FastLookup.psm1
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#requires -version 3 <# .SYNOPSIS Lookup a value in an array faster than Where-Object .DESCRIPTION Improve the speed of looking up a value in an array by creating a hashtable index. Good for looking up results in very large arrays or CSV files (e.g Import-Csv) .NOTES Version: 1.0 Author: Miles Gratz Creation Date: April 10, 2017 Purpose/Change: Initial script development .EXAMPLE $array = 1..10000000 $hashtable = New-FastLookup $array Measure-Command { $array | Where-Object { $_ -eq 199999 } } Days : 0 Hours : 0 Minutes : 0 Seconds : 9 Milliseconds : 714 Measure-Command { Get-FastLookup -Value 199999 -Array $array -Table $hashtable } Days : 0 Hours : 0 Minutes : 0 Seconds : 0 Milliseconds : 65 [NOTE] Performance test on Windows 10 x64 (i5-6200U, 8GB RAM, SSD) #> $Functions = @( Get-ChildItem -Path $PSScriptRoot\*.ps1 -ErrorAction SilentlyContinue ) foreach ($Function in $Functions) { Try { . $Function.FullName } Catch { Write-Error -Message "Failed to import function $($Function.FullName): $_" } } Export-ModuleMember -Alias 'FastLookup' Export-ModuleMember -Function $Functions.BaseName |