By Robert Pickering, Kit Eason
Microsoft is selling F# to complete language prestige and together with it within the regular visible Studio items and units of downloads from .NET 4.0 onwards as useful programming turns into a more and more vital a part of their method. We target, at the side of Don Syme’s professional consultant, to have the main entire and whole set of F# books on hand and starting F# is a cornerstone publication for these trying to find this sort of educational. starting F# is a special providing a result of author’s powerful connections with F# group and the truth that Pickering’s adventure of genuine international useful programming at LexiFi is much more than his competing authors.
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Extra resources for Beginning F#
A lambda is an anonymous function. Capturing Identifiers You have already seen that in F#, you can define functions within other functions. These functions can use any identifier in scope, including definitions that are also local to the function where they are defined. Because these inner functions are values, they could be returned as the result of the function or passed to another function as an argument. This means that although an identifier is defined within a function, so it is not visible to other functions, its actual lifetime may be much longer than the function in which it is defined.
The syntax for declaring values and functions in F# is indistinguishable because functions are values, and F# syntax treats them both similarly. For example, consider the following code: let n = 10 let add a b = a + b 18 CHAPTER 3 FUNCTIONAL PROGRAMMING let result = add n 4 printfn "result = %i" result On the first line, the value 10 is assigned to the identifier n; then on the second line, a function, add, which takes two arguments and adds them together, is defined. Notice how similar the syntax is, with the only difference being that a function has parameters that are listed after the function name.
The third and fourth lines show intermediate values being calculated. // function let halfWay let dif let mid mid + a to calculate a midpoint a b = = b - a = dif / 2 // call the function and print the results printfn "(halfWay 5 11) = %i" (halfWay 5 11) printfn "(halfWay 11 5) = %i" (halfWay 11 5) First, the difference between the two numbers is calculated, and this is assigned to the identifier dif using the let keyword. To show that this is an intermediate value within the function, it is indented by four spaces.