diff --git a/Rx.playground/Pages/Connectable_Observable_Operators.xcplaygroundpage/Contents.swift b/Rx.playground/Pages/Connectable_Observable_Operators.xcplaygroundpage/Contents.swift
index c366e4a2..d3ffdac5 100644
--- a/Rx.playground/Pages/Connectable_Observable_Operators.xcplaygroundpage/Contents.swift
+++ b/Rx.playground/Pages/Connectable_Observable_Operators.xcplaygroundpage/Contents.swift
@@ -12,7 +12,7 @@ Specialty Observables that have more precisely-controlled subscription dynamics.
 
 func sampleWithoutConnectableOperators() {
 
-    let int1 = interval(1, MainScheduler.sharedInstance)
+    let int1 = interval(1, scheduler: MainScheduler.sharedInstance)
 
     _ = int1
         .subscribe {
@@ -48,7 +48,7 @@ func sampleWithMulticast() {
             print("Subject \($0)")
         }
 
-    let int1 = interval(1, MainScheduler.sharedInstance)
+    let int1 = interval(1, scheduler: MainScheduler.sharedInstance)
         .multicast(subject1)
 
     _ = int1
@@ -91,7 +91,7 @@ publish = multicast + replay subject
 */
 func sampleWithReplayBuffer0() {
 
-    let int1 = interval(1, MainScheduler.sharedInstance)
+    let int1 = interval(1, scheduler: MainScheduler.sharedInstance)
         .replay(0)
 
     _ = int1
@@ -126,7 +126,7 @@ func sampleWithReplayBuffer2() {
 
     print("--- sampleWithReplayBuffer2 ---\n")
 
-    let int1 = interval(1, MainScheduler.sharedInstance)
+    let int1 = interval(1, scheduler: MainScheduler.sharedInstance)
         .replay(2)
 
     _ = int1
@@ -169,7 +169,7 @@ so publish is basically replay(0)
 */
 func sampleWithPublish() {
 
-    let int1 = interval(1, MainScheduler.sharedInstance)
+    let int1 = interval(1, scheduler: MainScheduler.sharedInstance)
         .publish()
 
     _ = int1
diff --git a/Rx.playground/Pages/Mathematical_and_Aggregate_Operators.xcplaygroundpage/Contents.swift b/Rx.playground/Pages/Mathematical_and_Aggregate_Operators.xcplaygroundpage/Contents.swift
index 8ee29c4c..e1ce0689 100644
--- a/Rx.playground/Pages/Mathematical_and_Aggregate_Operators.xcplaygroundpage/Contents.swift
+++ b/Rx.playground/Pages/Mathematical_and_Aggregate_Operators.xcplaygroundpage/Contents.swift
@@ -66,7 +66,7 @@ This function will perform a function on each element in the sequence until it i
 */
 example("reduce") {
     _ = sequenceOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
-        .reduce(0, +)
+        .reduce(0, accumulator: +)
         .subscribe {
             print($0)
         }