public/Sort-UsingBubbleSort.ps1
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<#PSScriptInfo
.VERSION 1.0.0 .GUID 4c162cf5-5196-4ea0-8c43-1f4a460245f4 .FILENAME Sort-UsingBubbleSort.ps1 #> function Sort-UsingBubbleSort { <# .DESCRIPTION This function sorts objects using the bubble sort algorithm. This is the optimized version of bubblesort where already sorted items are skipped every pass. .PARAMETER InputObject Specify array of items to be sorted .EXAMPLE 3,2,1 | Sort-UsingBubbleSort #> [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingCmdletAliases', '', Justification = 'False positive, get-partition is not implictly called. partition is a internal function')] [CmdletBinding()] # Enabled advanced function support param( [parameter(ValueFromPipeline, Mandatory)]$InputObject ) BEGIN { $Unsorted = [collections.arraylist]::New() $script:Swaps = 0 $script:Compares = 0 $script:Passes = 0 } PROCESS { $InputObject | ForEach-Object { $null = $Unsorted.Add($PSItem) } } END { # Determine default sort property if ($null -ne $Unsorted[0].PSStandardMembers.DefaultKeyPropertySet) { Write-Warning -Message 'This object has a default sorting specified' } function bubbleSort { param ( $array ) $n = $array.Count # Do passes over array until last swap was at position 1 or less do { $script:passes++ # Reset last swap position $lastswap = 0 # Go through array up to lastswap and compare each neighbour for ($i = 1; $i -le ($n - 1); $i++) { $script:Compares++ if ($array[$i - 1] -gt $array[$i]) { swap -array $array -position $i -with ($i - 1) $lastswap = $i } } # Update $n with the position of the last swap to skip over already sorted items $n = $lastswap } until ($n -le 1) } function swap { param( $array, $position, $with ) $temp = $array[$position] $array[$position] = $array[$with] $array[$with] = $temp $script:Swaps++ } bubblesort -array $Unsorted Write-Verbose ('BubbleSort | Array length: {0} | Passes: {1} | Swaps: {2} | Compares: {3}' -f $Unsorted.count, $script:Passes, $script:swaps, $script:compares) return $Unsorted } } #endregion |