Completed Function

Promises/Promise.swift

@@ -361,3 +361,13 @@ public func first<V>(promises: [Promise<V>]) -> Promise<V> {
 public func first<V>(promises: Promise<V>...) -> Promise<V> {
     return first(promises)
 }
+
+public func completed<V>(promises: [Promise<V>]) -> Promise<Void> {
+    return promise { resolve, reject in
+        when(promises).then { _ in
+            resolve()
+        }.error { _ in
+            resolve()
+        }
+    }
+}

PromisesTests/PromisesTests.swift

@@ -145,4 +145,25 @@ class PromisesTests: XCTestCase {
 
         XCTAssert(p.isFulfilled == true)
     }
+
+    func testCompleted() {
+        let expectation = expectationWithDescription("promise completes")
+
+        var promises: [Promise<Int>] = []
+
+        let p = promise() { () -> Int in
+            throw PromisesTestsError.TestError
+        }
+        promises.append(p)
+
+        let p2 = fulfill(1)
+        promises.append(p2)
+
+        completed(promises).then { _ in
+            expectation.fulfill()
+        }
+
+        waitForExpectationsWithTimeout(3) { error in
+        }
+    }
 }