Develop Reference

How can i calculate the rating in the rating array and still return it as a response

This is the sample JSON response from the Backend, the rating is in ratings array and the value is rating, so I want to calculate the average rating for each course and still return it as a response to frontend,
I tried using Object.Assign() but is worked well when i am fetching just one course but when i am fetching all courses, it doesn't work.
please i need help
{
"message": "Fetched successfully",
"status": "Success",
"statusCode": 200,
"data": {
"items": [
{
"id": 210,
"courseUuid": "93b760a7-505e-41bf-b57e-d84ecf53255f",
"userId": 2,
"title": "Complete Angularzero to hero",
"imageUrl": "https://our-akademy-uploads.s3.eu-west-1.amazonaws.com/courses/1655654436946-f02118c8-e3e9-44e5-8913-48d4f45cd816.png",
"slugUrl": "Complete-Angularzero-to-hero-19-06-2022-93b760a7-505e-41bf-b57e-d84ecf53255f",
"amount": "50,600",
"averageRating": "11.5",
"createdAt": "2022-06-19T16:00:43.009Z",
"updatedAt": "2022-06-19T23:27:46.073Z",
"user": {
"id": 2,
"userUuid": "b1f8def8-aa1d-4a57-b743-174a6ee738ec",
"email": "jessika76#hotmail.com",
"nawisNumber": "NAWIS/2022/54682884"
},
"category": {
"id": 1,
"categoryUuid": "3a4def94-dd1a-451c-8f84-476096203710",
"name": "Front-End Development",
"slugUrl": "Front-End-Development-18-06-2022-ec0a7634-b710-4723-b646-4cde33d3d15a"
},
"duration": {
"id": 23,
"durationUuid": "3500b0d0-8d98-46d6-80d8-6363c09e887c",
"duration": "5 Months"
},
"enrollments": [
{
"id": 1,
"paymentStatus": "Not Completed",
"createdAt": "2022-06-19T16:04:22.375Z",
"user": {
"id": 3,
"userUuid": "ad0b0ad4-368d-4f09-ae99-80d2bcaed3d6",
"email": "damion.jacobs84#yahoo.com",
"nawisNumber": "NAWIS/2022/12758991"
}
},
{
"id": 2,
"paymentStatus": "Not Completed",
"createdAt": "2022-06-19T16:07:37.059Z",
"user": {
"id": 6,
"userUuid": "cbfbc6a7-dfd7-4f74-a545-a1423ccdb0f3",
"email": "olaf_bailey#hotmail.com",
"nawisNumber": "NAWIS/2022/11177867"
}
}
],
"ratings": [
{
"id": 1,
"rating": 2,
"review": "some text here",
"createdAt": "2022-06-19T16:04:40.339Z",
"user": {
"id": 3,
"userUuid": "ad0b0ad4-368d-4f09-ae99-80d2bcaed3d6",
"email": "damion.jacobs84#yahoo.com"
}
},
{
"id": 2,
"rating": 5,
"review": "some text here",
"createdAt": "2022-06-19T16:07:23.798Z",
"user": {
