Gen.js Example

gistfile1.js

// Source generator for fibonacci sequence
function fibonacci() {
    var c = 0, d = 1;
    return function(y, b) {
        var next = c;
        c = d;
        d = next + d;
        return y(next);
    };
}

var f = gen(fibonacci())
    .sync();
f(); -> 0
f(); -> 1
f(); -> 1
f(); -> 2
f(); -> 3
f(); -> 5
...

// Operations can also be applied to generators:
// Square each Fibonacci number.
var f = gen(fibonacci())
    .map(function(v){ return v * v;})
    .sync();
f(); -> 0
f(); -> 1
f(); -> 1
f(); -> 4
f(); -> 9
f(); -> 25
....