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By Paul Lomax
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Run the script again, with the mistake still there. " We now know what we are looking for: the message tells us that we haven't declared a variable, and gives us the line number on which the error occurred. Even in a complex script, it usually takes only a couple of seconds to find and correct the bug. Using Option Explicit is good programming practice. It forces us to declare all variables and constants with Dim, and, should we make an error in the script, makes it easier to find. 6 Array Variables The types of variables we have dealt with so far have contained single values, or, to give them their correct title, are scalar variables.
Before we look at the types of arrays we have 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 are known as elements, and the reference number we use to access these elements is known as an index. The lowest and highest index numbers are known as bounds or boundaries. There are four main types of arrays: arrays can be either fixed or dynamic; arrays can also be either one-dimensional or multidimensional.
This location is of no consequence to us; all we have to do is remember the name. When we use the name, the script engine will go to the correct memory location and either retrieve the data stored there or change the data, depending upon our instructions. It is important therefore to learn the rules for naming variables: • Variable names can be no more than 255 characters in length. Variable names tend to become pretty unreadable after about 20 characters anyhow, which then defeats the purpose of having longer variable names.