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Mutable data is often hidden behind an encapsulation boundary. 7 looks at encapsulation in more detail, but one easy way to do this is to make data private to a function. For example, the following shows how to hide a mutable reference within the inner closure of values referenced by a function value: let generateStamp = let count = ref 0 (fun () -> count := !count + 1; !count) val generateStamp: unit -> int The line let count = ref 0 is executed once, when the generateStamp function is defined. Here is an example of the use of this function: > generateStamp();; val it : int = 1 > generateStamp();; val it : int = 2 This is a powerful technique for hiding and encapsulating mutable state without resorting to writing new type and class definitions. It s good programming practice in polished code to ensure that all related items of mutable state are collected under some named data structure or other entity such as a function.

Subsequently, as discussed earlier, you can view the ACLs on that file by passing the e flag to ls as follows:

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F# encourages the use of objects whose logical identity (if any) is based purely on the characteristics (for example, fields and properties) of the object. For example, the identity of a pair of integers (1,2) is determined by the two integers themselves; two tuple values both containing these two integers are for practical purposes identical. This is because tuples are immutable and support structural equality, hashing, and comparison, discussed further in s 5 and 8. Mutable reference cells are different; they can reveal their identities through aliasing and mutation. However, not all mutable values necessarily reveal their identity through mutation. For example, sometimes mutation is used just to bootstrap a value into its initial configuration, such as when connecting the nodes of a graph. These are relatively benign uses of mutation.

System.Object.ReferenceEquals. You can also use this function on immutable values to detect whether

ls -ael test.txt -rw-r--r--+ 1 hunterbj staff 0 Jul 9 00:56 test.txt 0: user:hunterbj allow read,write,execute,delete,append,readattr,writeattr, readextattr,writeextattr,readsecurity,writesecurity,chown

famous buildings. Goggles analyzes any photo you take with it and attempts to identify the object and find it in search. If it can t identify the object, it looks for visually similar images. Goggles is currently not much more than a novelty, but in the future it may end up being an easier way to search than typing search terms into your phone.

two values are represented by the physically same value. But in this circumstance, the results returned by the function may change according to the optimization settings you apply to your F# code.

Likewise, if you want to grant full control of a directory, run:

You saw in the previous section that mutable references must be explicitly dereferenced. F# also supports mutable locals that are implicitly dereferenced. These must either be top-level definitions or be local variables in a function: > let mutable cell1 = 1;; val mutable cell1 : int = 1 > cell1;; val it : int = 1 > cell1 <- 3;; val it : unit = () > cell1;; val it : int = 3 The following shows how to use a mutable local: let sum n m = let mutable res = 0 for i = n to m do res <- res + i res > sum 3 6;; val it : int = 18 F# places strong restrictions on the use of mutable locals. In particular, unlike mutable references, mutable locals are guaranteed to be stack-allocated values, which is important in some situations because the .NET garbage collector won t move stack values. As a result, mutable locals may not be used in any inner lambda expressions or other closure constructs, with the exception of top-level mutable values, which can be used anywhere, and mutable fields of records and objects, which are associated with the heap allocated objects themselves. You learn more about mutable object types in 6. Reference cells and types containing mutable fields can be used instead to make the existence of heapallocated imperative state obvious.

chmod +a "hunterbj allow list,add_file,search,delete,add_subdirectory,delete_child, readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown, limit_inherit,only_inherit" testfolder

Mutable arrays are a key data structure used as a building block in many high-performance computing scenarios. The following example illustrates how to use a one-dimensional array of double values:

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