Download Beginning F# 4.0 by Robert Pickering, Kit Eason PDF

By Robert Pickering, Kit Eason

This booklet is a brilliant beginning for exploring functional-first programming and its position in the way forward for software improvement. The best-selling advent to F#, now completely up-to-date to model 4.0, might help you study the language and discover its new features.

F# 4.0 is a mature, open resource, cross-platform, functional-first programming language which empowers clients and businesses to take on complicated computing issues of uncomplicated, maintainable and powerful code. F# is additionally an absolutely supported language in visible Studio and Xamarin Studio. different instruments helping F# improvement contain Emacs, MonoDevelop, Atom, visible Studio Code, elegant textual content, and Vim.

Beginning F#4.0 has been completely up to date that can assist you discover the hot positive factors of the language including:

    Type Providers

  • Constructors as first class functions
  • Simplified use of mutable values
  • Support for high-dimensional arrays
  • Slicing syntax aid for F# lists

Reviewed via Don Syme, the executive architect of F# at Microsoft examine, Beginning F#4.0 is a brilliant beginning for exploring useful programming and its position sooner or later of program development.

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Extra info for Beginning F# 4.0

Sample text

String A verbatim string where a backslash (\) is a regular character. String Like a verbatim string except you don’t have to use pairs of ” to represent double-quotes. Instead, the entire string is enclosed in triple double-quotes. Byte[] A string that will be stored as a byte array. Char A character. Boolean A Boolean. Int32 An integer as a hexadecimal. Int32 An integer as an octal. Int32 An integer as a binary. SByte A signed byte. Byte An unsigned byte. (continued) © Robert Pickering and Kit Eason 2016 R.

ToUpperInvariant() Here’s what happens when you send the function to F# Interactive and call it with a non-null and with a null string: val SafeUpperCase : s:string -> string > SafeUpperCase "Hello";; val it : string = "HELLO" > SafeUpperCase null;; val it : string = "" > Note that this is different from changing the value of an identifier. Because you’re redefining the identifier, you’re able to change the identifier’s type, as shown in the next example, but you still retain type safety. ■ Note Type safety, sometimes referred to as strong typing, basically means that F# will prevent you from performing an inappropriate operation on a value; for example, you can’t treat an integer as if it were a floating-point number.

Definition of Lucas numbers using pattern matching let rec luc x = match x with | x when x <= 0 -> failwith "value must be greater than 0" 33 CHAPTER 3 ■ FUNCTIONAL PROGRAMMING | 1 -> 1 | 2 -> 3 | x -> luc (x - 1) + luc (x - 2) // call printfn printfn printfn printfn the function and print the results "(luc 2) = %i" (luc 2) "(luc 6) = %i" (luc 6) "(luc 11) = %i" (luc 11) "(luc 12) = %i" (luc 12) This example, when executed, returns the following: (luc (luc (luc (luc 2) = 3 6) = 18 11) = 199 12) = 322 The syntax for pattern matching uses the keyword match, followed by the identifier that will be matched, then the keyword with, and then all the possible matching rules separated by vertical bars (|).

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