Read e-book online Beginning F# PDF

By Robert Pickering, Kit Eason

ISBN-10: 1430223898

ISBN-13: 9781430223894

ISBN-10: 1430223901

ISBN-13: 9781430223900

Functional programming is likely to be the subsequent great wave in software improvement. As skilled builders be aware of, practical programming makes its mark by way of permitting software developers to improve options to advanced programming events cleanly and successfully. A wealthy background of sensible languages, together with Erlang and OCaml, leads easy methods to F#, Microsoft's attempt to convey the attractiveness and concentration of useful programming into the area of controlled code and .NET.

With Beginning F#, you have got a significant other that that can assist you discover F# and practical programming in a .NET setting. This publication is either a complete creation to all points of the language and an incisive consultant to utilizing F# for real-world expert development.

Reviewed by means of Don Syme, the executive architect of F# at Microsoft study, Beginning F# is a brilliant starting place for exploring useful programming and its function sooner or later of program development.

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Once an identifier at the top level has been assigned a value (or function), this value cannot be changed or redefined. An identifier is available only after its definition has ended, meaning that it is not usually possible to define an identifier in terms of itself. You will have noticed that in F#, you never need to explicitly return a value; the result of the computation is automatically bound to its associated identifier. So, how do you compute intermediate values within a function? In F#, this is controlled by whitespace.

The next example defines a function called squarePoints that creates a sequence of points forming a square grid, each point represented by a tuple of two integers. // sequence of tuples representing points let squarePoints n = seq { for x in 1 .. n do for y in 1 .. NET Framework BCL in Chapter 4. 42 CHAPTER 3 FUNCTIONAL PROGRAMMING Types and Type Inference F# is a strongly typed language, which means you cannot use a function with a value that is inappropriate. You cannot call a function that has a string as a parameter with an integer argument; you must explicitly convert between the two.

To ensure that recursive functions terminate, it is often useful to think of recursion in terms of a base case and a recursive case: 26 CHAPTER 3 FUNCTIONAL PROGRAMMING • The recursive case is the value for which the function is defined in terms of itself. For the function fib, this is any value other than 1 and 2. • The base case is the nonrecursive case; that is, there must be some value where the function is not defined in terms of itself. In the fib function, 1 and 2 are the base cases. Having a base case is not enough in itself to ensure termination.

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Beginning F# by Robert Pickering, Kit Eason


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