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Functions are at the heart of most F# programming. It s not surprising that the first thing the wordCount function does is call a function in this case, the splitAtSpaces function, which is the first function defined in the program: let wordCount (text: string) = let words = splitAtSpaces text Let s first investigate the splitAtSpaces function by running F# Interactive:

In this profile we apply a default deny policy, import our base.sb profile, import provisions from base.sb defined in shell.dependencies, and then provide access to our user home directories. But what about that last line:

> splitAtSpaces "hello world";; val it : string list = [ "hello"; "world" ] You can see that splitAtSpaces breaks the given text into words, splitting at spaces. In the earlier code, you can also see examples of the following: Literal characters such as ' ' and 'a' Literal strings such as "hello world" Literal lists of strings such as the returned value [ "hello"; "world" ]

(allow process-exec file-read-data file-read-metadata (literal "/usr/local/bin/sbshell"))

This chapter will discuss using Google Maps and other location-conscious apps on your phone for both business and pleasure. You ll learn how to use your phone for driving directions, deciding where to eat, and letting your friends know where to find you.

3 covers literals and lists in detail. Lists are an important data structure in F#, and you see many examples of their use in this book.

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Well, remember that in order to apply a profile to an environment, we do so using the sandbox-exec command. In order to do this to a user s shell, we have to create a wrapper script which performs the function. In this case, that wrapper script is defined at /usr/local/bin/sbshell and is detailed below.

The F# compiler and F# Interactive use the indentation of F# code to determine where constructs start and finish. The indentation rules are very intuitive; we discuss them in the appendix, which is a guide to the F# syntax. Listing 2-2 shows a fully qualified version of the wordCount function. Listing 2-2. A Version of the wordCount Function Using Explicit in Tokens /// Analyze a string for duplicate words let wordCount text = let words = splitAtSpaces text in let wordSet = Set.ofList words in let numWords = words.Length in let numDups = words.Length - wordSet.Count in (numWords,numDups) Double semicolons (;;) are still required to terminate entries to F# Interactive. However, if you re using an interactive development environment such as Visual Studio, then the environment typically adds them automatically when code is selected and executed. We show the double semicolons in the interactive code snippets used in this book, although not in the larger samples. Sometimes it s convenient to write let definitions on a single line. You can do this by separating the expression that follows a definition from the definition itself using in. For example: let powerOfFour n = let nSquared = n * n in nSquared * nSquared Here s an example use of the function: > powerOfFour 3;; val it : int = 81 Indeed, let pat = expr1 in expr2 is the true primitive construct in the language, where pat stands for pattern and expr1 and expr2 stand for expressions. The F# compiler inserts the in if expr2 is columnaligned with the let keyword on a subsequent line.

As mentioned, to apply the sandbox profiles mentioned previously to our logged-in users, we ll need to create a wrapper script to accomplish our task. We can do this by creating a very basic shell script that executes the user s normal shell program within the confines of our desired sandbox profile. As can be seen in the following, this shell simply calls the shell found at /bin/bash. This shell is passed through all parameters that were passed to the original shell (designated by $@ ) to properly function with any parameters passed to the shell (utilized by commands such as ssh and rsync).

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