Szathmáry László honlapja @ DEIK | Nim2 / Remove duplicates and keep order

Task: remove duplicates from a seq but keep the original order of the unique elements.

remove duplicates, keep the order
def remove_duplicates_keep_order(li): seen = set() result = [] for e in li: if e not in seen: result.append(e) seen.add(e) # # return result li = ["aa", "bbb", "aa", "cc", "bbb", "cc"] result = remove_duplicates_keep_order(li) print(result) # ['aa', 'bbb', 'cc']	import std/sets proc removeDuplicatesKeepOrder[T](li: seq[T]): seq[T] = var seen: HashSet[T] for e in li: if e notin seen: result.add(e) seen.incl(e) let li = @["aa", "bbb", "aa", "cc", "bbb", "cc"] result = removeDuplicatesKeepOrder(li) echo result # @["aa", "bbb", "cc"]

Note: I figured out later that this task can be solved easier by using the stdlib. See here.