is-iterator

Returns true if an object is an iterator.

Remember that iterators are not the same thing as iterables! This module only checks for the former.

The ECMAScript standard defines an iterator to be an object with a next() method. To avoid false-positives from objects with next() methods, this module additionally checks to make sure that the iterator is an iterable that points to itself, since this is a characteristic of built-in iterators.

Installation

npm install is-iterator --save

Usage Example

const isIterator = require('is-iterator')

const array = [] // An array is an iterable, but not by itself an iterator

isIterator(array) // false
isIterator(array[Symbol.iterator]()) // true