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(pat, ... ,pat) [pat; ... ;pat] [| pat; ...; pat |] { id=pat; ...; id=pat } Tag(pat, ... ,pat) pat | pat pat & pat pat as id id _ Any literal : type null

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Tuple pattern List pattern Array pattern Record pattern Tagged union or active pattern Or pattern And pattern Named pattern Variable pattern Wildcard pattern Constant pattern Type test pattern Null test pattern

It s easy to deliver Managed Preferences data to all your managed machines if they are connected to an Apple Open Directory server, either as the sole directory service, or as part of a magic triangle or "dual directory" configuration, where your managed computers are connected to an Open Directory server in addition to another directory. If you don t have an Open Directory server, it s also possible, as we saw in the previous chapter, to modify Active Directory or third-party LDAP implementations to contain Managed Preferences data. But what can you do if either of the following is true You don t have a central directory service. You have a central directory you can t or don t want to modify to contain Managed Preferences data.

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(1,2,("3",x)) [x;y;z] [| "cmd"; arg1; arg2 |] { X=1; Y=2 } Point(x,y) [x] | ["X";x] [p] & [Point(x,y)] [x] as inp x _ 36, "36", 27L, System.DayOfWeek.Monday : string null

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Pattern matching can be used to decompose structured values. Here is an example where we match nested tuple values: let highLow a b = match (a,b) with | ("lo", lo), ("hi", hi) -> (lo,hi) | ("hi", hi), ("lo", lo) -> (lo,hi) | _ -> failwith "expected a both a high and low value";; The match examines two pairs and looks at the strings in the first element of each, returning the associated values: > highLow ("hi",300) ("lo",100);; val it : int * int = (100,300) The first rule matches if the first parts of the input pairs are the strings "lo" and "hi", respectively. It then returns a pair made from the respective second parts of the tuples. The second rule is the mirror of this in case the values appeared in reverse order. The final cases of both of the previous examples use wildcard patterns to cover remaining cases. This makes the patterns exhaustive. Frequently, no wildcard is needed to ensure this, because for many input types F# is able to determine whether the given set of rules is sufficient to cover all possibilities for the given shape of data. However, if a match is not exhaustive, a warning is given: > let urlFilter3 url agent = match url,agent with | "http://www.control.org", 86 -> true | "http://www.kaos.org", _ -> false;; match url,agent with ^^^^^^^^^^^^^^^^^^^^ warning: Incomplete pattern match. In these cases, it may be necessary to add an extra exception-throwing clause to indicate to the F# compiler that the given inputs are not expected: let urlFilter4 url agent = match url,agent with | "http://www.control.org", 86 -> true | "http://www.kaos.org", _ -> false | _ -> failwith "unexpected input" Nonexhaustive matches are automatically augmented by a default case where a MatchFailureException is thrown. We discuss exceptions in 4.

Are you out of luck No. You can still deliver Managed Preferences data to the local directory service. If you look back to 3, you ll remember that we discussed the local directory service and the directory service search path. Figure 7-1 might serve as a reminder.

F# is frequently able to determine whether pattern-matching rules are redundant, such as if a rule can never be selected because previous rules subsume all such cases. In this case, a warning is given. For example: > let urlFilter2 url agent = match url,agent with | "http://www.control.org", _ -> true | "http://www.control.org", 86 -> true | _ -> false;; | "http://www.control.org", 86 -> true ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ warning: This rule will never be matched.

Tip Use wildcard patterns with care. F# can often determine whether a match is exhaustive, and the use

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