diff --git a/bk1ch02p036defaultParameters/bk1ch02p036defaultParameters/ViewController.swift b/bk1ch02p036defaultParameters/bk1ch02p036defaultParameters/ViewController.swift
index 23e29d9a5..b1a047f11 100644
--- a/bk1ch02p036defaultParameters/bk1ch02p036defaultParameters/ViewController.swift
+++ b/bk1ch02p036defaultParameters/bk1ch02p036defaultParameters/ViewController.swift
@@ -18,6 +18,14 @@ func sayStrings(arrayOfStrings:String ...) {
     for s in arrayOfStrings { print(s) }
 }
 
+// new in beta 6, variadic can go anywhere
+
+func sayStrings(arrayOfStrings:String ..., times:Int) {
+    for _ in 1...times {
+        for s in arrayOfStrings { print(s) }
+    }
+}
+
 // ignored
 
 func say(s:String, times:Int, loudly _:Bool) {Dog().say(s, times:times)}
@@ -39,6 +47,15 @@ class ViewController: UIViewController {
         doThing(b:5, a:10) // legal but don't
 
         sayStrings("hey", "ho", "nonny nonny no")
+        
+        sayStrings("Mannie", "Moe", "Jack", times:3)
+        
+        // print is now variadic
+        
+        print("Mannie", 3, true) // Mannie 3 true
+        
+        print("Mannie", "Moe", separator:", ", terminator: ", ")
+        print("Jack")
 
         say("hi", times:3, loudly:true)
         
diff --git a/bk1ch04p187generics/bk1ch04p187generics/ViewController.swift b/bk1ch04p187generics/bk1ch04p187generics/ViewController.swift
index a73c30bc2..0b63a8f11 100644
--- a/bk1ch04p187generics/bk1ch04p187generics/ViewController.swift
+++ b/bk1ch04p187generics/bk1ch04p187generics/ViewController.swift
@@ -59,6 +59,8 @@ struct Insect3 : Flier3 {
 
 // workaround:
 
+///*
+
 protocol Superflier3 {}
 
 protocol Flier3 : Superflier3 {
@@ -72,6 +74,8 @@ struct Insect3 : Flier3 {
     func flockTogetherWith(f:Insect3) {}
 }
 
+//*/
+
 
 func flockTwoTogether2<T:Flier3>(f1:T, _ f2:T) {}
 let vd2 : Void = flockTwoTogether2(Bird3(), Bird3())
diff --git a/bk1ch04p194whereClauses2/bk1ch04p194whereClauses2/Base.lproj/LaunchScreen.storyboard b/bk1ch04p194whereClauses2/bk1ch04p194whereClauses2/Base.lproj/LaunchScreen.storyboard
index 18278dac2..5807d6eb2 100644
--- a/bk1ch04p194whereClauses2/bk1ch04p194whereClauses2/Base.lproj/LaunchScreen.storyboard
+++ b/bk1ch04p194whereClauses2/bk1ch04p194whereClauses2/Base.lproj/LaunchScreen.storyboard
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8152.3" systemVersion="14E46" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8187.4" systemVersion="14F27" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8124.4"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8151.3"/>
     </dependencies>
     <scenes>
         <!--View Controller-->
diff --git a/bk1ch04p196extensions/bk1ch04p196extensions/ViewController.swift b/bk1ch04p196extensions/bk1ch04p196extensions/ViewController.swift
index 7a7bd316c..d77d44428 100644
--- a/bk1ch04p196extensions/bk1ch04p196extensions/ViewController.swift
+++ b/bk1ch04p196extensions/bk1ch04p196extensions/ViewController.swift
@@ -4,7 +4,7 @@ import UIKit
 
 extension Array {
     mutating func shuffle () {
-        for i in stride(from:self.count-1, to:0, by:-1) {
+        for i in (0..<self.count).reverse() {
             let ix1 = i
             let ix2 = Int(arc4random_uniform(UInt32(i+1)))
             (self[ix1], self[ix2]) = (self[ix2], self[ix1])
diff --git a/bk1ch04p204arrays/bk1ch04p204collections/ViewController.swift b/bk1ch04p204arrays/bk1ch04p204collections/ViewController.swift
index 417410198..f1ebbfb73 100644
--- a/bk1ch04p204arrays/bk1ch04p204collections/ViewController.swift
+++ b/bk1ch04p204arrays/bk1ch04p204collections/ViewController.swift
@@ -124,6 +124,17 @@ class ViewController: UIViewController {
             let arr4 = arr.suffix(10) // [1,2,3] with no penalty
             print(arr4)
             
