is there any way of updating a variable just if a reference varible change and is not null ?

Question

foreach(items:local:lines,expresion:
local!searchsection:
 if(
 or(lower(left(trim(fv!item),7 ) ) = "section",
 regexmatch("\d{1,2}[.]\d{1,2}",
 left(trim(fv!item),5 )

 ))


 ,

 "Section: "& cleanwith(left(trim(fv!item),12 ), "1234567890.")
 
 ,{})

 ,
 local!section:a!refreshVariable(


 value: local!searchsection

 ,refreshOnReferencedVarChange:
 if(
 rule!NPA_isEmpty(local!searchsection),
 false(),
 true()
 )
 ),
 local!section
 ) 
 I'm trying to modify the second variable just if the first variable that i have is not null but if it is null i need to keep the last value the variable had

felixr · Accepted Answer

Hi thanks for helping me today i found a work around to do this with a process model 
 just making another list and looping this way cause if i try to loop by the config in multiple instances of this node the variable don't update correctly. but looping with a xor till we get to the limit we can update the variable each time with no problem. 
 it was about generating a file searching for some key phrases and displaying in which section it was found.

agam · Answer

Hi felixr 
 If you are trying to get the Section numbers per line, this is something you can try. 
 I assumed how your data would look like. 
 Let me know if the data looks different and we could come up with something to help you. Thanks 
 a!localVariables(
 /*My assumption of your data*/
 local!data: " 
Hello
Section: 1.2
Welcome to Appian
Lets start
Section: 2.3
Contents
Expression Rules

Section: 2.8
Process Models",
 /*Split data by new line character to get line*/
 local!lines: split(a!defaultValue(local!data, {}), char(10)),
 /*Get the line numbers which has the word Section in it*/
 local!sectionLineIndexes: where(find("Section:", local!lines)),
 /*Retrieve section names*/
 local!sectionNames: a!forEach(
 items: local!sectionLineIndexes,
 expression: cleanwith(
 left(trim(index(local!lines, fv!item)), 12),
 "1234567890."
 )
 ),
 /*Transform sectionLineIndexes array to return an array of number 
 of lines which points to index of its section's name */
 local!index: a!flatten(
 a!forEach(
 items: local!sectionLineIndexes,
 expression: {
 if(
 fv!isFirst,
 repeat(fv!item - 1, 0),
 repeat(
 fv!item - index(local!sectionLineIndexes, fv!index - 1, 0),
 fv!index - 1
 )
 ),
 if(
 fv!isLast,
 repeat(
 count(local!lines) - fv!item + 1,
 fv!itemCount
 ),
 {}
 )
 }
 )
 ),
 /*Section Names per line - defaults NA, until Section word is found*/
 local!sectionPerLine: a!forEach(
 items: local!index,
 expression: if(
 fv!item = 0,
 "NA",
 index(local!sectionNames, fv!item, "")
 )
 ),
 /*Output - for display purposes*/
 a!forEach(
 items: local!lines,
 expression: concat(
 "Line ",
 text(fv!index, "00"),
 " | Section ",
 a!defaultValue(
 index(local!sectionPerLine, fv!index, ""),
 "NA"
 ),
 ": ",
 fv!item
 )
 )
)

Hope it helps !

is there any way of updating a variable just if a reference varible change and is not null ?

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