Define variable later

Question

Hello! 
 I have a problem of following type: 
 a!localVariables(
 local!emptyArray: {},
 ...
 {
 ...
 a!forEach(
 ...
 a!localVariables(
 local!variableWhichChangesWithEveryIteration:{...},
 {
 /* Here I want to append the local variable's value to my empty array. Something like this: */
 a!save(local!emptyArray, append(local!emptyArray, local!variableWhichChangesWithEveryIteration))
 }
 )
 )
 /* my array will be used here */
 }
) 
 The problem is that value of the array won't refresh by itself (if I use saveInto in a textField, for example) and I don't know how to do it automatically...

Mike Schmitt · Accepted Answer

The trick is, in Appian, if your value isn't being supplied by user interaction, then there's no reason you can't just declare the variable that way up-front. There's no need (and also no way) to declare a blank variable then have some subsequent function call change it for you. That's because you can just declare it that way from the start. 
 a!localVariables(
 local!array: a!forEach(
 ...,
 "value that changes with each iteration"
 ),
 ...
)

Stefan Helzle · Answer

The Appian expression language is a functional language with immutable variables. Check out this: docs.appian.com/.../Expressions.html

Define variable later

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