Data commit

Task/Ranking-methods/PowerShell/ranking-methods-1.psh

@@ -0,0 +1,142 @@
+function Get-Ranking
+{
+    [CmdletBinding(DefaultParameterSetName="Standard")]
+    [OutputType([PSCustomObject])]
+    Param
+    (
+        [Parameter(Mandatory=$true,
+                   ValueFromPipeline=$true,
+                   ValueFromPipelineByPropertyName=$true,
+                   Position=0)]
+        [string]
+        $InputObject,
+
+        [Parameter(Mandatory=$false,
+                   ParameterSetName="Standard")]
+        [switch]
+        $Standard,
+
+        [Parameter(Mandatory=$false,
+                   ParameterSetName="Modified")]
+        [switch]
+        $Modified,
+
+        [Parameter(Mandatory=$false,
+                   ParameterSetName="Dense")]
+        [switch]
+        $Dense,
+
+        [Parameter(Mandatory=$false,
+                   ParameterSetName="Ordinal")]
+        [switch]
+        $Ordinal,
+
+        [Parameter(Mandatory=$false,
+                   ParameterSetName="Fractional")]
+        [switch]
+        $Fractional
+    )
+
+    Begin
+    {
+        function Get-OrdinalRank ([PSCustomObject[]]$Values)
+        {
+            for ($i = 0; $i -lt $Values.Count; $i++)
+            {
+                $Values[$i].Rank = $i + 1
+            }
+
+            $Values
+        }
+
+        function Get-Rank ([PSCustomObject[]]$Scores)
+        {
+            foreach ($score in $Scores)
+            {
+                $score.Group | ForEach-Object {$_.Rank = $score.Rank}
+            }
+
+            $Scores.Group
+        }
+
+        function New-Competitor ([string]$Name, [int]$Score, [int]$Rank = 0)
+        {
+            [PSCustomObject]@{
+                Name  = $Name
+                Score = $Score
+                Rank  = $Rank
+            }
+        }
+
+        $competitors = @()
+        $scores = @()
+    }
+    Process
+    {
+        @($input) | ForEach-Object {$competitors += New-Competitor -Name $_.Split()[1] -Score $_.Split()[0]}
+    }
+    End
+    {
+        $scores = $competitors |
+            Sort-Object   -Property Score -Descending |
+            Group-Object  -Property Score |
+            Select-Object -Property @{Name="Score"; Expression={[int]$_.Name}}, @{Name="Rank"; Expression={0}}, Count, Group
+
+        switch ($PSCmdlet.ParameterSetName)
+        {
+            "Standard"
+            {
+                $rank = 1
+
+                for ($i = 0; $i -lt $scores.Count; $i++)
+                {
+                    $scores[$i].Rank = $rank
+                    $rank += $scores[$i].Count
+                }
+
+                Get-Rank $scores
+            }
+            "Modified"
+            {
+                $rank = 0
+
+                foreach ($score in $scores)
+                {
+                    $rank = $score.Count + $rank
+                    $score.Rank = $rank
+                }
+
+                Get-Rank $scores
+            }
+            "Dense"
+            {
+                for ($i = 0; $i -lt $scores.Count; $i++)
+                {
+                    $scores[$i].Rank = $i + 1
+                }
+
+                Get-Rank $scores
+            }
+            "Ordinal"
+            {
+                Get-OrdinalRank $competitors
+            }
+            "Fractional"
+            {
+                Get-OrdinalRank $competitors | Group-Object -Property Score | ForEach-Object {
+                    if ($_.Count -gt 1)
+                    {
+                        $rank = ($_.Group.Rank | Measure-Object -Average).Average
+
+                        foreach ($competitor in $_.Group)
+                        {
+                            $competitor.Rank = $rank
+                        }
+                    }
+                }
+
+                $competitors
+            }
+        }
+    }
+}

Task/Ranking-methods/PowerShell/ranking-methods-2.psh

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+$scores = "44 Solomon","42 Jason","42 Errol","41 Garry","41 Bernard","41 Barry","39 Stephen"

Task/Ranking-methods/PowerShell/ranking-methods-3.psh

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+$scores | Get-Ranking -Standard

Task/Ranking-methods/PowerShell/ranking-methods-4.psh

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+$scores | Get-Ranking -Modified

Task/Ranking-methods/PowerShell/ranking-methods-5.psh

@@ -0,0 +1 @@
+$scores | Get-Ranking -Dense

Task/Ranking-methods/PowerShell/ranking-methods-6.psh

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+$scores | Get-Ranking -Ordinal

Task/Ranking-methods/PowerShell/ranking-methods-7.psh

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+$scores | Get-Ranking -Fractional