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PowerShell example using a hash table in a PSD1 and null coalescing to map colour name to value
$colourName = 'green'
$colourMap = Import-LocalizedData -FileName mapping.psd1
$colourValue = ($colourMap[$colourName], 0x0, 1 -ne $null)[0] # Null Coalescing
return $colourValue
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