"id": 6,
"userUuid": "cbfbc6a7-dfd7-4f74-a545-a1423ccdb0f3",
"email": "olaf_bailey#hotmail.com"
}
}
]
},
{
"id": 208,
"courseUuid": "16855bd6-dd18-420a-8611-bc77bbda818c",
"userId": 2,
"title": "Complete Vuejs zero to hero",
"imageUrl": "https://our-akademy-uploads.s3.eu-west-1.amazonaws.com/courses/1655653347091-cfee6022-0d3a-43e2-b780-986eda2607ed.png",
"slugUrl": "undefined-19-06-2022-16855bd6-dd18-420a-8611-bc77bbda818c",
"amount": "0",
"averageRating": "0",
"createdAt": "2022-06-19T15:42:30.273Z",
"updatedAt": "2022-06-19T15:53:07.726Z",
"user": {
"id": 2,
"userUuid": "b1f8def8-aa1d-4a57-b743-174a6ee738ec",
"email": "jessika76#hotmail.com",
"nawisNumber": "NAWIS/2022/54682884"
},
"category": {
"id": 1,
"categoryUuid": "3a4def94-dd1a-451c-8f84-476096203710",
"name": "Front-End Development",
"slugUrl": "Front-End-Development-18-06-2022-ec0a7634-b710-4723-b646-4cde33d3d15a"
},
"duration": {
"id": 23,
"durationUuid": "3500b0d0-8d98-46d6-80d8-6363c09e887c",
"duration": "5 Months"
},
"enrollments": [],
"ratings": []
},
{
"id": 207,
"courseUuid": "bdb3ee71-0c0b-41d8-9049-5fa6a2a230f3",
"userId": 2,
"title": "Complete Vuejs zero to hero",
"imageUrl": "https://our-akademy-uploads.s3.eu-west-1.amazonaws.com/courses/1655653325613-dda17c5c-2a4a-435a-99cb-ad28ea01bbb0.png",
"slugUrl": "Complete-Vuejs-zero-to-hero-19-06-2022-bdb3ee71-0c0b-41d8-9049-5fa6a2a230f3",
"amount": "50,600",
"averageRating": "0",
"createdAt": "2022-06-19T15:42:12.687Z",
"updatedAt": "2022-06-19T15:42:12.687Z",
"user": {
"id": 2,
"userUuid": "b1f8def8-aa1d-4a57-b743-174a6ee738ec",
"email": "jessika76#hotmail.com",
"nawisNumber": "NAWIS/2022/54682884"
},
"category": {
"id": 1,
"categoryUuid": "3a4def94-dd1a-451c-8f84-476096203710",
"name": "Front-End Development",
"slugUrl": "Front-End-Development-18-06-2022-ec0a7634-b710-4723-b646-4cde33d3d15a"
},
"duration": {
"id": 23,
"durationUuid": "3500b0d0-8d98-46d6-80d8-6363c09e887c",
"duration": "5 Months"
},
"enrollments": [],
"ratings": []
}
],
"meta": {
"totalItems": 209,
"itemCount": 3,
"itemsPerPage": 6,
"totalPages": 35,
"currentPage": 1
},
"links": {
"first": "http://ourakademy.com/api/v1/courses?limit=6",
"previous": "",
"next": "http://ourakademy.com/api/v1/courses?page=2&limit=6",
"last": "http://ourakademy.com/api/v1/courses?page=35&limit=6"
}
}
}

