Arcade syntax - When() and &&

[Lindsay]

Hi there, Not sure the best place to post this. Just need a fresh set of eyes. Still new to Arcade and want to get a calculated expression going in my form in MapViewer.

Have I set this up right? I'm not getting an output.

var A = $feature.A
var B = $feature["B_B"]

var PA_EF = When(
A=='010417192124' && B == 'Pre2000s', 2.3, 22222)

return PA_EF

The first set of numbers there is a concatenated string. That's why I've put ''.

Also, this ultimately outputs into a double field. The default answer (22222), does that have to be a number or can I put 'No value'?

[JohannesLindner · Accepted solution]

The When() function is set up correctly. If you don't get output, try these:

• Make sure you actually included the expression in your form
• Make sure your field names are correct and that you use the actual names, not the aliases
• try using 22222.0 (a double) as default value
• try the written-out version of When():

var A = $feature.A
var B = $feature["B_B"]

if(A=='010417192124' && B == 'Pre2000s') {
    return 2.3
}
return 22222

does that have to be a number or can I put 'No value'?

It has to be a number. So either a default value like your 22222 (or the more common 99999) or you could return null, which leaves the field empty.

[Lindsay]

Thanks @JohannesLindner . This was really helpful. I think I've been having issues because Map Viewer is slow/not always implementing the expression at the moment due to the upgrade and what I shared was a simplified/shorter version.