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Scriptblocks and objects
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8.1 Scriptblock basics 215 8.2 Building and manipulating objects 222 8.3 A closer look at the type-system plumbing 233 8.4 Extending the PowerShell language 237 8.5 Type extension 243 8.6 Building code at runtime 245 8.7 Summary 249
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Philosophy have I digested, The whole of Law and Medicine, From each its secrets I have wrested, Theology, alas, thrown in. Poor fool, with all this sweated lore, I stand no wiser than I was before.
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Johann Wolfgang Goethe, Faust
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Greek letters are cool
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Not actually a quote from Beavis and Butthead
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7 covered the basic elements of programming in PowerShell: functions and scripts. In this chapter, we ll take things to the next level and talk about metaprogramming. Metaprogramming is the term used to describe the activity of writing programs that write or manipulate other programs. If you re not already familiar with this concept, you may be asking why you should care. In chapter 1, we talked about designing 214
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classes and how hard it is to get those designs right. In most environments, if the designer makes a mistake then the user is stuck with the result. This is not true in PowerShell. Metaprogramming lets us delve into the heart of the system and make things work the way we need them to. Here s an analogy that should give you the full picture. Imagine buying a computer that was welded shut. There is still a lot you can do with it run all the existing programs and even install new programs. But there are some things you can t do. If it doesn t have any USB ports then you can t add them. If it doesn t have any way to capture video, you can t add that either without opening the case. And even though most people buy a computer with the basic features they need and never add new hardware, a case that s welded shut allows for no hardware tinkering. Traditional programming languages are much like the welded computer. They have a basic set of features, and while you can extend what they do by adding libraries, you can t really extend the core capabilities of the language. For example, you can t add a new type of looping statement. On the other hand, in a language that supports metaprogramming, you can undertake such activities as adding new control structures. This is how the Where-Object and Foreach-Object cmdlets are implemented. They use the metaprogramming features in PowerShell to add new language elements. You can even create your own versions of these commands. Metaprogramming is one of the features that make dynamic languages such as PowerShell extremely powerful. That power translates into dramatic improvements in conceptual and code simplicity. Investing the time to learn how to use PowerShell s metaprogramming capabilities can significantly increase your productivity with PowerShell. Now let s get started with cracking open the case on PowerShell. We ll begin with a discussion of a feature in the PowerShell language called scriptblocks. This discussion takes up the first part of this chapter and lays the groundwork for the rest of what we ll discuss. With the basic material out of the way, we ll look at how and where this scriptblock feature is used in PowerShell. We ll look at the role scriptblocks play in the creation of custom objects and types, and how they can be used to extend the PowerShell language. We ll go through an example that uses less than a hundred lines of PowerShell script to add a new keyword that allows you to define your own classes in PowerShell. We ll also cover several cmdlets that make use of these objects, and we ll wrap up with a look at some programming patterns that take advantage of scriptblocks. (Programming patterns are common approaches to solving a particular class of problems in other words, common sense with a fancy name.) But first we need to understand scriptblocks themselves.
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