Variable scoping in PowerShell

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The PowerShell scopes article (about_Scopes) is nice, but too verbose, so this is quotation from my article:

In general, PowerShell scopes are like .NET scopes. They are:

  • Global is public
  • Script is internal
  • Private is private
  • Local is current stack level
  • Numbered scopes are from 0..N where each step is up to stack level (and 0 is Local)

Here is simple example, which describes usage and effects of scopes:

$test="Global Scope"
Function Foo {
    $test="Function Scope"
    Write-Host $Global:test                                  # Global Scope
    Write-Host $Local:test                                   # Function Scope
    Write-Host $test                                         # Function Scope
    Write-Host (Get-Variable -Name test -ValueOnly -Scope 0) # Function Scope
    Write-Host (Get-Variable -Name test -ValueOnly -Scope 1) # Global Scope
}
Foo

As you can see, you can use $Global:test like syntax only with named scopes, $0:test will be always $null.

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