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APPENDIX A: COMPARING POWERSHELL
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This time, the three values all end up in $a because the array is passed by reference as a single argument instead of the elements being distributed across the arguments. Finally a common question that Perl users ask is if PowerShell has the equivalent of the Perl map operation. The answer is yes approximately. The ForeachObject cmdlet (or its alias %) is essentially the equivalent of Perl s map. The Perl map operation looks like:
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map <BLOCK> <LIST>
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and the PowerShell equivalent is
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<LIST> | foreach <BLOCK>
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In practice, the Foreach-Object cmdlet is more powerful than map because it also allows initialization and completion blocks:
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$list | foreach {begin code } {process code } {end code }
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And of course, because it is a pipelined operation, it is more easily composable than the map operator. For example, here s a way to find out what cmdlets have no alias that takes advantage of nested pipelines with begin and end blocks:
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gal | %{$ac = @{}} {$ac[$_.definition] = $true} { gcm | {! $ac[$_.name]}}
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This example initializes a hashtable in $ac in the begin clause, then for each alias returned by gal, it adds the definition as the hashtable key and sets its value to true. Finally, in the end clause it uses the where-object cmdlet (whose alias is ) to filter the output of gcm so only commands that don t have entries in the hashtable are emitted.
POWERSHELL AND C#
PowerShell is syntactically quite similar to C#. For example, the flow-control statements are mostly the same in PowerShell as they are in C# (except that PowerShell is not case-sensitive). There are, however, a number of common problems that C# users encounter when they start using PowerShell. These problems stem from the fact that PowerShell has shell-like parsing and semantics. These issues are documented at some length in chapter 11, but we ll reiterate them here in a condensed form.
A.4.1
Calling functions and commands PowerShell functions are commands and are invoked like commands, not like methods. This means that if you have a function called my-function that takes three arguments, it will be invoked like:
my-command 1 2 3
my-command(1,2,3)
APPENDIX A: COMPARING POWERSHELL
The latter example is actually invoking the command with a single argument that is an array of three values, not three separate arguments. A.4.2 Calling methods Methods are invoked in PowerShell as they are in C# except that spaces are not permitted between the name of a method call and the opening parenthesis of the arguments. Therefore the expression
$data.method($a1, $a2)
is valid but
$data.method ($a1, $a2)
will result in a syntax error. Similarly, spaces are not permitted around the period (.) between the expression and the method name. These restrictions are needed because of the way PowerShell parses expressions and how it parses command parameters. Because command parameters are separated by spaces, allowing spaces in method calls can lead to confusion. 2 discusses this topic in much greater detail. A.4.3 Returning values PowerShell supports multiple implicit returns from a function. By implicit, we mean that values are simply emitted from a function without using the return statement. The following function
function foo { 13 }
will return the number 13, and the function
function bar ( 10; 11; 12 }
will return three values: 10, 11, and 12. While this seems odd in a programming language, it makes perfect sense in a shell (remember, it s named PowerShell for a reason). In fact, this characteristic can greatly simplify our code because we don t need to explicitly accumulate the data when we want to return a collection from a function. The system will take care of that for us. A corollary is that, by default, the return value of a statement is not voided. This means that if we call a method that returns a value we aren t going to use, we have to explicitly discard it, either by casting it to [void] or redirecting output to $null. For example, adding a value to an ArrayList returns a number indicating the number of elements in the collection. See chapter 7 for the full details of the behavior of PowerShell functions. A.4.4 Variables and scoping Unlike most programming languages, PowerShell is dynamically scoped. This means that the variables in the calling function are visible in the called function. Variables
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