Iterator: protocol
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the iteratorFunction needs to comply to the iterator protocol
- must return an object
- the object must have a function assigned to a key
next
- calling
next() must return an object with {done: true}
the iterable
- must be an object
- must have the iterator function assigned to the key
Symbol.iterator
using the iterable
- it contains no values
- has no
.length property
can be converted to an array
- using
Array.from()
- where
.length is still 0