Iterators are objects that implement the Iterator protocol by having a next() method that returns an object with two properties: value and done. Arrays have a @@iterator method that implements the iterable protocol and allows them to be consumed by syntaxes expecting iterables, such as the spread syntax and for...of loops. Iterators allow you to iterate over an object, such as arrays, Map objects, and even strings.
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As the name already gives away, iterators allow you to iterate over an object (arrays are also objects).
To make the range object iterable (and thus let for..of work) we need to add a method to the object named Symbol.iterator (a special built-in symbol just for ...
220.127.116.11 How to iterate over properties # The proper (and safe) way to iterate over properties is via a tool function. For example, via objectEntries() , whose ...
21. Iterables and iterators