What is a Set

Set Conversion

Creating a set from an array would be a O(n) operation.

Creating an array (list) from set would also be a O(n) operation.

Javascript

Python

newList = {"one", "two", "three"}
newSet = set(newList)

Nested iteration

# creating set from list (array)
my_list = [[2, 4], [2, 6], [2, 8]]
my_set = {e for l in my_list for e in l}