+            // new in beta 6
+            
+            do {
+                let arr2 = arr.suffixFrom(1)
+                print(arr2)
+                let arr3 = arr.prefixUpTo(1)
+                print(arr3)
+                let arr4 = arr.prefixThrough(1)
+                print(arr4)
+            }
+            
             // let arr5 = arr[0..<10]
             
             var r = arr.indices
@@ -199,9 +210,11 @@ class ViewController: UIViewController {
             print(arr)
             let i = arr.removeAtIndex(3)
             let ii = arr.removeLast()
+            let iii = arr.popLast()
             print(arr)
             _ = i
             _ = ii
+            _ = iii
             let arr2 = arr.dropFirst()
             let arr3 = arr.dropLast()
             _ = arr2
@@ -213,9 +226,11 @@ class ViewController: UIViewController {
             let arr2 = arr.joinWithSeparator([10,11]) // [1, 2, 10, 11, 3, 4, 10, 11, 5, 6]
             let arr3 = arr.joinWithSeparator([]) // [1, 2, 3, 4, 5, 6]
             let arr4 = arr.flatMap {$0} // new in Swift 1.2
+            let arr5 = Array(arr.flatten()) // new in Xcode 7 beta 6
             _ = arr2
             _ = arr3
             _ = arr4
+            _ = arr5
         }
         
         do {
@@ -244,8 +259,8 @@ class ViewController: UIViewController {
         let arr = [1,2,3]
         let arr2 = arr.map {$0 * 2} // [2,4,6]
         let arr3 = arr.map {Double($0)} // [1.0, 2.0, 3.0]
-        pepboys.map {print($0)} // prints Manny, then Moe, then Jack
-        pepboys.map(print)
+        pepboys.forEach {print($0)} // prints Manny, then Moe, then Jack
+        // pepboys.map(print) // no longer compiles
         let arr4 = pepboys.filter{$0.hasPrefix("M")} // [Manny, Moe]
 
         let arrr = [1, 4, 9, 13, 112]
diff --git a/bk1ch04p218dictionaries/bk1ch04p218dictionaries/ViewController.swift b/bk1ch04p218dictionaries/bk1ch04p218dictionaries/ViewController.swift
index 1391c29d9..92ee519f8 100644
--- a/bk1ch04p218dictionaries/bk1ch04p218dictionaries/ViewController.swift
+++ b/bk1ch04p218dictionaries/bk1ch04p218dictionaries/ViewController.swift
@@ -54,7 +54,7 @@ class ViewController: UIViewController {
                 print(s)
             }
             
-            let keys = d.keys.array
+            let keys = Array(d.keys)
             
             for (abbrev, state) in d {
                 print("\(abbrev) stands for \(state)")
diff --git a/bk1ch05p239loops/bk1ch05p239loops/ViewController.swift b/bk1ch05p239loops/bk1ch05p239loops/ViewController.swift
index d50f7cf2d..28a1c1f98 100644
--- a/bk1ch05p239loops/bk1ch05p239loops/ViewController.swift
+++ b/bk1ch05p239loops/bk1ch05p239loops/ViewController.swift
@@ -11,6 +11,7 @@ enum Error {
 class ViewController: UIViewController {
     
     var movenda = [1,2,3]
+    var movenda2 = [1,2,3]
     
     var boardView = UIView()
     
@@ -28,6 +29,12 @@ class ViewController: UIViewController {
             }
         }
         
+        do {
+            while let p = self.movenda2.popLast() {
+                print(p)
+            }
+        }
+        
         do {
             let tvc = UITableViewCell()
             let subview1 = UIView()
@@ -116,7 +123,7 @@ class ViewController: UIViewController {
         }
         
