I followed a javascript tutorial, in this video it applies the promise function, in my case I am waiting to retrieve it from the products table but it gives me undefined.
getUser(10)
.then((user) => {
console.log(user);
getProducts(user.id);
})
.then(products => console.log(products))
.catch((err) => console.warn(err))
function getUser(id){
return new Promise((resolve,reject) => {
let status = true;
setTimeout(() => {
console.log('return data');
if(status){
return resolve({ id:id, name: 'najib' })
}else{
return reject("user not found")
}
}, 2000)
})
}
function getProducts(userId){
return new Promise((resolve,reject) => {
let status = true;
setTimeout(() => {
console.log('return product data');
if(status){
return resolve(['p1','p2','p3','p4'])
}else{
return reject("products not found")
}
}, 2000)
})
}>Solution :
you miss a return after console.log(user)
getUser(10)
.then((user) => {
console.log(user);
return getProducts(user.id);
})
.then(products => console.log(products))
.catch((err) => console.warn(err))
function getUser(id){
return new Promise((resolve,reject) => {
let status = true;
setTimeout(() => {
console.log('return data');
if(status){
return resolve({ id:id, name: 'najib' })
}else{
return reject("user not found")
}
}, 2000)
})
}
function getProducts(userId){
return new Promise((resolve,reject) => {
let status = true;
setTimeout(() => {
console.log('return product data');
if(status){
return resolve(['p1','p2','p3','p4'])
}else{
return reject("products not found")
}
}, 2000)
})
}