By Michael R. Hansen, Hans Rischel
This finished advent to the rules of practical programming utilizing F# exhibits how you can practice easy theoretical ideas to provide succinct and chic courses. It demonstrates the position of practical programming in a large spectrum of functions together with databases and platforms. assurance additionally contains complex beneficial properties within the .NET library, the significant gains of F# and themes comparable to textual content processing, sequences, computation expressions and asynchronous computation. With a huge spectrum of examples and workouts, the booklet is ideal for classes in useful programming and for self-study. improving its use as a textual content is an accompanying site with downloadable courses, lecture slides, a mini-projects and hyperlinks to extra F# assets.
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Extra resources for Functional Programming Using F#
A prefix operator is declared using a leading tilde character. 0 1 This description of legal operators in F# is incomplete. The precise rules are complicated. 36 Values, operators, expressions and functions Remark: When defining an operator starting or ending in an asterisks “*” a space must be inserted after “(” or before “)” to avoid a conflict with the comment convention using “(*” and “*)”. 5 = 2e-3;; val it : bool = false "abc" <> "ab";; val it : bool = true It is not defined on functions (closures): cos = sin;; stdin(5,1): error FS0001: The type ’( ˆa -> ˆa) ...
Uncurry g is the function f where f (x, y) is the value h y for the function h = g x. Write declarations of curry and uncurry. 3 Tuples, records and tagged values Tuples, records and tagged values are compound values obtained by combining values of other types. Tuples are used in expressing “functions of several variables” where the argument is a tuple, and in expressing functions where the result is a tuple. The components in a record are identified by special identifiers called labels. Tagged values are used when we group together values of different kinds to form a single set of values.
Determine the type of f. For which arguments does the evaluation of f terminate? Write the evaluation steps for f(2,3). What is the mathematical meaning of f(x, y)? 10 Consider the following declaration: let test(c,e) = if c then e else 0;; 1. What is the type of test? 2. What is the result of evaluating test(false, fact(-1))? 3. 11 Declare a function VAT: int -> float -> float such that the value VAT n x is obtained by increasing x by n percent. Declare a function unVAT: int -> float -> float such that unVAT n (VAT n x) = x Hint: Use the conversion function float to convert an int value to a float value.