Download Real World Functional Programming: With Examples in F# and by Jon Skeet, Tomas Petricek PDF

By Jon Skeet, Tomas Petricek

Functional programming languages like F#, Erlang, and Scala are attracting consciousness as a good option to deal with the hot necessities for programming multi-processor and high-availability purposes. Microsoft's new F# is a real sensible language and C# makes use of useful language positive aspects for LINQ and different fresh advances.

Real global sensible Programming is a distinct educational that explores the sensible programming version during the F# and C# languages. The truly offered rules and examples educate readers how useful programming differs from different methods. It explains how principles glance in F#-a useful language-as good as how they are often effectively used to resolve programming difficulties in C#. Readers construct on what they learn about .NET and study the place a practical technique makes the main feel and the way to use it successfully in these cases.

The reader must have an exceptional operating wisdom of C#. No previous publicity to F# or useful programming is required.

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Extra info for Real World Functional Programming: With Examples in F# and C#

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It gives you a terser way to think about the problem, so the number of elements that you'll have to keep in mind will be lower. In the first chapter, I said that the declarative style gives us a new way for extending the vocabulary we can use to specify a solution to a class of problems. This is usually best approached by using functions that take other functions as parameters. We'll talk about these in the next section. 2 Higher order functions We've seen that we can treat functions as values and also write functions that take other function as parameters.

There are several terms that are often used when talking about these kinds of functions. The first concept is treating a function as an ordinary value. This includes the fact that functions have a type (in C# this is a delegate type) and that you can use function as an argument to another function. Frankly, you can just use a function in any place where you can use for example an integer or a string including returning a function as ©Manning Publications Co. com> 39 a result or storing functions in a list.

2 demonstrates how we can use this mechanism to analyze how the SumNumbers function computes its result. The following listing is only pseudo-code displaying sequence of steps, so I'd like to use [CA] (or some other arrow character) here not as a line continuation, but as a continuation of the example. 2 Functional evaluation of an expression SumNumbers(5,5) [CA]Start with call "SumNumbers(5,5)" SumNumbers(5, 5) [CA]Expand SumNumbers(5,5) if (5 > 5) 0 else { int sumRest = SumNumbers(6, 5) in 5 + sumRest } [CA]Evaluate the condition, expand the "else" branch int sumRest = SumNumbers(6, 5) in 5 + sumRest [CA]Expand SumNumbers(6, 5) int sumRest = if (6 > 5) 0 else { int sumRest = SumNumbers(7, 5) in 1 + sumRest } in 5 + sumRest [CA]Evaluate the condition, expand the "then" branch int sumRest = 0 in 5 + sumRest [CA]Replace occurrences of "sumRest" with the actual value 5 + 0 [CA]Evaluate the expression 5 As you can see, this way of writing down the computation of some functional code is very easy and even though functional programmers don’t spend their lives by writing down how their program executes, it is very useful to get used to this kind of computations, because it gives us a very powerful way of thinking about functional code.

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