         do {
-            for i in stride(from: 10, through: 0, by: -2) {
+            for i in 10.stride(through: 0, by: -2) {
                 print(i) // 10, 8, 6, 4, 2, 0
             }
         }
diff --git a/bk1ch05p240error/bk1ch05p241error.xcodeproj/project.pbxproj b/bk1ch05p240error/bk1ch05p241error.xcodeproj/project.pbxproj
index 2af7d5387..0b5c391a3 100644
--- a/bk1ch05p240error/bk1ch05p241error.xcodeproj/project.pbxproj
+++ b/bk1ch05p240error/bk1ch05p241error.xcodeproj/project.pbxproj
@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		3269B3131B8D39B3009950F2 /* testing.txt in Resources */ = {isa = PBXBuildFile; fileRef = 3269B3121B8D39B3009950F2 /* testing.txt */; settings = {ASSET_TAGS = (); }; };
 		32F8A8B31B385DBA0042B53B /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 32F8A8B21B385DBA0042B53B /* AppDelegate.swift */; };
 		32F8A8B51B385DBA0042B53B /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 32F8A8B41B385DBA0042B53B /* ViewController.swift */; };
 		32F8A8B81B385DBA0042B53B /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 32F8A8B61B385DBA0042B53B /* Main.storyboard */; };
@@ -15,6 +16,7 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
+		3269B3121B8D39B3009950F2 /* testing.txt */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = testing.txt; sourceTree = "<group>"; };
 		32F8A8AF1B385DBA0042B53B /* bk1ch05p241error.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = bk1ch05p241error.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		32F8A8B21B385DBA0042B53B /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		32F8A8B41B385DBA0042B53B /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
@@ -56,6 +58,7 @@
 			children = (
 				32F8A8B21B385DBA0042B53B /* AppDelegate.swift */,
 				32F8A8B41B385DBA0042B53B /* ViewController.swift */,
+				3269B3121B8D39B3009950F2 /* testing.txt */,
 				32F8A8B61B385DBA0042B53B /* Main.storyboard */,
 				32F8A8B91B385DBA0042B53B /* Assets.xcassets */,
 				32F8A8BB1B385DBA0042B53B /* LaunchScreen.storyboard */,
@@ -124,6 +127,7 @@
 				32F8A8BD1B385DBA0042B53B /* LaunchScreen.storyboard in Resources */,
 				32F8A8BA1B385DBA0042B53B /* Assets.xcassets in Resources */,
 				32F8A8B81B385DBA0042B53B /* Main.storyboard in Resources */,
+				3269B3131B8D39B3009950F2 /* testing.txt in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -283,6 +287,7 @@
 				32F8A8C31B385DBA0042B53B /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
 	};
diff --git a/bk1ch05p240error/bk1ch05p241error/ViewController.swift b/bk1ch05p240error/bk1ch05p241error/ViewController.swift
index 9ce60e535..2012d7735 100644
--- a/bk1ch05p240error/bk1ch05p241error/ViewController.swift
+++ b/bk1ch05p240error/bk1ch05p241error/ViewController.swift
@@ -47,7 +47,27 @@ class ViewController: UIViewController {
             print(error)
         }
         
-        var err = SomeStruct()
+        // new better way in beta 6
+        
+        do {
+            let f = "nonexistent" // path to some file, maybe
+            if let s = try? String(contentsOfFile: f, encoding: NSUTF8StringEncoding) {
+                print(s) // won't happen
+            } else {
+                print("I guess there was no such file, eh?")
+            }
+        }
+        
+        lab: do {
+            // okay, I'm sick of failing, let's succeed for once :)
+            let f = NSBundle.mainBundle().pathForResource("testing", ofType: "txt")!
+            guard let s = try? String(contentsOfFile: f, encoding: NSUTF8StringEncoding)
+                else {print("still no file"); break lab}
+            print(s)
+            // if we get here, s is our string
+        }
+        
+        let err = SomeStruct()
         print(err._domain)
         print(err._code)
         
diff --git a/bk1ch05p240error/bk1ch05p241error/testing.txt b/bk1ch05p240error/bk1ch05p241error/testing.txt
new file mode 100644
index 000000000..793aa682b
--- /dev/null
+++ b/bk1ch05p240error/bk1ch05p241error/testing.txt
@@ -0,0 +1 @@
+This is a test
\ No newline at end of file
diff --git a/bk2ch08p467collectionViewLayoutFromScratchSwift/ch21p748collectionViewFlowLayout2/MyLayout.swift b/bk2ch08p467collectionViewLayoutFromScratchSwift/ch21p748collectionViewFlowLayout2/MyLayout.swift
index be30077e1..30109292b 100644
--- a/bk2ch08p467collectionViewLayoutFromScratchSwift/ch21p748collectionViewFlowLayout2/MyLayout.swift
+++ b/bk2ch08p467collectionViewLayoutFromScratchSwift/ch21p748collectionViewFlowLayout2/MyLayout.swift
@@ -69,6 +69,6 @@ class MyLayout : UICollectionViewLayout {
     
     override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
         //        println("rect")
-        return self.atts.values.array
+        return Array(self.atts.values)
     }
 }
\ No newline at end of file