Node.js generators, inspired by Python

generators.js

// Generators in node.js

var Generator = function (fn) {
    this.results = [];
    this.continuations = [];
    this.yield = function (val) {
        this.results.push(val);
    };
    this.continue = function (fn) {
        this.continuations.push(fn);
    };
    this.next = function () {
        this.continuations.forEach(function (continuation) {
            continuation.call(this);
        }, this);
        if (this.results.length) {
            return this.results.pop(0);
        }
    };
    fn.call(this);
};

var count = new Generator(function () {
    var i = 0;
    this.continue(function () {
        i++;    
        this.yield(i);
    });
});

console.log('Counting from 1 to 10');
for (var i=0; i < 10; i++) {
    console.log(count.next());
}

var fib = new Generator(function () {
    var a = 1, b = 1;
    this.continue(function () {
        this.yield(a);
        var next = a + b;
        a = b;
        b = next;
    });
});

console.log('Fibonacci');
for (var i=0; i < 10; i++) {
    console.log(fib.next());
}

;; cool fibonacci bro
(map second (take 20 (iterate (fn [[p n]]
                                [n (+ p n)])
                              [0 1])))