Download Foundations of F Sharp by Robert Pickering PDF

By Robert Pickering

Useful programming (FP) is the way forward for .NET programming, and F# is far greater than simply an FP language. each expert .NET programmer must know about FP, and theres no larger strategy to do it than via studying F#and no more straightforward technique to study F# than from Foundations of F#.
If youre already acquainted with FP, youll locate F# the language youve constantly dreamed of. And all .NET programmers will locate F# an exhilarating real-world substitute to C# and visible uncomplicated. This booklet is probably going to have many imitators, yet few real rivals. Written through F# evangelist Rob Pickering, and tech reviewed by way of F#s major clothier, Don Syme, this can be a sublime, finished advent to all features of the language and an incisive advisor to utilizing F# for real-world specialist improvement. F# is the way forward for programming (not simply on .NET), and the longer term is now.

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By Robert Pickering

Useful programming (FP) is the way forward for .NET programming, and F# is far greater than simply an FP language. each expert .NET programmer must know about FP, and theres no larger strategy to do it than via studying F#and no more straightforward technique to study F# than from Foundations of F#.
If youre already acquainted with FP, youll locate F# the language youve constantly dreamed of. And all .NET programmers will locate F# an exhilarating real-world substitute to C# and visible uncomplicated. This booklet is probably going to have many imitators, yet few real rivals. Written through F# evangelist Rob Pickering, and tech reviewed by way of F#s major clothier, Don Syme, this can be a sublime, finished advent to all features of the language and an incisive advisor to utilizing F# for real-world specialist improvement. F# is the way forward for programming (not simply on .NET), and the longer term is now.

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Object), as in the following code. I discuss types in F# in more detail in “Types and Type Inference” and “Defining Types” later in this chapter. 000000 "three" F# lists are immutable; in other words, once a list is created, it cannot be altered. The functions and operators that act on lists do not alter them, but they create a new, altered version of the list, leaving the old list available for later use if needed. The next example shows this. An F# list containing a single string is created, and then two more lists are created, each using the previous one as a base.

A field definition is composed of the field name followed by a colon and the field’s type. The type definition Organization1 is a record type where the field names are unique. qxp 4/27/07 12:59 PM Page 43 CHAPTER 3 ■ FUNCTIONAL PROGRAMMING is no need to mention the type name when it is created. To create a record, you place the field names followed by equals signs and the field values between braces ({}), as shown in the Rainbow identifier: #light type Organization1 = { boss : string ; lackeys : string list } let rainbow = { boss = "Jeffrey" ; lackeys = ["Zippy"; "George"; "Bungle"] } type Organization2 = { chief : string ; underlings : string list } type Organization3 = { chief : string ; indians : string list } let thePlayers = { new Organization2 with chief = "Peter Quince" and underlings = ["Francis Flute"; "Robin Starveling"; "Tom Snout"; "Snug"; "Nick Bottom"] } let wayneManor = { new Organization3 with chief = "Batman" and indians = ["Robin"; "Alfred"] } F# does not force field names to be unique, so sometimes the compiler cannot infer the type of a field from the field names alone.

To demonstrate, the next example shows a mathematical puzzle implemented as an F# function. Here you need to calculate lots of intermediate values that you don’t particularly care about; inventing names for each one these would be an unnecessary burden on the programmer. qxp 4/27/07 12:59 PM Page 23 CHAPTER 3 ■ FUNCTIONAL PROGRAMMING let x = x * 2 // Multiply by 2 let x = x - 40 // Subtract 40 let x = x * 50 // Multiply the result by 50 print_string "Enter last two digits of the year of your birth: " let input = read_int () let x = x + input let x = x - 10500 // Finally, subtract 10,500 printf "Date of birth (ddmmyy): %i" x mathsPuzzle() The results of this example, when compiled and executed, are as follows: Enter day of the month on which you were born: 23 Enter number of the month you were born: 5 Enter last two digits of the year of your birth: 78 Date of birth (ddmmyy): 230578 I should note that this is different from changing the value of an identifier.

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