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The Preserve keyword is optional, and is used to indicate that when the array is changed to its new size, existing elements are kept in the array Without this keyword, we would be throwing away the array s contents each time we altered its size In some situations, we might actually want to do that (and the resizing operation is much faster as a result) Most of the time, when we resize an array, we intend to either increase or decrease its size, but keep all of the existing members that will t in the new size of array Note that the array is being resized by three elements at a time We could have used any number three was used here simply so that if you try the code out, you won t have to do much typing to see the effect of resizing We could have resized one element at a time, but this is very inef cient, since each addition beyond the initial size will cause a ReDim operation, which will involve moving all of the array reference variables to a new version of the array and then destroying the old one When designing a program that relies on resizing arrays, it is often necessary to work out what the most ef cient increment in size might be A number of factors are signi cant to this: the rate at which the array lls up, how often items are added to the array compared to how often items in the array are accessed, and the initial size of the array compared to the amount of memory available to the program Some programmers go for a strategy they know has worked in the past for example, doubling the array size each time it lls up, or adding 10% to its current size Others will try a number of different strategies in simulations until they nd the most ef cient one for the application under development Happily, this is not a problem that you will encounter too often, since NET provides a lot of other ways of dealing with unknown numbers of data elements.

Annotations are conventionally placed before all other modi ers, but this is not a requirement; they may be freely intermixed with other modi ers

There are three kinds of annotations The rst (normal annotation) is fully general The others (marker annotation and single-element annotation) are merely shorthands Annotations: Annotation Annotations Annotation Annotation: NormalAnnotation MarkerAnnotation SingleElementAnnotation

We can also resize arrays with more that one dimension, but in this case, we are only allowed to change the last dimension if the Preserve keyword is used, eg Listing 620

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IN THIS CHAPTER When you started using Windows, you had to learn all kinds of new terms, like minimize and mouse Scripting has a language all its own, too, and in this chapter, you'll learn the anatomy of a script and what some of those special terms mean Every good book has a structure This book, for example, includes an introduction and some introductory chapters Most of the book is taken up with explanatory chapters and examples There's an appendix, an index, and a table of contents All of these elements work together to make the book useful for a variety of purposes, including learning, referencing, and so forth Scripts have a structure, too The main body of the script is a bit like its table of contents, organizing what the script will do Functions and subroutines are the chapters of the book and perform the actual work Finally, there are comments and documentation, which act as an index and help provide cross-references and meaning to the actual script code Do you really need to know these things to pump out a useful administrative script Not at all In fact, if your goal is to start programming as quickly as possible, skip ahead to the next chapter However, understanding the structure of a good script can help make scripting easier, make your scripts more useful, and save you a lot of time and effort in the long run < Day Day Up >

A normal annotation is used to annotate a program element: NormalAnnotation: @ TypeName ( ElementValuePairsopt )

Dim n(2, 3, 4) As Integer 'Code using array at original size ReDim Preserve n(2, 5, 6)'Illegal can only change the 'last dimension if using Preserve Dim n(2, 3, 4) As Integer 'Code using array at original size ReDim Preserve n(2, 3, 6)'But this is legal Listing 620: Limitations in re-dimensioning a multi-dimension array

ElementValuePairs: ElementValuePair ElementValuePairs , ElementValuePair ElementValuePair: Identi er = ElementValue

This limitation comes about because it is relatively easy to change the last dimension of an existing array, but more dif cult to change the others (think how confusing it might be to alter a table of data by adding extra columns to it what happens to all of the rows that had the original number of columns) Of course, if we can throw away the contents and start again, resizing any dimension is as easy as creating the array in the rst place

Note that the at-sign (@) is a token unto itself Technically it is possible to put whitespace in between the at-sign and the TypeName, but this is discouraged

ReDim cannot be used to change the number of dimensions of an array, but this is probably a good limitation, since otherwise we could never be sure of the number of dimensions an array had and we would have problems writing code to refer to array elements with a variable number of commas In general, arrays are good where we can predict the number of items of data we will have to deal with In such situations, an array is a very ef cient way to manipulate multiple items of data They are also useful where we may need to deal with a number of items of data that only changes infrequently compared to the number of times the existing elements are accessed

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