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Arcade: Can you reference an existing expression in another expression?

RobBlash

Let's say I have {expression/expr0} written, and I want to write a new expression to use the same output but scrubbed a different way. Can I reference $feature.{expression/expr0}? That syntax doesnt work, but hopefully this is possible and I'm doing it wrong?

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Anonymous User

Hi Rob,

You can reference existing expressions in the Existing tab of the expression authoring window:

Hope that helps,

-Peter

NicholeSalinger

Hey Peter Klingman‌ - is there a way to just embed the name of the expression? I'm pretty new at using Arcade Expressions and the online documentation doesn't reference how to embed expressions in another expression.Thank you!

Anonymous User

Hi Nichole, it is not currently possible to reference the expression by name. You would need to select the existing expression from the right hand menu, and this will insert it into the expression that is currently being authored. For all intents and purposes it is the same as reusing the expression by name, albeit makes the script longer. Hope this helps!

-Peter

NicholeSalinger

Hey Peter - I ended up figuring out the expression because the embedded code would not cooperate using the method you described. Thanks though!

KeithBurdette1

You say that "For all intents and purposes it is the same as using the expression by name"

I'm using arcade to reference a related table to return a few attributes. By retyping the code instead of referencing an earlier expression, that means I need to do a separate function call for FeatureSetByName and Filter for each different attribute I want to return. For ten attributes, that means ten different returns of my entire dataset which isn't very fast. If I could reference earlier expressions, I could set one of them to the returned featureset that has been filtered and not need to make a new featureset for each attribute. Is storing a featureset in an expression a possibility in arcade?

KeithBurdette1

Thanks for the reply Peter!

Ultimately, if I want to display all the attributes returned by a FeatureSet, don't I need to have an expression for each individual attribute? Or by chain, do you mean a string that displays all the attributes I want that I could then put in a pop-up?

Anonymous User

Hi @KeithBurdette1 - By chain I meant use Filter and FeatureSet in the same call to reduce round trips to the server. But you're spot on - to return multiple attributes from the related records, what you can do is create an empty string, loop through the featureSet, and add records to the string. Here is a quick example of both:

var globalId = $feature.GlobalID;
var fset = Filter(FeatureSetByName($map,"RelatedFeatures"), 'RELATEFIELD = @globalId');
var returnString = "";
for (var f in fset) {
    returnString += "Related Record # " + f.NUMBER_RELATED
    returnString += TextFormatting.NewLine
    returnString += f.TEXT_RELATED
    returnString += TextFormatting.NewLine
    returnString += "-----------------"
    returnString += TextFormatting.NewLine
}

return returnString

Returns:

Thanks,

-Peter

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