User Guide : Using Content Extraction Language : Language Syntax and Examples : in
 
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in
This is the array membership operator. It is used in the "for loop" to loop through all of the elements in an array.
Example
For (x in myarray) # loops through each of the elements in myarray
Total = myarray[x].cost;
if (j in arr) # determines if arr[j] exists
total += arr[j];