/StylishFSharp.Corrigenda

Corrections for the Book "Stylish F#" by Kit Eason, Apress, 2018

Corrections and Proposed Additions for the Book "Stylish F#" by Kit Eason, Apress, 2018

https://www.apress.com/us/book/9781484239995

This repo contains corrections and potential additions for the book "Stylish F". If you see a typo or code mistake, or would like to suggest additional or revised content, please submit a PR here. Changes will be incorporated in the next edition when possible.

Corrections

Chatper 4, ppage 65

Is unfold really an example starting with nothing?

Chapter 4, page 93, Recommendations

Currently reads:

I want the average of largest three

Should read:

I want the average of the largest three

Chapter 5, page 100

Currently reads:

...keep updating it if it the...

Should read:

...keep updating it if the...

Chapter 6, page 142

"...as the real (government endorsed!) as one is..." -- delete the second "as".

Chapter 6, page 143, Listing 6-28

Some s is incorrectly indented.

Chapter 7, page 168

Worth pointing out that Fable.Remoting makes nice use of records as interfaces.

Make the point that using interfaces rather than records-as-functions is an example of motivational transparency.

Chapter 8, page 196, Listing 8-11

Currently reads:

// Requires the version of ConsolePrompt from Listing 8-4

Should read:

// Requires the version of ConsolePrompt from Listing 8-11

Chapter 8, Page 202, "Interfaces"

Need to amend this section to reflect the fact that you can have parameter names in interface definitions.

Chapter 9, Page 241, Listing 9-14

The typographic quotes in the listing have incorrectly been replaced with neutral quotes.

Chapter 10, Page 267

Change "highly questionable, main wiring" to "highly questionable mains wiring".

Chapter 13, Page 359

Remove paragraph saying that it would now be a good time to rurun the code.

Additions

Chapter 3 - Missing Data

  • Add new section on Option.orElse.

Chapter 4 - Working Effectively with Collection Functions

  • Add a cross reference between LINQ naming and F# name - e.g. SelectMany -> collect

Chapter 6 - Pattern Matching

  • Add something about the KeyValuePair active pattern, especially when working with dictionaries/maps.

Chapter 10 - Asynchronous and Parallel Programming

Type Providers

Consider adding a section on type providers.

  • SQL
  • CSV
  • CSV versus CSVFile
  • Sampling issues
  • JSON

F# 4.6

Anonymous Record Types
  • Add new section to Chapter 7 to cover anonymous record types:

-- Instantiation

-- Consumption

-- Performance

-- Structs

-- Serialization

-- LINQ

  • Amend existing commentary on long tuples in pipelines to include the possibility of using anonymous record types.

See this for style comments: https://blogs.msdn.microsoft.com/dotnet/2019/01/24/announcing-f-4-6-preview/

ValueOption extensions

Delete/amend the para beginning At the time of writing... on p.55.

tryExactlyOne

Consider adding to Chapter 4.