how to increment local variable in for each loop in appian expression rule?

Question

i written code : 
 with( local!prioritylist:{1,2,3,4,5,6,7,8,9,10}, local!missinglist{}:{}, local!newmissing, local!count:0, local!temp: a!forEach( items:local!prioritylist, expression: if(fv!item <ri!priority,if(rule!CRP_Checkdepartmentwisepriority(fv!item,ri!department)=0,append(local!missinglist{},fv!item),local!missinglist{}),local!missinglist{}), local!newmissing:if(count(local!missinglist{})>0,count(local!missinglist{}),local!newmissing) ), local!temp ) 
 
 i got the output like this: 
 
 List of Variant - 10 items

List of Variant - 0 items

List of Number (Integer) - 1 item

3 (Number (Integer))

List of Variant - 0 items

List of Variant - 0 items 
 
 Here i want sum of count of each list of this list . Answer should be 1 
 
 So, How to add the count of each list in one variable??

Mike Schmitt · Accepted Answer

I'm pretty confused as to what you're trying to do here, and/or what you expect the outcome to be. 
 You ask "how to increment a local variable in a for each loop" and the short answer is, really, "you don't", because that's not how the Appian expression language, or the a!forEach() function, work. 
 Also I'm confused by what you're doing with the local!newmissing variable that seems to be inside the a!forEach() expression section - this is not syntactically valid. And again I'm unclear what it's intended to accomplish. 
 The expected output of the a!forEach() function is an array. If, for example, you want the total result of the sum of all items in that array, you simply need to pass the result through the sum() function afterwards. Like, sum(local!temp) etc.

how to increment local variable in for each loop in appian expression rule?

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