var myIterableObject = {};
// An Iterable object must define a method located at the Symbol.iterator key:
myIterableObject[Symbol.iterator] = function () {
// The iterator should return an Iterator object
return {
// The Iterator object must implement a method, next()
next: function () {
// next must itself return an IteratorResult object
if (!this.iterated) {
this.iterated = true;
// The IteratorResult object has two properties
return {
// whether the iteration is complete, and
done: false,
// the value of the current iteration
value: 'One'
};
}
return {
// When iteration is complete, just the done property is needed
done: true
};
},
iterated: false
};
};
for (var c of myIterableObject) {
console.log(c);
}Console output
One