The key can be any data type, but cannot be an array. The item can be anything: any data type, an object (including another Dictionary), or even an array. The Add method adds an item to the Dictionary, and associates that item with a key: The Dictionary class has four properties and six methods, as discussed below.
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That said, even when the finished product will use late binding to enhance potential multi-version support, developers will often enable early binding during the development process to gain access to Intellisense, and then convert the code to late binding when preparing the code for release to end users. With late binding, you do not set an explicit reference to an external library, and thus when declaring your variables you would use the more generic Object type, and to instantiate a class from that library you would have to use CreateObject:ĭim MyDictionary As Object Set MyDictionary = CreateObject("Scripting.Dictionary")ĭevelopers typically use late binding when there is a possibility that the version of an external library on the development computer may be different from the version(s) installed on the various end-user computers in many cases the VBA runtime engine will gracefully manage the difference with early binding, but late binding tends to be more robust in that regard. Select Microsoft Scripting Runtime from the list of installed libraries, and click OK. To add the reference to your VBA project, go to the VB Editor, and select Tools -> References from the menu. For example, with early binding, you can declare and create your Dictionary this way:ĭim MyDictionary As Scripting.Dictionary Set MyDictionary = New Scripting.DictionaryĮarly binding also enables Intellisense, or auto-completion, as you type your code, and projects using early binding will usually have faster performance than projects using late binding.
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With early binding, you explicitly add a reference to the Microsoft Scripting Runtime library, which then allows you free access to the classes, constants, properties, methods, etc. However, even for relatively simple needs, a Dictionary may offer a significant performance advantage, as suggested by the analysis at the end of this article.įinally, if there is any possibility that your code will have to be ported to VBScript, you may want to consider using a Dictionary instead of a Collection: Collections do not exist in VBScript, so any code using Collections would have to have them converted to Dictionaries anyway.īecause the Dictionary class is not part of the VBA library, to use Dictionaries in your VBA projects you must either use early binding or late binding. Then using a Dictionary object offers a compelling alternative to a Collection. Be able to accommodate changes in items and/or keys
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