Return the description of a domain instead of the code for Arcade Popup

[Calley]

The goal of this code is to find the top 3 most planted trees in each polygon and rank them in a popup. The code below accomplishes that, but it returns the code of the domain and not the description. 

For example, I want the list to look like this "1. Maple 2. Oak 3. Hickory", but arcade returns this instead"1. AC 2.QU 3. CA". 

I have attempted to use DomainName to return the description, but I am having difficulty.  When I run the code below in an attempt to return the description, nothing is returned.  Please help me return the description and not the code for this feature class.

var trees = FeatureSetByName($map, "Trees - Trees")

var countspecies = Intersects(trees, $feature)

var stats = Groupby(countspecies, "commonname",[
  {name: "total" ,expression: "commonname", statistic: 'COUNT'}
  ])

var topspecies = Top(OrderBy(Filter(stats, "commonname <> ''"), "total desc"), 3)


var result = 'The top species in this tract are:'

var num = 0

for (var item in topspecies){
  num++
  var num_species = item["total"]
  var species_name = DomainName(item,FeatureSetByName($map, "Trees - Trees"), "commonname")

  result += TextFormatting.NewLine + num + ". " + " " + species_name + " " + num_species + " " + "planted"
}

return result

[KenBuja · Accepted solution]

What you have to do is get the domain's codedValue array and for each item, loop through that array to get the correct domain name.

This should work

var trees = FeatureSetByName($map, "Trees - Trees");

var countspecies = Intersects(trees, $feature);

var stats = Groupby(countspecies, "commonname",[
  {name: "total" ,expression: "commonname", statistic: 'COUNT'}
  ]);

var topspecies = Top(OrderBy(Filter(stats, "commonname <> ''"), "total desc"), 3);


var result = 'The top species in this tract are:';

var num = 0;
var codedValues = Domain(trees, 'commonname').codedValues;
for (var item in topspecies){
  num++;
  var num_species = item["total"];
  var species_name;
  for (var i in codedValues){
    if (codedValues[i].code == item['commonname']) species_name = codedValues[i].name;
  }

  result += TextFormatting.NewLine + num + ". " + " " + species_name + " " + num_species + " " + "planted";
}

return result

[Calley]

This is great, thank you so much for your help!!