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The name String references the F# module Microsoft.FSharp.Core.String in the F# library. This contains a set of simple operations associated with values of the string type. It is common for types to have a separate module that contains associated operations. All modules under the Microsoft.FSharp namespaces Core, Collections, Text, and Control can be referenced by simple one-word prefixes, such as String.split and open String. Other modules under these namespaces include List, Option, and Array. Since String is a standard .NET type, you can also use functions provided by the .NET Framework runtime located under System.String and other important namespaces such as System.Text. RegularExpresions. Throughout this book, we use both the .NET Framework library and the F# additions extensively. We give an overview of the most commonly used .NET and F# libraries in 10.
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Using Data Structures
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The next portion of the code is as follows: let wordCount text = let words = String.split [' '] text let wordSet = Set.of_list words This gives you your first taste of using data structures from F# code, and the last of these lines lies at the heart of the computation performed by wordCount. It uses the function Set.of_list from the F# library to convert the given words to a concrete data structure that is, in effect, much like the mathematical notion of a set, though internally it is implemented using a data structure based on trees. You can see the results of converting data to a set by using F# Interactive:
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CHAPTER 2 GETTING STARTED WITH F# AND .N ET
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> Set.of_list ["b";"a";"b";"b";"c" ];; val it : Set<string> = set [ "a"; "b"; "c" ] > Set.to_list (Set.of_list ["abc"; "ABC"]);; val it : string list = [ "ABC"; "abc" ] Here you can see several things: F# Interactive prints the contents of structured values such as lists and sets. Duplicate elements are removed by the conversion. The elements in the set are ordered. The default ordering on strings used by sets is case sensitive.
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The next two lines of the wordCount function compute the result we re after the number of duplicate words. This is done by using two properties, Length and Count, of the values you ve computed: let nWords = words.Length let nDups = words.Length - wordSet.Count F# performs resolution on property names at compile time (or interactively when using F# Interactive, where there is no distinction between compile time and run time). This is done using compile-time knowledge of the type of the expression on the left of the dot in this case, words and wordSet. Sometimes a type annotation is required in your code in order to resolve the potential ambiguity among possible property names. For example, the following code uses a type annotation to note that inp refers to a list. This allows the F# type system to infer that Length refers to a property associated with values of the list type: let length (inp : 'a list) = inp.Length Here the 'a indicates that the length function is generic; that is, it can be used with any type of list. We cover generic code in more detail in 3 and 5. Type annotations can be useful documentation and, when needed, should generally be added at the point where a variable is declared. As you can see from the use of the dot-notation, F# is both a functional language and an object-oriented language. In particular, properties are a kind of member, a general term used for any functionality associated with a type or value. Members referenced by prefixing a type name are called static members, and members associated with a particular value of a type are called instance members; in other words, instance members are accessed through an object on the left of the dot. We discuss the distinction between values, properties, and methods later in this chapter, and we discuss members in full in 6. Sometimes explicitly named functions play the role of members. For example, we could have written the earlier code as follows:
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