Arcade Expression: show 2 variable ranges, hide 3rd

JohnBranum

Hello -

I can't see why this expression for a temperature layer won't work.  It's addressing a Field ("$feature.TmaxC") listing temperature attributes in 5-degree increments from -50 degrees to 30 degrees.

var Cold = ($feature.TmaxC < 10)

var Freeze = iif(Cold < 5, "Freezing", "Near Freezing")

return Freeze

My goal is to limit what's shown to freezing polygons surrounded by near-freezing polygons, and hide any temperatures greater than 10(or 9.9) degrees.  What I THINK it's saying is:

"Cold" is only everything in $feature.TmaxC that's below 10 degrees.

"Freeze" is everything in Cold that's less than 5 degrees (so, 0 on down to -50), and we'll call that "Freezing".

What's left (anywhere it's 5 degrees) is called "Near Freezing".

Now show me the two categories of Freeze.

The result in my map is that the entire planet is one category - freezing.

Thanks for any help!

DavidPike

Proper noob on the Arcade language, 

but the When function might be appropriate:

Logical Functions | ArcGIS for Developers 

var temp = $feature.TmaxC
var ranking = When (temp < 5, “Freezing”,
temp >= 5 && temp < 10, “Near Freezing”,
“”)

return ranking

I can't test this myself at the moment, but it might give a good steer even if it needs finessing.