A lazy fibonacci example written in javascript

lazy_fib.js

function create_fibonacci(){
  var n1 = -1,
      n2 = 1,
      n = 0;
  return function(){
    n = n1 + n2;
    n1 = n2;
    n2 = n;
    return n;
  }
}

var fib = create_fibonacci();
for(var i = 0; i<=15; i++){
  console.log(fib());
}

def fibs():
    a,b=(0,1)
    while(true):
        a,b=(a+b,a) 
        yield a

for i in fibs().Take(15):
   print i