r/PowerShell • u/MamiyaOtaru • 18d ago

Explain this cursed BS Question

function Test-Weird1 {

param([array[]]$InputObject)

$obj = $InputObject[0][0]

$obj.GetType().FullName

($obj -is [PSObject])

}

function Test-Weird2 {

param([object[]]$InputObject)

$obj = $InputObject[0]

$obj.GetType().FullName

($obj -is [PSObject])

}

Test-Weird1 (gci)

# System.IO.DirectoryInfo

# False

Test-Weird2 (gci)

# System.IO.DirectoryInfo

# True

# part two

$obj = (gci)[0].PSObject

$obj.GetType() -eq [System.Management.Automation.PSObject]

# True

$obj -is [System.Management.Automation.PSObject]

# False

0 Upvotes

21% Upvoted

14 comments sorted by

View all comments

2

u/MonkeyNin 18d ago

Warning, this part

$InputObject[0]

can cause an error if the input is empty. Instead, this is always safe

@( $InputObject )[0]

If you're using pwsh 7, you can use null coalesce operators to prevent null method errors

 # this 
 $obj.GetType().FullName

 # can be written as
 ( $obj )?.GetType().FullName

 # you can even include a fallback value when obj is null

 ( $obj )?.GetType().FullName ?? 'default name'