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Download VB and VBA in a Nutshell: The Languages by Paul Lomax PDF

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By Paul Lomax

The net documentation of VB/VBA language elements follows the 80/20 rule: the fundamental evidence you'll want to use a language assertion are supplied within the documentation. however the extra 20 percentage you'll want to use it successfully is conspicuously absent. to a pro VB/VBA programmer, this lacking documentation isn't really a luxurious; it's a necessity. In VB & VBA in a Nutshell: The Language , it is ultimately on hand. This publication boils down the necessities of the VB and VBA languages right into a unmarried quantity, together with undocumented and little-documented parts crucial to daily programming. the majority of the e-book is an alphabetical reference to the statements, strategies, and features of the VB/VBA language. each one access contains its syntax, a longer dialogue of ways the language build works, programming assistance for utilizing the build successfully, and "gotchas" to prevent on your programming. despite how a lot event you've gotten programming with VBA, this can be the booklet you are going to choose up time and time back, either as your usual reference advisor and as a device for troubleshooting and making a choice on programming difficulties.

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Depending on the expected size of the array, we could select any number greater than one, or we could even double the size of the array as long as we were reasonably certain that the array would remain fairly small (geometric progression has a habit of consuming memory very rapidly). Array Variables VB & VBA in a Nutshell: The Language, eMatter Edition Copyright © 2000 O’Reilly & Associates, Inc. All rights reserved. 41 Variables & Data Types There is no limit to the number of times you can redimension a dynamic array, but obviously, messing around with variables in this way carries an element of risk.

In the next section you’ll see how to check the size of the array before attempting to access a given element. Dynamic Arrays Fixed arrays are fine when we know in advance how many values or elements we need. But there are many cases where we do not have prior knowledge of this, and we need a way to expand our array should we have to. For example, one convenient use of an array is to store input from the user and allow the user to input as many items of data as he or she likes. Our application therefore has no way of knowing how to dimension the array beforehand.

Nothing keyword Used only with object variables to determine either if a variable has a valid object reference, as in: If objVar Is Not Nothing Then or to destroy a current object reference, as in: Set objvar = Nothing Array Variables Before we look at the types of arrays at our disposal, let’s quickly cover some of the terminology used when talking about arrays. , defining its size). The individual data items within the array Array Variables VB & VBA in a Nutshell: The Language, eMatter Edition Copyright © 2000 O’Reilly & Associates, Inc.

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