topic Re: Arcade expression in ArcGIS Pro Questions

Arcade expression

SLouq — Mon, 27 Mar 2023 20:06:17 GMT

How can I write this Code Block as an Arcade expression

Re: Arcade expression

jcarlson — Mon, 27 Mar 2023 20:12:31 GMT

https://developers.arcgis.com/arcade/ has all kinds of resources. Your question isn't very specific, though. Is there a particular part you're having trouble with?

Arcade follows many of the conventions of JavaScript, so familiarity with that will help.

// defining a function function myExpression(some_param) { // do something here return 'some value' } // an if-else block If (some_condition) { // do something } else if (another condition) { // do something else } else { // do this if nothing else worked }

Re: Arcade expression

SLouq — Mon, 27 Mar 2023 20:17:41 GMT

I know just enough coding to stumble my way through an expression in VB. I have never used Arcade. I will try your link and see if I can find something.

Thanks

Re: Arcade expression

SLouq — Tue, 28 Mar 2023 14:18:44 GMT

Hi,

I tried looking for a solution in the link you provided but wasn't successful. What I am trying to do is write a simple Arcade expression to find all streets in my map with a Street type of Farm and return a value of "No" but if Street type is not = to Farm then return a value of "Yes".

This is all I can come up with but it doesn't verify

Can you help me with this?

Re: Arcade expression

DanielMiranda2 — Tue, 28 Mar 2023 17:54:36 GMT

You are missing a couple of curly brackets. Each return statement needs to be enclosed by curly brackets. Also, you need to use a double equals sign when checking if something is equal to a value. A single equals sign is used for assigning variables.

if($feature.MAJOR_ST == 'Farm'){ return "No" } else { return "Yes" }

Refer to If - else | ArcGIS Arcade | ArcGIS Developers for info on if-else syntax.

Refer to Operators | ArcGIS Arcade | ArcGIS Developers for operators, which discusses = vs ==.

For straight forward if-else statements, arcade also has an IIF function, which can be a little easier to create:

IIF($feature.MAJOR_ST == "Farm", "No", "Yes")

Logical functions | ArcGIS Arcade | ArcGIS Developers

Re: Arcade expression

SLouq — Tue, 28 Mar 2023 18:02:16 GMT

That worked!

Thank you so much!