How to get the indices of items in an array using Arcade

[pat_algura]

I have a hosted feature service with Attachments, and I want to create a list of indices of the attachments per feature. Ultimately, I want to get the position of each attachment per feature.

I used Array(Count(Attachments($feature)), which creates an array based on the number of attachment the feature has, but I'm stuck here. I'm new to Arcade and will appreciate any help!

[SzuNyiapTang]

Hi @pat_algura 

Attachments($feature) will gives you the dictionary of the attachments per feature.

You can then loop through the dictionary to get the id.

var attachments = Attachments($feature)
var txt = ""
for(var attach in attachments){
    txt += (attachments[attach].id) + ","
}
return txt

Cheers,

Tang

[pat_algura]

Thanks for responding @SzuNyiapTang 

This approach pulls the attachment ids though instead of indices.

For each element, I want it to show:

Attachment List

1,2,3,4,5

1,2,3,4

1,2,3,4

Thanks,

Patricia

[JohannesLindner · Accepted solution]

var attachments = Attachments($feature)
var txt = []
for(var a in attachments){
    Push(txt, a+1)
}
return Concatenate(txt, ", ")

What's your end goal here? Because I fear it's linking those indices to the attachments. If so, you're on the wrong track.

[pat_algura]

Thank you! This is exactly what I'm trying to achieve 😄

Cheers,

Patricia