PowerShellPerformance/What_Is_The_Fastest_Way_To_Filter.benchmark.ps1
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#requires -Module Benchpress $valueList = 1..10000 $linqWhere = [Func[object,bool]]{param($_) $_ -gt 1000} $whereGt1000 = { $_ -gt 1000 } Measure-Benchmark -GroupName "Filtering Values" -RepeatCount 10 -Technique @{ "ForEach Loop" = { foreach ($v in $valueList) { if ($v -gt 1000) { $v } } } "Where-Object Script (Positional)" = { $valueList | Where-Object $whereGt1000 } "Pipe to ScriptBlock" = { $valueList | & { process { if ($_ -gt 1000) { $_ } } } } "Operator Filter (Assumed Array)" = { # VERY DANGEROUS if $valueList isn't already typed as an array, it will # return $true/$false instead of acting as a filter on single objects $valueList -gt 1000 } "Operator Filter (Explicit Array)" = { # Safe for arrays or single values @($valueList) -gt 1000 } ".Where Method" = { $valueList.Where({$_ -gt 1000}) } "Linq.Enumerable::Where" = { [System.Linq.Enumerable]::Where($valueList, $linqWhere) } } $objectList = foreach ($v in 1..100000) { [pscustomobject]@{Value=$v} } Measure-Benchmark -GroupName "Filtering by Property Values" -RepeatCount 10 -Technique @{ "ForEach Loop" = { foreach ($o in $objectList) { if ($o.Value -gt 1000) { $o } } } "Where-Object Property (Positional)" = { $objectList | Where-Object Value -GT 1000 } "Pipe to ScriptBlock" = { $objectList | & { process { if ($_.Value -gt 1000) { $_ } } } } ".Where Method" = { $objectList.Where({$_.Value -gt 1000}) } } $IsOdd = { process { if ($_ % 2) { $_ } } } filter IsOdd { if ($_ % 2) { $_ } } Measure-Benchmark -GroupName 'Filtering a Pipeline' -Technique @{ "InlineScriptBlock" = { 1..10 | & { process { if ($_ % 2) { $_ } } } } ScriptBlockVariable = { 1..10 | & $IsOdd } 'DotInline' = { 1..10 | . { process { if ($_ % 2) { $_ } } } } 'DotScriptBlockVariable' = { 1..10 | . $IsOdd } Filter = { 1..10 | isOdd } WhereObject = { 1..10 | ? $IsOdd } } |