Use swift 2 guard statement

SocketIOClientSwift/WebSocket.swift

@@ -135,16 +135,20 @@ public class WebSocket : NSObject, NSStreamDelegate {
         }
 
         dispatch_async(queue, { [weak self] in
-            if let weakSelf = self {
+            guard let weakSelf = self else {
-                weakSelf.didDisconnect = false
+                return
             }
+
+            weakSelf.didDisconnect = false
         })
         dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0), { [weak self] in
-            if let weakSelf = self {
+            guard let weakSelf = self else {
+                return
+            }
+
             weakSelf.isCreated = true
             weakSelf.createHTTPRequest()
             weakSelf.isCreated = false
-            }
         })
     }
     
@@ -375,13 +379,15 @@ public class WebSocket : NSObject, NSStreamDelegate {
         if totalSize > 0 {
             if validateResponse(buffer, bufferLen: totalSize) {
                 dispatch_async(queue, { [weak self] in
-                    if let weakSelf = self {
+                    guard let weakSelf = self else {
+                        return
+                    }
+
                     weakSelf.connected = true
                     if let connectBlock = weakSelf.onConnect {
                         connectBlock()
                     }
                     weakSelf.delegate?.websocketDidConnect(weakSelf)
-                    }
                 })
                 totalSize += 1 //skip the last \n
                 let restSize = bufferLen - totalSize
@@ -520,12 +526,14 @@ public class WebSocket : NSObject, NSStreamDelegate {
             }
             if receivedOpcode == OpCode.Pong.rawValue {
                 dispatch_async(queue, { [weak self] in
-                    if let weakSelf = self {
+                    guard let weakSelf = self else {
+                        return
+                    }
+
                     if let pongBlock = weakSelf.onPong {
                         pongBlock()
                     }
                     weakSelf.pongDelegate?.websocketDidReceivePong(weakSelf)
-                    }
                 })
                 
                 let step = Int(offset+numericCast(len))
@@ -615,22 +623,26 @@ public class WebSocket : NSObject, NSStreamDelegate {
                     return false
                 }
                 dispatch_async(queue, { [weak self] in
-                    if let weakSelf = self {
+                    guard let weakSelf = self else {
+                        return
+                    }
+
                     if let textBlock = weakSelf.onText {
                         textBlock(str! as String)
                     }
                     weakSelf.delegate?.websocketDidReceiveMessage(weakSelf, text: str! as String)
-                    }
                 })
             } else if response.code == .BinaryFrame {
                 let data = response.buffer! //local copy so it is perverse for writing
                 dispatch_async(queue, { [weak self] in
-                    if let weakSelf = self {
+                    guard let weakSelf = self else {
+                        return
+                    }
+
                     if let dataBlock = weakSelf.onData {
                         dataBlock(data)
                     }
                     weakSelf.delegate?.websocketDidReceiveData(weakSelf, data: data)
-                    }
                 })
             }
             readStack.removeLast()
@@ -734,13 +746,15 @@ public class WebSocket : NSObject, NSStreamDelegate {
     private func doDisconnect(error: NSError?) {
         if !self.didDisconnect {
             dispatch_async(queue, { [weak self] in
-                if let weakSelf = self {
+                guard let weakSelf = self else {
+                    return
+                }
+
                 weakSelf.didDisconnect = true
                 if let disconnect = weakSelf.onDisconnect {
                     disconnect(error)
                 }
                 weakSelf.delegate?.websocketDidDisconnect(weakSelf, error: error)
-                }
             })
         }
     }