Making your own Javascript Iterator

Probably many Javascript developers first stumble upon Iterators when looking into the for…of loop. The for…of statement creates a loop and needs an iterable object in order to do so. So what are iterable objects in Javascript? Yeah you guessed it. Arrays is one. We also have some array-like objects such as arguments and NodeLists.

Probably many Javascript developers first stumble upon Iterators when looking into the for…of loop. The for…of statement creates a loop and needs an iterable object in order to do so.

So what are iterable objects in Javascript?

Yeah you guessed it. Arrays is one. We also have some array-like objects such as arguments and NodeLists. Maps, Sets and TypedArrays are also iterable objects. The last honorable mention is the String.

When we iterate these objects an iteration hook with statements are executed for the value of each distinct property of the object.

With this knowledge, could we add a custom iteration hook for a plain Javascript Object which is not iterable by default? A rhetorical question of course.

There is a default iterator available to us in Symbol.iterator.

Lets first see what happens if we remove that from a normal Array.

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