Create Function-Using-Clean-Block.ps1

Pwsh/Pipeline/Function-Using-Clean-Block.ps1

@@ -0,0 +1,60 @@
+#Requires -Version 7.3
+
+'See: <https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_functions_advanced_methods?view=powershell-7.4#clean>'
+
+function DoStuff {
+    [CmdletBinding()]
+    param(
+        # throw an exception that's handled
+        [switch]$ForceFail,
+
+        # throws an exception type that's not expected
+        [switch]$ForceUnexpected
+    )
+    end {
+        sleep .75
+        if( $ForceUnexpected ) {
+            Get-Item -ea 'Stop' 'foo\bar\does\not-exist.md'
+        }
+        if( $ForceFail ) {
+            throw 'Bad🔴'
+        }
+        'Good🟢'
+    }
+    clean {
+        # 7.3+ added the clean {... } block.
+        # see more: <https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_functions_advanced_methods?view=powershell-7.4#clean>
+        'DoStuff() => clean' | write-host -fore blue
+    }
+}
+function Main {
+    param(
+        [switch]$ForceFail,
+        [switch]$ForceUnexpected
+    )
+    try {
+        'Main() => try ' | write-host -fore blue
+        DoStuff -ForceFail $ForceFail -ForceUnexpected $ForceUnexpected
+    } catch {
+        if( $_.ToString() -match 'bad🔴' ) {
+            'Main() => expected fail'
+        } else {
+            throw $_ # let other error types bubble
+        }
+    }
+    finally {
+        'Main() => finally' | write-host -fore blue
+    }
+}
+
+## Examples
+DoStuff # clean. no errors
+DoStuff -ForceFail # force the expecteded error
+DoStuff -ForceUnexpected # force the expecteded error
+
+## examples wrapping DoStuff
+Main
+Main -ForceFail
+DoStuff -ForceUnexpected:$false
+# DoStuff -ForceUnexpected:$false -ForceFail
+# DoStuff -ForceUnexpected:$true