adding numbers present in array without using sum function

Question

can some one tell me on how to create an expression rule to add an array of numbers without suing sum function

Chris · Answer

Agree, sum() function should be your go-to for "summing" an array. 
 But if you are looking to unnecessarily complicate your code, how about a recursive function to add an array of numbers. 
 Note with recursive rules, you must save them prior to testing. 
 /* 
rule!chris_add_recur(
 array: List of Integer
 index: Integer
 total: Integer
)
*/

a!localVariables(
 local!index: if(rule!APN_isEmpty(ri!index),1,ri!index),
 local!total: if(rule!APN_isEmpty(ri!total),0,ri!total),
 
 if(
 local!index>count(ri!array),
 ri!total,
 rule!chris_add_recur(
 array: ri!array,
 index: local!index+1,
 total: index(ri!array,local!index)+local!total
 )
 )
) 
 Call this rule with only the array input as: 
 rule!chris_add_recur(
 array: {1,2,3,4}
)

adding numbers present in array without using sum function

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