I made a diff of the versions of Swift ebooks between the early June and early July versions. I'm not sure if I can post it publicly, but here's a summary of what's updated:

swift_programming_language_b3.md

• across all sections:

  • changed all occurrences of the a..b operator to a..<b
  • changed all occurrences of a Something[] array type to [Something]
  • changed some occurrences of an Array(values) array initialization to [Something](values)
  • changed some occurrences of a Dictionary<Key, Value> dictionary type to [Key: Value]

• Swift Tour:

  • added a line:

    On a Mac, visit this link: https://developer.apple.com/library/ios/swift_tour.

• Collection Types:

  • removed info about the different behavior of Array from "Mutability of Collections" and moved the section to the beginning
  • "Dictionaries": added sections "Dictionary Type Shorthand Syntax" and "Hash Values for Dictionary Key Types"

• Closures: renamed sort function to sorted

• Enumerations: in the barcode example, "identifier" part was split into "manufacturer code" and "product code" parts

• Classes and Structures, "Assignment and Copy Behavior for Collection Types":

  • renamed to "Assignment and Copy Behavior for Strings, Arrays, and Dictionaries"

  • removed the paragraph:

    However, arrays have slightly different copying behavior from dictionaries and other structures when they are assigned to a constant or variable, and when they are passed to a function or method.

  • removed the sections:

    • "Assignment and Copy Behavior for Dictionaries"
    • "Assignment and Copy Behavior for Arrays"
    • "Ensuring That an Array Is Unique"
    • "Checking Whether Two Arrays Share the Same Elements"
    • "Forcing a Copy of an Array"

• Initialization, "Memberwise Initializers for Structure Types":

  • changed default structure initializer behavior from:

    In addition to the default initializers mentioned above, structure types automatically receive a memberwise initializer if they provide default values for all of their stored properties and do not define any of their own custom initializers.

  • to:

    Structure types automatically receive a memberwise initializer if they do not define any of their own custom initializers. This is true even if the structure’s stored properties do not have default values.

• Automatic Reference Counting: changed CreditCard number field type to UInt64 and added an explanation below

• Generics: added a section "Extending a Generic Type"

• Types

  • "Array Type": the three-dimensional array is now declared as [[[Int]]] instead of Int[][][]

  • added section "Dictionary Type"

  • "Optional Type": removed the part:

    When declaring an optional type, be sure to use parentheses to properly scope the ? operator. As an example, to declare an optional array of integers, write the type annotation as (Int[])?; writing Int[]? produces an error.

• Attributes: removed exported entry

using_swift_with_cocoa_b3.md

• across all sections: updated occurrences of Array to the new syntax

• Adopting Cocoa Design Patterns: added "Lazy Initialization" and "Key-Value Observing" section placeholders

• Working with Cocoa Data Types:

  • "Arrays": added the line below and a matching code sample:

    Alternatively, you can place a downcast after the array you are iterating over—both of these styles are equivalent.

  • added a section "Dictionaries"

• Writing Swift Classes with Objective-C Behavior:

  • "Implementing Core Data Managed Object Subclasses": added a second paragraph about namespacing and a screenshot

xtras.md

Script for "normalizing" the ebooks to remove the noise from the diff:

#!/usr/bin/env ruby

dir = ARGV.first or raise "Pass a directory path as argument"

Dir.glob("#{dir}/**/*.*html").each do |file|
  contents = File.read(file)
  contents.gsub!(%r("//apple_ref[^"]+"), '""')
  contents.gsub!(%r("TP\d+[^"]+"), '""')
  contents.gsub!(%r(#TP[^"]+"), '#"')
  contents.gsub!(%r(<dt class="term">), %(\n<dt class="term">))
  contents.gsub!(%r(<p class="para">), %(\n<p class="para">))
  File.write(file, contents)
end

How to use:

./normalize_ebook.rb v1.epub
./normalize_ebook.rb v2.epub
diff -ur v1.epub v2.epub > swift-beta3.diff