Append Values

Question

Hi, 
 I have a requirement to append the values of a particular computation to a local variable using append function 
 The rule goes like this : 
 a!localVariables( 
 local!data : {"x", "y", "z", }, 
 local!finalValues, 
 a!forEach( 
 items: local!data, 
 expression: append( 
 local!finalValues, 
 performSomeComputation(fv!item) 
 ) 
 ) 
 ) 
 
 now the problem is, the local variable is not getting updated no matter what, I tried using update dictionary as well as insert(local!finalValues, length(local!finalValues) + 1, fv!item) .. but still it wont append .. is there any other method I can use to append values ?

Mike Schmitt · Answer

You would need to define local!finalValues as the a!forEach() update sequence you try below. Expression code can't and doesn't "push" a value into an already-defined variable (the only exception being on a form where saves are executed via user interaction) - instead you need to build the update into your definitions. It can be a tricky paradigm to get used to, I admit, but once you get it, it's pretty easy to follow.

Amaan Shekh · Answer

try this-> a!localVariables(
 local!data: { "x", "y", "z", },
 local!finalValues: a!forEach(
 items: local!data,
 expression: concat("'", fv!item) /*some computation*/
 ),
 local!finalValues
)

Mike Schmitt · Answer

Also you would not need "append()" here - simply assemble your array. 
 a!localVariables(
 local!data: { "x", "y", "z", },
 local!finalValues: a!forEach(
 items: local!data,
 expression: performSomeComputation(fv!item)
 ),
 
 local!finalValues /* for the sake of output only */
)

Append Values

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