You can use terraform distinct() to remove duplicate elements from a list. distinct() takes a list and returns a new list with any duplicate elements removed.
Syntax: distinct(list)
Example:
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## Open terraform console terraform console ## Remove duplicate values from a list distinct([1,2,2,3,4,5,5,5,6,7,8,9,9]) ## returns ## [ ## 1, ## 2, ## 3, ## 4, ## 5, ## 6, ## 7, ## 8, ## 9, ## ] |