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Confused by all the promises


Confused by all the promises

By : user2950246
Date : November 17 2020, 11:52 AM
Any of those help If you want to chain then method to result of Company.allowed_times() call, allowed_times must return a promise object. Right not it returns undefined. The fix is simple, you just need to return myCompany.$promise.then(function() {...}):
code :
allowed_times: function () {
    return myCompany.$promise.then(function (data, status) {
        // ... unchanged
        return list;
    });
}


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A bit confused with q and promises in nodejs

A bit confused with q and promises in nodejs


By : user2167092
Date : March 29 2020, 07:55 AM
Does that help Assuming your modules don't already use promises you can do something like this:
code :
module.exports = function(app) { 
    // do some stuff with app
    return new Promise(function(resolve,reject){
        // when ready to resolve after some actions on app
        resolve(); // you can also return a value here as a cb param
    });
};

Promise.all(["./setup/a","./setup/b","./setup/c"].map(require.bind(null,app)))
  .then(startApp);
module.exports = function(app){
     return something(app).then(function(){
         return somethingElseAsyncWithApp(app);
     });
};
Confused about promises. Do I need to return here?

Confused about promises. Do I need to return here?


By : Sarthak Nijhawan
Date : March 29 2020, 07:55 AM
hope this fix your issue Passport does not support Promise that is why you must call done in a callback. You could return users.get(username)but the return value (promise) is never used. Do not forget that you can chain promises like the following :
code :
users.get(username)
    .then(function(user) {
        if (!user) {
            return done(null, false, { message: 'Incorrect username.' });
        }
        return bcrypt.compare(password, user.password);
   })
   .then(function(result) { // B
        if (result) {
            return done(null, user);
        }
        return done(null, false, { message: 'Incorrect password.' });
    })
    .catch(function(err) {
        return done(err);
    });
Confused with promises in a loop

Confused with promises in a loop


By : Lin
Date : March 29 2020, 07:55 AM
I wish this helpful for you Using return inside for breaks the loop. You should gather promises from inner scan into array and use Promise.all to resolve then together
code :
dynamodb.scan(params).promise().then(function (data) {
    data.Items.forEach(function (itemData) {
        array.push(itemData.ruleNo)
    });
    console.log(array);
    return array;
}).then(() => {
    console.log("Entered 2nd block " + [...new Set(array)]);
    var array2 = [...new Set(array)];
    var results = []; //results array
    for (index = 0; index < array2.length; ++index) {
        console.log(array2[index]);
        var params1 = {
            TableName: "ChemicalData",
            FilterExpression: "#target_state = :target_state and #ruleNo=:ruleNo",
            ExpressionAttributeNames: {
                "#target_state": "target_state",
                "#ruleNo": "ruleNo"
            },
            ExpressionAttributeValues: {
                ":target_state": "5",
                ":ruleNo": array2[index]
            }
        };

        // push results to be resolved later
        results.push(dynamodb.scan(params1).promise().then(function (data) {
            var uw = JSON.stringify((data.Items));
            return uw;
        }));
    }
    // return promise that resolves when all results resolve
    return Promise.all(results);
})
Confused about promises

Confused about promises


By : Ankit Gupta
Date : March 29 2020, 07:55 AM
Any of those help I've got the following code, and I cannot understand why it doesn't do what I want. as a newbie both in JS and in jQuery, I'm confused with: , There are couple of errors in your code,
code :
var f1 = new Promise(function(resolve, reject) {
  resolve(prn('1<br><br>'));
  reject('err');
});
var test = function (){
  Promise.resolve().then(f1)
    .then(f2)
    .then(f3)
    .then(final);
};

function prn(texto) {
 console.log(texto);
}

var f1 = function(){ return new Promise(function(resolve, reject) {
  resolve(prn('1<br><br>'));
})};

var f2 = function(){return new Promise(function(resolve, reject) {
  resolve(prn('2<br><br>'));
});}

var f3 = function(){return new Promise(function(resolve, reject) {
  setTimeout(function(){
    resolve(prn('3<br><br>'));
  }, 3000);
});}

var final = function(){return new Promise(function(resolve, reject) {
  resolve(prn('END<br><br>'));
});}
Confused about the Promises

Confused about the Promises


By : Aks_R2
Date : March 29 2020, 07:55 AM
will be helpful for those in need What does resolve actually do? ,
What does 'resolve' actually do ?
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