let .Success(value) = self {
 			return value
 		}
+		return nil
 	}
 
 	/// Maps over the value embedded in a `Success` event.

ReactiveTaskTests/TaskSpec.swift

@@ -35,12 +35,8 @@ class TaskSpec: QuickSpec {
 		it("should launch a task that writes to stdout") {
 			let result = launchTask(Task("/bin/echo", arguments: [ "foobar" ]))
 				.reduce(NSMutableData()) { aggregated, event in
-					switch event {
-					case let .StandardOutput(data):
+					if case let .StandardOutput(data) = event {
 						aggregated.appendData(data)
-
-					default:
-						break
 					}
 
 					return aggregated
@@ -56,12 +52,8 @@ class TaskSpec: QuickSpec {
 		it("should launch a task that writes to stderr") {
 			let result = launchTask(Task("/usr/bin/stat", arguments: [ "not-a-real-file" ]))
 				.reduce(NSMutableData()) { aggregated, event in
-					switch event {
-					case let .StandardError(data):
+					if case let .StandardError(data) = event {
 						aggregated.appendData(data)
-
-					default:
-						break
 					}
 
 					return aggregated