thunkify&co&yield sample

s.js

var co = require('co');
var thunkify = require('thunkify');

function f1(callback){
  callback(0, 1);
}

var n = thunkify(f1);
co(function* (){
  var out = yield n();
  //console.log(out);
  return 2;
}).catch(function(err){
  console.log('error');
})
.then(function(data){
  console.log(data);
})