Updated to Swift 4: 1009, 1010. 1011

Author: Bob Lee

course/swift-fundamentals/class-struct-difference.md

@@ -158,6 +158,4 @@ To learn more about cons of Object Oriented Programming, you may read the beginn
 ## Conclusion
 You've learned the distinction between`classes` and `structs` when it comes to creating objects. Instances with `classes` have references to the object while with`structs` store. As a result, `classes` are called reference types while `structs` and `enums`, are value types.
 
- At this point, you may find no incentive to learn the difference. You are right. For small apps, it doesn't matter. But, once you start implementing `closures` and `delegates`, and other reference related tasks,  you would soon discover a little more complexity which you will learn how to solve in Chapter 5. You will appreciate value types along with Protocol Oriented Programming soon.
-
- > **Note:** Learn Swift with Bob is available on [Udemy](https://udemy.com/learn-swift-with-bob/). If you wish to receive a discount link, you may sign up [here](https://goo.gl/RR4K27).
+At this point, you may find no incentive to learn the difference. You are right. For small apps, it doesn't matter. But, once you start implementing `closures` and `delegates`, and other reference related tasks,  you would soon discover a little more complexity which you will learn how to solve in Chapter 5. You will appreciate value types along with Protocol Oriented Programming soon.

course/swift-fundamentals/extension.md

@@ -100,13 +100,11 @@ As mentioned, `extension` allows developers to implement all kinds of features.
 
 
 ### Source Code
-[1010_extension.playground]https://www.dropbox.com/sh/dq1288vcb77fzk6/AADgJhq0idPwIFTOTbysAxW7a?dl=0)
+[1010_extension.playground](https://www.dropbox.com/sh/dq1288vcb77fzk6/AADgJhq0idPwIFTOTbysAxW7a?dl=0)
 
 ## Conclusion
 You've learned the meaning of `self`.  I use `extension` to modularize view controller to prevent MVC, a.k.a, Massive View Controller.
 
 In Chapter 4, you will learn the sheer power of `extension` along with `protocols` If you are interested in learning how to build apps with `Protocols` and best practices that I know of, you may join the VIP list for the upcoming course: [The UIKIt Fundamentals with Bob].
 
 [The UIKIt Fundamentals with Bob]: /ABOUT.md/#course
-
-> **Note:** Learn Swift with Bob is available on [Udemy](https://udemy.com/learn-swift-with-bob/). If you wish to receive a discount link, you may sign up [here](https://goo.gl/RR4K27).

course/swift-fundamentals/intro-operators.md

@@ -3,7 +3,6 @@
 ## Introduction
 Welcome to Lesson 11 of The Swift Fundamentals. In Lesson 9, You've tasted the power of Swift operators for replacing a traditional `else-if` statement with a tertiary operator. In this lesson, you will be able be recognize a number of operators and use them when appropriate.
 
-
 ## Problem
 Write less, produce more
 
@@ -103,8 +102,6 @@ The above states that if `age` contains `nil`, use `defaultAge` instead. Nice an
 [1011_operators.playground](https://www.dropbox.com/sh/pbsgi6bt9p35k9k/AADx8qk44wOpMC5hgmd2DYrna?dl=0)
 
 ## Conclusion
-You've only scratched the surface. In Chapter 8, you will learn how to create your own operators. I know you are excited. Stay consistent and you will get there, hopefully soon.
+You've only scratched the surface. In Chapter 10, you will learn how to create your own operators. I know you are excited. Stay consistent and you will get there, hopefully soon.
 
 In the next lesson, you will learn how to create fake names for types. Keep marching forward.
-
-> **Note:** Learn Swift with Bob is available on [Udemy](https://udemy.com/learn-swift-with-bob/). If you wish to receive a discount link, you may sign up [here](https://goo.gl/RR4K27).

course/swift-fundamentals/set-tuple.md

@@ -1,7 +1,7 @@
 # Set and Tuple
 
 ## Introduction
-Welcome to Lesson 9 of The Swift Fundamentals. There are two objects. The first is to learn how to group a list of items with `sets`. The second is to work with various types within a single variable/constant with `tuples`.
+Welcome to Lesson 9 of The Swift Fundamentals. There are two objectives. The first is to learn how to group a list of items with `sets`. The second is to work with various types within a single variable/constant with `tuples`.
 
 ## Problem
  1. I'd love to eliminate duplicated items: `sets`
@@ -146,7 +146,7 @@ let sortedArrayFromHighToLow = evenNumberSet.sorted { $0 > $1 }
 print(sortedArrayFromHighToLow) // [100, 98, 96, ...]
 ```
 
-In this course, you are not going to learn how `sorted()` is constructed. However, if you are interested in learning more about Functional Programming with MVVM, you can be on the mailing list for my [upcoming courses](/ABOUT.md#course).
+In this course, you are not going to learn how `sorted()` is constructed. However, if you are interested in learning more about Functional/Reactive Programming with RxSwift and MVVM, you can be on the mailing list for my [upcoming courses](/ABOUT.md#course).
 
 ###  Practical Usage of Set
  - Finding unique letters and unique visitors
@@ -155,7 +155,7 @@ In this course, you are not going to learn how `sorted()` is constructed. Howeve
 ## Introducing Tuples
 You may combine multiple types of value in a single `let` or `var`.
 
-```swif
+```swift
 let firstScore = (name: "Bob", score: 9)
 ```
 
@@ -231,6 +231,7 @@ for (index, value) in shoppingList.enumerated() {
 
 ### Reference
 [Swift API Design Guidelines](https://swift.org/documentation/api-design-guidelines/)
+
 ## Conclusion
 To recap, `Set` is used to group non-duplicate items with no order. `Tuple` is used to group all kinds of types with the order you define.  Second, you've learned how to identify mutating vs non-mutating methods based on the naming guide. Make sure you follow the same principle in your codebase as well. Don't get too caught up with Functional Programming. I know it sounds cool. You will get a taste of it in chapter 3, Intro to Functional Swift.
 

course/swift-fundamentals/typealias.md

@@ -7,6 +7,7 @@ Welcome to the last lesson of The Swift Fundamentals. You've come a long way. Yo
 The parameters are unreadable and boring
 
 > **Typealias:** A false or assumed identity. - [Oxford Dictionary]
+
 [Oxford Dictionary]: https://en.oxforddictionaries.com/definition/alias
 
 ### Typealias for String
@@ -58,12 +59,10 @@ var optionalOne: String?
 var optionalTwo: Optional<String> // Generic Enum
 ```
 
-> You will learn more about `Optionals` in Chapter 7.
+> You will learn more about `optionals` in Chapter 8: Advanced Enums.
 
 ### Source Code
 [1012_typealias.playground](https://www.dropbox.com/sh/14785va0a9oor2x/AADwfnJXD17kyB36ch0LA8A4a?dl=0)
 
 ## Conclusion
 That's it. You've learned how fake.
-
-> **Note:** Learn Swift with Bob is available on [Udemy](https://udemy.com/learn-swift-with-bob/). If you wish to receive a discount link, you may sign up [here](https://goo.gl/RR4K27).