Assuming you put your json response in sampleJson variable
let sampleJson = YOUR JSON RESPONE
let sum = 0
let noOfRatings = 0
if(sampleJson && sampleJson.data && sampleJson.data.items){
sampleJson.data.items.forEach(item => {
item.ratings.forEach(i => {
if (i && i.rating) { sum += i.rating; noOfRatings++ }
})
});
if(sum && noOfRatings){
let averateRating = sum / noOfRatings
console.log('Average Rating : ',averateRating)
}
}
You will get average rating using this code.
Hope it helps :)

This is how i fixed the problem
const courses: any = await this.find();
for (let i = 0; i < courses.length; i++) {
const course = courses[i];
const sum: any = course.ratings.reduce((accumulator, object) => {
return accumulator + object.rating;
}, 0);
courses[i] = {
...course,
avg: sum / course.ratings.length,
};
}
return courses;

Object with nested array to filter, want to return entire object with new filtered array

I'm attempting to remove an object out of an array nested within my movie object and then copy it to a new variable. So my original object looks like this:
{
"id": 1,
"title": "Avatar",
"movieLength": 162,
"releaseDate": "2009-12-18",
"trailerUrl": "https://www.youtube.com/watch?v=5PSNL1qE6VY",
"genre": {
"id": 1,
"genre": "Action"
},
"rating": {
"id": 3,
"rating": "PG-13"
},
"director": {
"id": 1,
"lastName": "Cameron",
"firstName": "James"
},
"actors": [
{
"id": 2,
"lastName": "Worthington",
"firstName": "Sam"
},
{
"id": 3,
"lastName": "Weaver",
"firstName": "Sigourney"
},
{
"id": 4,
"lastName": "Saldana",
"firstName": "Zoe"
}
],
"comments": []
}
and what I'm doing right now is
const updatedMovie = const updatedMovie = movie.actors.filter((actor) => actor.id !== id);
but as you know that only returns the array of actors I filtered. I want to copy the entire object with the newly filtered actors so the object will come out like this (removing actor id 3):
{
"id": 1,
"title": "Avatar",
"movieLength": 162,
"releaseDate": "2009-12-18",
"trailerUrl": "https://www.youtube.com/watch?v=5PSNL1qE6VY",
"genre": {
"id": 1,
"genre": "Action"
},
"rating": {
"id": 3,
"rating": "PG-13"
},
"director": {
"id": 1,
"lastName": "Cameron",
"firstName": "James"
},
"actors": [
{
"id": 2,
"lastName": "Worthington",
"firstName": "Sam"
},
{
"id": 4,
"lastName": "Saldana",
"firstName": "Zoe"
}
],
"comments": []
}
I've tried reading around but I'm not having any luck getting any solutions to work with me, so if anyone can help or point me in the right direction that would be great!

If you want to mutate the existing object, just assign the result of the .filter to the .actors property.
movie.actors = movie.actors.filter((actor) => actor.id !== id);
console.log(movie);
If you want to keep the existing object unmutated, spread the rest of the properties into a new object while filtering.
const updatedMovie = {
...movie,
actors: movie.actors.filter((actor) => actor.id !== id)
};
console.log(updatedMovie);

const movies = {
"id": 1,
"title": "Avatar",
"movieLength": 162,
"releaseDate": "2009-12-18",
"trailerUrl": "https://www.youtube.com/watch?v=5PSNL1qE6VY",
"genre": {
"id": 1,
"genre": "Action"
},
"rating": {
"id": 3,
"rating": "PG-13"
},
"director": {
"id": 1,
"lastName": "Cameron",
"firstName": "James"
},
"actors": [
{
"id": 2,
"lastName": "Worthington",
"firstName": "Sam"
},
{
"id": 3,
"lastName": "Weaver",
"firstName": "Sigourney"
},
{
"id": 4,
"lastName": "Saldana",
"firstName": "Zoe"
}
],
"comments": []
}
const id = 3; // or any other id you want
const actors = movies.actors.filter(actor => actor.id != id)
const newMovies = Object.assign({}, movies , { actors })
console.log(newMovies)

How to check for duplicate data sets in JSON payload using JavaScript?

I would like to find duplicate data sets from below payload using combination of 'NAME', 'ID'. If a set exist more than 3 times, I need to return NAME, ID of duplicated data set.
{
"Test": "1",
"value": [
{
"NAME": "ABCD",
"ID": "1234",
"ACTIVE": "true"
},
{
"NAME": "EFGH",
"ID": "5678",
"ACTIVE": "true"
},
{
"NAME": "EFGH",
"ID": "5678",
"ACTIVE": "true"
},
{
"NAME": "EFGH",
"ID": "5678",
"ACTIVE": "true"
},
{
"NAME": "ABCD",
"ID": "1234",
"ACTIVE": "true"
},
{
"NAME": "ABCD",
"ID": "1234",
"ACTIVE": "true"
},
{
"NAME": "IJKL",
"ID": "91011",
"ACTIVE": "true"
}
]
}
Expected output:
["ABCD:1234", "EFGH:5678"]

Try this. You can improve this further by performance wise, if you work around a bit.
var data = {
"Test": "1",
"value": [
{
"NAME": "ABCD",
"ID": "1234",
"ACTIVE": "true"
},
{
"NAME": "ABCD",
"ID": "1234",
"ACTIVE": "true"
},
{
"NAME": "ABCD",
"ID": "1234",
"ACTIVE": "true"
},
{
"NAME": "EFGH",
"ID": "5678",
"ACTIVE": "true"
},
{
"NAME": "IJKL",
"ID": "91011",
"ACTIVE": "true"
}
]
};
var objArray = data.value;
var duplicates = []; // duplicates will be stored here.
for(var i=0, iLen = objArray.length; i<iLen;i++){
var obj = objArray[i];
var filtered = objArray.filter(function(arrVal) {
return arrVal.NAME === obj.NAME && arrVal.ID === obj.ID ;
});
var dup = obj.NAME + ":" + obj.ID;
if(filtered.length>=3 && duplicates.indexOf(dup) < 0) {
duplicates.push(dup);
}
}

this questuon was answered multiple times on SO. You create array from the json and compare the elements of the array.
How to remove all duplicates from an array of objects?

