In order to be iterable, an object must implement the @@iterator method. This means that the object (or one of the objects up its prototype chain) must have a property with a Symbol.iterator key.
If you want to create your own iterable object here is how you can do it.
const iterable = { *[Symbol.iterator]() { yield 1; yield 2; yield 3; } } for (let value of iterable) { console.log(value); } // 1 // 2 // 3 
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