how to increment local variable in for each in expression rule

Question

how can i set counter value after each iteration in forEach funtionin eg set counter = counter +1 or counter = 1 based on condition 
 Let just say 
 I have 2 CDT 
 itemA:{1,2,3} 
 itemB{c,d,e,f,g,h} 
 and i have to generate resultant CDT itemZ: [{ guid:c, ac:1} , { guid:d, ac:2} ,{ guid:e, ac:3} , { guid:f, ac:1} ,{ guid:g, ac:2} ,{ guid:h, ac:3} ] 
 In my expression rule I am iterating itemB using foreach function 
 
 local!counter:0, 
 local!ItemZ :foreach( 
 items:itemB 
 expression :a!localVariable( 
 local!:counter: if(length(ItemA)>= local!counter, local!:counter +1, 1 ), 
 if( length(ItemA)>= local!counter, 
 { 
 type!ItemZ 
 ( 
 guid:fv!item, 
 ac:ItemA[counter] 
 ) 
 }, 
 /*else case */ 
 {} 
 ) 
 ) 
 ) 
 ) 
 Issue is: every iteration counter is set to 0 instead of previous value of counter.

Harshit Bumb (Appyzie) · Accepted Answer

No. You cannot do this. A local or any variable can only be updated inside a component's "SaveInto" ONLY. As we aren't using any interface component here, we won't be able to that.

Harshit Bumb (Appyzie) · Answer

Hi sugasanr0001 I think this code snippet will work fine for you as this generates the required Z CDT. a!localVariables(
 local!a: {1,2,3},
 local!b: {"c","d","e","f","g","h"},
 local!sizeOfA: count(local!a),
 a!forEach(
 items: local!b,
 expression: {
 guide: fv!item,
 ac: local!a[
 if(
 fv!index<=local!sizeOfA,
 fv!index,
 fv!index-((ceiling(fv!index/local!sizeOfA)-1)*local!sizeOfA)
 )
 ]
 }
 )
) Thanks, Harshit

how to increment local variable in for each in expression rule

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