Sets

Set is an abstract data type

that can store certain values
- without any particular order
- and no repeated values

It is a computer implementation of the mathematical concept of a finite set.

In mathematics (particularly set theory)
- a finite set is a set that has a finite number of elements.
(informally) a finite set is a set which one could in principle count and finish counting.

Go does not have Sets by default but there are ways of imitating a Set in Go.