functions/Merge-Hashtables.ps1
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# <copyright file="Merge-Hashtables.ps1" company="Endjin Limited"> # Copyright (c) Endjin Limited. All rights reserved. # </copyright> <# .SYNOPSIS Merges the keys from 2 or more hashtables into a single hashtable. .DESCRIPTION Merges keys from 2 or more hashtables. The hashtable provided via the pipeline will be treated with the lowest priority in the event of duplicate key names. Where multiple hashtables are provided in the arguments, the last specified hashtable will have the highest priority in the event of duplicate key names. .INPUTS Hashtable .OUTPUTS Hashtable .EXAMPLE @{Foo='bar'} | Merge-Hashtables @{Bar='foo'} @{Foo='bar'} | Merge-Hashtables @{Bar='foo'} @{FooBar='foobar'; Foo='not-foo'} #> #SUPPRESS-ParameterChecks function Merge-Hashtables { $output = @{} # process input [hashtable[]] $hashtables = @() if ($Input) { $hashtables += $Input } foreach ($h in $args) { $hashtables += $h } # perform merge foreach ($hashtable in $hashtables) { if ($hashtable -is [Hashtable]) { foreach ($key in $hashtable.Keys) { $output.$key = $hashtable.$key } } } $output } |