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TYPE CONVERSIONS
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If the argument type is a collection, we create a collection of the parameter type with length equal to the number of values contained in the argument value. Each value is then coerced to the appropriate element type for the new collection using the recursive application of this algorithm. If none of these steps worked, use the conversion in table 3.6. If those fail, then the overall parameter binding attempt fails. Once again, this is a level of detail that you don t usually need to consider, but it s useful to know it s available when you need it. You now know everything you need to know about how types work on PowerShell. Well, not quite everything. In the next two chapters, we ll discuss how the PowerShell operators build on this basic type foundation. But for now, we re through!
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A solid understanding of the PowerShell type system will allow you to use PowerShell most effectively. By taking advantage of the built-in type system and conversions, you can accomplish startlingly complex tasks with little code. In this chapter, we covered the following topics: The PowerShell type system, how it works, and how you can use it. The basic PowerShell types and how they are represented in PowerShell script (literals). Some of the more advanced types hashtables and arrays. The use of type literals in type casts and as a way to call static methods. The type conversion process for language conversions, the pre-conversion steps that are used by the parameter binder, and the relationship between the PowerShell types and the underlying .NET types.
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WORKING WITH TYPES
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Operators and expressions
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4.1 Arithmetic operators 89 4.2 The assignment operators 96 4.3 Comparison operators 101 4.4 The pattern matching operators 107 4.5 Logical and bitwise operators 4.6 Summary 113 113
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Operators, Mr. Rico! Millions of them! Robert A. Heinlein, Starship Troopers, paraphrased
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This chapter covers two of the basic elements of the PowerShell language: operators and expressions. PowerShell has operators. Lots of operators the full complement you would expect in a conventional programming language and several more. In addition, PowerShell operators are typically more powerful than the corresponding operators in conventional languages such as C or C++. So, if you invest the time to learn what the PowerShell operators are and how they work, in a single line of code you will be able to accomplish tasks that would normally take a significant amount of programming. Here s an example of the kind of thing that can be done using just the PowerShell operators. Say we have a file old.txt with the following text in it:
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Hello there. My car is red. Your car is blue. His car is orange and hers is gray. Bob's car is blue too. Goodbye.
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Our task is to copy this content to a new file, making certain changes. In the new file, the word is should be replaced with was , but only when it s in front of the words red or blue . In most languages, this would require a fairly complex program. In PowerShell, it takes exactly one line. Here s the script . It uses the -replace operator along with output redirection and variable namespaces. The -replace operator is decribed later in this chapter. Redirection and variable namespaces are features for working with files that are covered in chapter 5.
AUTHOR S NOTE
For the impatient reader, the notation ${c:old.txt} says: return the contents of the file old.txt from the current working directory on the C: drive. In contrast, ${c:\old.txt} says get the file old.txt from the root of the C: drive.
${c:old.txt} -replace 'is (red|blue)','was $1' > new.txt
After running this script, the content of new.txt looks like:
Hello there. My car was red. Your car was blue. His car is orange and hers is gray. Bob's car was blue too. Goodbye.
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