var promisify = (fn, ctx, ...args) => {

//console.log('first arguement is: '+ fn);

console.log('second arguement is: '+ ctx);

console.log('third arguement is: '+ args);

if (!ctx) {

console.log("not ctxxxx");

ctx = fn;

}

return new Promise((resolve, reject) => {

console.log('reject is: '+ reject)

console.log('resolve is: '+ resolve)

args.push((err, data) => {

if (err) {

console.log('err is: '+ err)

reject(err);

}

else {

console.log('data is: '+ data)

resolve(data);

}

});

console.log('args is: '+ args)

console.log('ctx is: '+ ctx)

fn.apply(ctx, args)

});

};

module.exports = {

promisify

};