Functions/Internal/Compare-Hashtable.ps1
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<# Source: https://gist.github.com/dbroeglin/c6ce3e4639979fa250cf #> $ErrorActionPreference = "Stop" function Compare-Hashtable { <# .SYNOPSIS Compare two Hashtable and returns an array of differences. .DESCRIPTION The Compare-Hashtable function computes differences between two Hashtables. Results are returned as an array of objects with the properties: "key" (the name of the key that caused a difference), "side" (one of "<=", "!=" or "=>"), "lvalue" an "rvalue" (resp. the left and right value associated with the key). .PARAMETER left The left hand side Hashtable to compare. .PARAMETER right The right hand side Hashtable to compare. .EXAMPLE Returns a difference for ("3 <="), c (3 "!=" 4) and e ("=>" 5). Compare-Hashtable @{ a = 1; b = 2; c = 3 } @{ b = 2; c = 4; e = 5} .EXAMPLE Returns a difference for a ("3 <="), c (3 "!=" 4), e ("=>" 5) and g (6 "<="). $left = @{ a = 1; b = 2; c = 3; f = $Null; g = 6 } $right = @{ b = 2; c = 4; e = 5; f = $Null; g = $Null } Compare-Hashtable $left $right #> [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [Hashtable]$Left, [Parameter(Mandatory = $true)] [Hashtable]$Right ) function New-Result($Key, $LValue, $Side, $RValue) { New-Object -Type PSObject -Property @{ key = $Key lvalue = $LValue rvalue = $RValue side = $Side } } [Object[]]$Results = $Left.Keys | ForEach-Object { if ($Left.ContainsKey($_) -and !$Right.ContainsKey($_)) { New-Result -Key $_ -LValue $Left[$_] -Side "<=" -RValue $Null } else { $LValue, $RValue = $Left[$_], $Right[$_] if ($LValue -ne $RValue) { New-Result -Key $_ -LValue $LValue -Side "!=" -RValue $RValue } } } $Results += $Right.Keys | ForEach-Object { if (!$Left.ContainsKey($_) -and $Right.ContainsKey($_)) { New-Result -Key $_ -LValue $Null -Side "=>" -RValue $Right[$_] } } $Results } |