Poor wording

Question

this sentence makes no sense:

"where iterable is an array"

Therefor, i don't understand it.

ES6 Map & Set

Answer 1

iterable are objects with numeric index.

array is one of iterable with array methods.

other iterables include NodeList, HTMLCollection, etc.

Answer 2

That sentence makes complete sense.
Syntax of making a set is new set([iterable]), so you have to pass an Array as iterable.

Like new set([10,20,30,40])