Iterate the iteratable object from the iterator object, Javascript - rextester

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Iterate the iteratable object from the iterator object

function range(min, max) {
            return { // Return an object representing a range.
                get min() { return min; }, // The range's bounds are immutable.
                get max() { return max; }, // and stored in the closure.
                includes: function (x) { // Ranges can test for membership.
                    return min <= x && x <= max;
                },
                toString: function () { // Ranges have a string representation.
                    return "[" + min + "," + max + "]";
                },
                __iterator__: function () { // The integers in a range are iterable.
                    let val = Math.ceil(min); // Store current position in closure.
                    return { // Return an iterator object.
                        next: function () { // Return next integer in the range.
                            if (val > max) // If we're past the end then stop.
                                throw StopIteration;
                            return val++; // Otherwise return next and increment.
                        }
                    };
                }
            };
        }
        // Here's how we can iterate over a range:
        //debugger;
        for (let i in range(1, 10))
            print(i); // Prints numbers from 1 to 10


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