What's wrong on me if I'm taking Microsoft's sample and it doesn't work?
The sample command and the expected result:
@(
@{ name = 'a' ; weight = 7 }
@{ name = 'b' ; weight = 1 }
@{ name = 'c' ; weight = 3 }
@{ name = 'd' ; weight = 7 }
) | Group-Object -Property weight -NoElement
Count Name
----- ----
1 1
1 3
2 7
The latest Windows 10 Enterprise 22H2.
This issue isn't reproducible in PowerShell 7 latest, but in Windows PowerShell 5.1 Group-Object with a string property (-Property weight) doesn't know how to handle incoming hash tables (@{ ... }) from pipeline but you can help it using a calculated expression instead:
@(
@{ name = 'a' ; weight = 7 }
@{ name = 'b' ; weight = 1 }
@{ name = 'c' ; weight = 3 }
@{ name = 'd' ; weight = 7 }
) | Group-Object -Property { $_.weight } -NoElement
Or make them objects instead of hashtables:
@(
@{ name = 'a' ; weight = 7 }
@{ name = 'b' ; weight = 1 }
@{ name = 'c' ; weight = 3 }
@{ name = 'd' ; weight = 7 }
) | % { [pscustomobject]$_ } | Group-Object -Property weight -NoElement
Count Name
----- ----
2 7
1 1
1 3
The docs default to powershell 7, which I'm not a fan of.
