PowerShell question

What does this variable do in PowerShell?   @( )    As well as this one?  @{n=

Thank you!!
Anthony K O365Asked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
@() is for arrays, and @(n=xxx) is to get the array item xxx from there

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oBdACommented:
The "@()" is just the definition of an array:
$SomeIntegerArray = @(1, 2, 3, 4)

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In general, "@{}" defines a hash table, which is basically an array that doesn't use a numeric index but Key-Value pairs.
$SomeHashTable = @{foo=1; bar=2}
$SomeHashTable['foo']

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Windows PowerShell Tip of the Week > Working with Hash Tables
https://technet.microsoft.com/en-us/library/ee692803.aspx

In this case, the "@{n=" looks like the definition of a hash table used for a "Calculated Property"; with Select-Object, you can define additional properties on the fly.
The example taken from the link below will get the items in a folder and generate a new property "Kbytes" to have the file size available in KB (by default, the size is returned in bytes).
Get-ChildItem C:\Test | Select-Object Name, CreationTime,  @{Name="Kbytes";Expression={$_.Length / 1Kb}}

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The keys "Name" (the name of the new property) and "Expression" (the expression used to generate the value of the new property) of the hash table can be shortened to "n" and "e".
Get-ChildItem C:\Test | Select-Object Name, CreationTime,  @{n="Kbytes";e={$_.Length / 1Kb}}

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Windows PowerShell Tip of the Week > Using Calculated Properties
https://technet.microsoft.com/en-us/library/ff730948.aspx
Anthony K O365Author Commented:
Excellent! This helps as I'm still ramping up on PowerShell.
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