Page 66 - Nodejs 교과서 개정2판

.then((user) => {
user.name = 'zero';
return user.save();
})
.then((user) => {
return Users.findOne({ gender: 'm' });
})
.then((user) => {
// 생략
})
.catch(err => {
console.error(err);
});
}

௏٘੄ Ө੉о ࣁ ױ҅ ੉࢚ Өয૑૑ ঋणפ׮ ਤ ௏٘ীࢲ then ݫࢲٜ٘਷ ࣽର੸ਵ۽ प೯ؾפ׮ ௒ߔীࢲ
ݒߣ ٮ۽ ୊ܻ೧ঠ ೮؍ ী۞ب ݃૑݄ catchীࢲ ೠ ߣী ୊ܻೡ ࣻ ੓णפ׮ ೞ૑݅ ݽٚ ௒ߔ ೣࣻܳ ਤ৬

э੉ ߄Ե ࣻ ੓ח Ѫ਷ ইתפ׮ ݫࢲ٘о ೐۽޷झ ߑधਸ ૑ਗ೧ঠ ೤פ׮

৘ઁ੄ ௏٘ח findOneҗ save ݫࢲ٘о ղࠗ੸ਵ۽ ೐۽޷झ ё୓ܳ о૑Ҋ ੓׮Ҋ о੿೮ӝী оמ೤פ׮ ne

w Promiseо ೣࣻ ղࠗী ҳഅغয ੓যঠ ೤פ׮ ૑ਗೞ૑ ঋח ҃਋ ௒ߔ ೣࣻܳ ೐۽޷झ۽ ߄Ե ࣻ ੓ח
ߑߨ਷ ੺ী ա৬ ੓णפ׮

೐۽޷झ ৈ۞ ѐܳ ೠ ߣী प೯ೡ ࣻ ੓ח ߑߨ੉ ੓णפ׮ ӝઓ੄ ௒ߔ ಁఢ੉঻׮ݶ ௒ߔਸ ৈ۞ ߣ ઺୏೧
ࢲ ࢎਊ೧ঠ ೮ਸ Ѫੑפ׮ ೞ૑݅ Promise.allਸ ഝਊೞݶ рױ൤ ೡ ࣻ ੓णפ׮

const promise1 = Promise.resolve('성공1');
const promise2 = Promise.resolve('성공2');
Promise.all([promise1, promise2])
.then((result) => {
console.log(result); // ['성공1', '성공2'];
})
.catch((error) => {
console.error(error);
});

1SPNJTF SFTPMWFח ૊द resolveೞח ೐۽޷झܳ ݅٘ח ߑߨੑפ׮ ࠺तೠ Ѫਵ۽ ૊द rejectೞח Promise

.rejectب ੓णפ׮ ೐۽޷झо ৈ۞ ѐ ੓ਸ ٸ Promise.allী ֍ਵݶ ݽف resolveؼ ٸө૑ ӝ׮۷׮о th

enਵ۽ ֈযцפ׮ result ݒѐ߸ࣻী пп੄ ೐۽޷झ ѾҞч੉ ߓৌ۽ ٜয ੓णפ׮ Promise ઺ ೞաۄب
rejectо غݶ catch۽ ֈযцפ׮