Version 1.6

added Group-ObjectFast

PSOneTools/1.6/Group-ObjectFast.ps1

@@ -0,0 +1,89 @@
+
+
+function Group-ObjectFast
+{
+    [CmdletBinding(DefaultParameterSetName='Analysis')]
+    param
+    (
+        [Parameter(Mandatory)]
+        [string[]]
+        $Property,
+
+        [Parameter(ParameterSetName='Analysis')]
+        [Switch]
+        $NoElement,
+
+        [Parameter(ParameterSetName='Separation')]
+        [Switch]
+        $AsHashtable,
+
+        [Parameter(ParameterSetName='Separation')]
+        [Switch]
+        $AsString,
+
+        [Parameter(Mandatory, ValueFromPipeline)]
+        [object]
+        $InputObject
+    )
+
+    begin
+    {
+        # create an empty hashtable
+        $hashtable = @{}
+    }
+
+
+    process
+    {
+        # calculate the unique key based on the properties
+        # submitted by the user
+        if ($AsString -or $PSCmdlet.ParameterSetName -eq 'Analysis')
+        {
+            $key = $(foreach($_ in $Property) { $InputObject.$_ }) -join ','
+        }
+        else
+        {
+            $key = foreach($_ in $Property) { $InputObject.$_ }
+        } 
+
+        # check to see if the key is present already
+        if ($hashtable.ContainsKey($key) -eq $false)
+        {
+            # add an empty array list 
+            $hashtable[$key] = [Collections.Arraylist]@()
+        }
+
+        # add element to appropriate array list:
+        $null = $hashtable[$key].Add($InputObject)
+    }
+
+    end
+    {
+        if ($AsHashtable)
+        {
+            return $hashtable
+        }
+        elseif ($NoElement)
+        {
+            foreach($_ in $hashtable.Keys)
+            {
+                [PSCustomObject]@{
+                    Count = $hashtable[$_].Count
+                    Name = $key
+                }
+            }
+        }
+        else
+        {
+            foreach($_ in $hashtable.Keys)
+            {
+                [PSCustomObject]@{
+                    Count = $hashtable[$_].Count
+                    Name = $key
+                    Group = $hashtable[$_]
+                }
+            }
+        }
+    }
+
+}