According to your sample output I believe it's "at least 3 times" rather than "more than 3 times".
Below snippet can product the expected output with the sample data.
const data = {
"Test": "1",
"value": [
{
"NAME": "ABCD",
"ID": "1234",
"ACTIVE": "true"
},
{
"NAME": "EFGH",
"ID": "5678",
"ACTIVE": "true"
},
{
"NAME": "EFGH",
"ID": "5678",
"ACTIVE": "true"
},
{
"NAME": "EFGH",
"ID": "5678",
"ACTIVE": "true"
},
{
"NAME": "ABCD",
"ID": "1234",
"ACTIVE": "true"
},
{
"NAME": "ABCD",
"ID": "1234",
"ACTIVE": "true"
},
{
"NAME": "IJKL",
"ID": "91011",
"ACTIVE": "true"
}
]
};
const occurrence = {}; // key: count
const result = [];
for (const item of data.value) {
const key = `${item.NAME}:${item.ID}`;
occurrence[key] = (occurrence[key] || 0) + 1;
if (occurrence[key] >= 3) {
result.push(key);
}
}
console.log(result);

Return new form of arrays - javascript

My data:
{
"rows": [
{
"id": 3,
"code": "airtel121",
"position": "manager",
"salary": "25000",
"login": {
"id": 4,
"username": "sameer",
"firstName": "Mohamed",
"lastName": "Sameer",
"code": "airtel121",
}
},
{
"id": 7,
"code": "airtel121",
"position": null,
"salary": null,
"login": {
"id": 8,
"username": "annamalai",
"firstName": "Anna",
"lastName": "malai",
"code": "airtel121",
}
}
]
}
My expected outcome:
{
"rows": [
{
"id": 4,
"username": "sameer",
"firstName": "Mohamed",
"lastName": "Sameer",
"code": "airtel121",
"staffs": [
{
"id": 3,
"code": "airtel121",
"position": "manager",
"salary": "25000",
}
]
},
{
"id": 8,
"username": "annamalai",
"firstName": "Anna",
"lastName": "malai",
"code": "airtel121",
"staffs": [
{
"id": 7,
"code": "airtel121",
"position": null",
"salary": null",
}
]
}
]
}
I tried, but only i am getting first object, check my fiddle:
http://jsbin.com/qaqehakuwi/edit?js,output
Is this possible to loop using for loop or it can be done by lodash?
Check my above jsbin link for code.
I am using ES6 way of code in my project, so i used spread operator.

You can use map to create the rows array of the new object from the rows array of the old one:
let newObj = {
rows: oldObj.rows.map(row => { // map the rows of the old object into the rows of the new object
let { login, ...rest } = row; // for each object/row get the login object as 'login' and the rest of the props as 'rest'
return { ...login, staffs: [rest] }; // return a new object that has the props of 'login' and an additional prop 'staffs' which is an array containing 'rest'
})
};
Example:
let oldObj = {"rows":[{"id":3,"code":"airtel121","position":"manager","salary":"25000","login":{"id":4,"username":"sameer","firstName":"Mohamed","lastName":"Sameer","code":"airtel121"}},{"id":7,"code":"airtel121","position":null,"salary":null,"login":{"id":8,"username":"annamalai","firstName":"Anna","lastName":"malai","code":"airtel121"}}]};
let newObj = {
rows: oldObj.rows.map(row => {
let { login, ...rest } = row;
return { ...login, staffs: [rest] };
})
};
console.log(newObj);

