ForEach

TIP

Use foreach or % alias for ForEach-Object.

Works like Select

ForEach-Object can do the same thing as Select-Object -ExpandProperty.

gci | foreach Name
# or
gci | foreach { $_.Name }
# equivalent to 
gci | select -ExpandProperty Name

The way ForEach-Object behaves is collecting implicitly returned values as an array. Every implicitly returned value will be collected as a item.

gci | foreach { $_.Exists, $false } # True, False, True, False...

If you do want a $null return, use Out-Null to swallow the value.

# doesn't make much sense though
$null -eq (gci | foreach { $_.Name | Out-Null }) # True

NOTE

One exception is ForEach-Object can execute method by name. You might expect delegate objects to be returned, but no, values of the method being executed will be returned.

(1,2,3 | % GetType | select -first 1) -is [System.Type] # True