Exploring the elements within an array of objects using JavaScript

Question

Exploring the elements within an array of objects using JavaScript

I am currently working on a challenge to calculate the total number of likes. However, I am encountering an issue where I am receiving an error message stating that the posts do not exist. The user object contains a property called posts, which is an array of objects. Can anyone provide guidance on how to correctly access the likes property within this structure? Thank you.

//Initialize the sum variable
var sum = 0;

//Create a user object with posts property
var user = {
    posts: [
        {
            likes: 10
        },
        {
            likes: 15
        }
    ]
}

//Iterate through the posts array and calculate the total sum of likes
for (i = 0; i < posts.length; i++) {
    sum += user.posts[i].likes;
}

return sum;

javascript arrays javascript-objects

Answer 1

Answer №1

reduce() is a helpful method for aggregation in JavaScript:

var user = { items: [ { count: 5 }, { count: 8 } ] }

var total = user.items.reduce((acc, obj) => acc + obj.count, 0)

console.log(total)

Answer 2

reduce() is a helpful method for aggregation in JavaScript:

var user = { items: [ { count: 5 }, { count: 8 } ] }

var total = user.items.reduce((acc, obj) => acc + obj.count, 0)

console.log(total)

Answer 3

Answer №2

Below is the corrected code:

let sum = 0; //initialize sum
//create user object
const user = {
    posts: [{
            likes: 10
        },
        {
            likes: 15
        }

    ]
}
//Calculating the sum of all likes. But the current implementation is incorrect.
for (let i = 0; i < user.posts.length; i++) {
    sum += user.posts[i].likes;
}
console.log(sum);

Answer 4

Below is the corrected code:

let sum = 0; //initialize sum
//create user object
const user = {
    posts: [{
            likes: 10
        },
        {
            likes: 15
        }

    ]
}
//Calculating the sum of all likes. But the current implementation is incorrect.
for (let i = 0; i < user.posts.length; i++) {
    sum += user.posts[i].likes;
}
console.log(sum);

Answer 5

Answer №3

Accessing object property directly as posts.length will result in undefined being thrown. Instead, you should access it as user.posts.length:

for(var i=; i<user.posts.length; i++){
  sum += user.posts[i].likes;
}
return sum;

Answer 6

Accessing object property directly as posts.length will result in undefined being thrown. Instead, you should access it as user.posts.length:

for(var i=; i<user.posts.length; i++){
  sum += user.posts[i].likes;
}
return sum;

Answer 7

Answer №4

Alternative to using a function

var sum = 0;
var user = {
    posts: [
      {
       likes: 10
     },
      {
       likes: 15
     }

]
}

user["posts"].forEach(item => sum += item["likes"]);
console.log(sum);

Answer 8

Alternative to using a function

var sum = 0;
var user = {
    posts: [
      {
       likes: 10
     },
      {
       likes: 15
     }

]
}

user["posts"].forEach(item => sum += item["likes"]);
console.log(sum);

Exploring the elements within an array of objects using JavaScript

Answer №1

Answer №2

Answer №3

Answer №4

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