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I might be misunderstanding what you're trying to do, but I think

$found_services = lookup('servicelist').values

would do the trick

so services_installed is really a fact $facts['service_installed'] with the above output. but what I am trying to do is loop through all the services_installed, and return the category of service it is, based on a defined servicelist in hieradata.

@rismoney What do you want to result to be? An array of service categories?

yes

Maybe something like

$found_services = $services_installed.reduce([]) | $acc,$service | {
   $mapped_services = $servicelist.filter | $service_category | {
      $service_category[0] =~ $service[0] }
   $acc + pick_default($mapped_services.values[0],[])
   }

Though one thing to be aware of is you could have multiple matches from the

servicelist

mapping, or potentially none. Haven't tested it so probably should treat more like pseudo-code...

ooh, with the way the data is structured, it's a good fit for the

in

operator's ability to match regexs to hash keys. https://www.puppet.com/docs/puppet/7/lang_expressions.html#lang_exp_comparison_operators-comparison-in So an optimization of my first example from above could be:

$servicelist = lookup('servicelist', Hash, {})

$service_categories = $facts['servicelist'.map |$svc_regex, $svc_category| {
  if Regexp($svc_regex) in $facts['services_installed'] {
    $svc_category
  }
}.unique.filter |$val| {$val =~ NotUndef}

But if I flip the iteration around a bit, I can simplify that down even more into just:

$service_categories = lookup('servicelist', Hash, {}).filter |$svc_regex, $_svc_category| {
  Regexp($svc_regex) in $facts['services_installed']
}.values.unique

will give it a try and report back