Return filtered array js

I have an Array of Objects, each containing Array and Objects, like so:
data = [{
"id": 10022,
"date": "2017-12-31T03:44:19.963808Z",
"bought_beats": [{
"id": 10034,
"beat": {
"id": 6334,
"name": "Glass",
"producer": {
"id": 23,
"display_name": "MadReal",
}
},
"license": {
"id": 10034,
"name": "Premium",
},
}, {
"id": 894,
"beat": {
"id": 6334,
"name": "Other Name",
"producer": {
"id": 25,
"display_name": "Other Name",
}
},
"license": {
"id": 10034,
"name": "Premium",
},
}]
}, {
"moredata": "stuff"
}]
And I need to filter the bought_beats property, and only return beat, if beat.producer.id === 23
This is what I have but it's clearly not working
data.forEach(order => {
return order.bought_beats.filter(item => item.beat.id === producerId)
})
===========
Edit1:
Trying this. It "works", but it also removed some properties (id & date) from each order object (which is each index of data), so I have objects that only contain the array of "bought_beats"
var res = data.map(item => item.bought_beats.filter(item => item.beat.producer.id === 23))
========
Edit2
This seems to be 1 solution, it maintains the array and object structure the same, while it removes those unwanted elements from the bought_beats array.
data.forEach(order => {
let elementToRemoveIndex = order.bought_beats.findIndex(item => item.beat.producer.id !== 23)
order.bought_beats.splice(elementToRemoveIndex, 1)
})
Thanks #Pac0 for the continuous help

use .find over data.bought_beats since its an array,
DEMO
var data = [{
"id": 10022,
"date": "2017-12-31T03:44:19.963808Z",
"bought_beats": [{
"id": 10034,
"beat": {
"id": 6334,
"name": "Glass",
"producer": {
"id": 23,
"display_name": "MadReal",
}
},
"license": {
"id": 10034,
"name": "Premium",
},
}, {
"id": 894,
"beat": {
"id": 6334,
"name": "Other Name",
"producer": {
"id": 25,
"display_name": "Other Name",
}
},
"license": {
"id": 10034,
"name": "Premium",
},
}]
}, {
"moredata": "stuff"
}];
var result = data.find(dat => dat.bought_beats.some(item => item.beat.producer.id === 23));
console.log(result);

If I understood correctly, this should be what you want :
// project each object to its bought_beats / beats part
var beatsArrays = data.filter(x => x.bought_beats).map(x => x.bought_beats);
// flatten the array of arrays of beats into a simple array of beats
var beats = [].concat.apply([],beatsArrays).map(x => x.beat);
// filter
var relevantBeats = beats.filter(item => item.producer.id === 23);
// serve with a cherry in a sugar-frost cocktail glass (happy new year ! )
console.log(relevantBeats);
Snippet :
data = [{
"id": 10022,
"date": "2017-12-31T03:44:19.963808Z",
"bought_beats": [{
"id": 10034,
"beat": {
"id": 6334,
"name": "Glass",
"producer": {
"id": 23,
"display_name": "MadReal",
}
},
"license": {
"id": 10034,
"name": "Premium",
},
}, {
"id": 894,
"beat": {
"id": 6334,
"name": "Other Name",
"producer": {
"id": 25,
"display_name": "Other Name",
}
},
"license": {
"id": 10034,
"name": "Premium",
},
}]
}, {
"moredata": "stuff"
}];
// project each object to its bought_beats / beats part
var beatsArrays = data.filter(x => x.bought_beats).map(x => x.bought_beats);
// flatten the array of arrays of beats into a simple array of beats
var beats = [].concat.apply([],beatsArrays).map(x => x.beat);
// filter
var relevantBeats = beats.filter(item => item.producer.id === 23);
// serve with a cherry in a sugar-frost cocktail glass (happy new year ! )
console.log(relevantBeats);

// for each order
data.forEach(order => {
// we loop thorugh the bought beats array
order.bought_beats.forEach((item, index) => {
// and if there's a beat from another producer, we remove it
if (item.beat.producer.id !== producerId) order.bought_beats.splice(index, 1)
})
})