Fibonaci and factorial iterators on JavaScript

fib-fact-iterator.js

var Fib = {
	[Symbol.iterator]() {
		var n1 = 1, n2 = 1;

		return {
			// make the iterator an iterable
			[Symbol.iterator]() { return this; },

			next() {
				var current = n2;
				n2 = n1;
				n1 = n1 + current;
				return { value: current, done: false };
			},

			return(v) {
				console.log(
					"Fibonacci sequence abandoned."
				);
				return { value: v, done: true };
			}
		};
	}
};

var Fact = {
  [Symbol.iterator]() {
    var n1 = 1, n2 = 1;
    
    return {
      [Symbol.iterator]() { return this; },
      
      next() {
        var current = n1;
        n2 += 1;
		n1 = n2 * current;
        
        return { value: current, done: false };
      },
      
      return(v) {
				console.log(
					"Factorial sequence abandoned."
				);
				return { value: v, done: true };
			}
    };
  }
};

for (var v of Fact) {
	console.log( v );

	if (v > 10000) break;
}