[ nodejs ] callback v.s. promise

// Get a particular user
exports.get = function(id, callback) {
db.fetch({id:id}, function(errors, docs) {
if (errors) return callback(errors);
callback(null, docs[0]);
})
}
//Get a particular user
exports.get = function(id) {
return new Promise((resolve, reject)=>{
db.fetch({id:id}, function(errors, docs) {
if (errors)
return reject(errors);
return resolve(docs[0]);
})
});
}
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