What is the best way to associate and merge lists from one object to another object using unique identifiers?

Question

What is the best way to associate and merge lists from one object to another object using unique identifiers?

I have a task that involves extracting information from two JSON files. The goal is to log the names from one file and for each name, list the corresponding titles from the other file. The connection between the two files is made using an ID, although one file refers to it as "id" while the other uses "userId" (there is also another key named id which serves a different purpose).

The data can be found at the following URLs: https://jsonplaceholder.typicode.com/posts and https://jsonplaceholder.typicode.com/users

What I am looking to achieve is a format similar to this:

name1<br>
-title1<br>
-title2<br>
-title3<br>
-title4<br>

name2<br>
-title5 <br>
-title6<br>
-title7<br>
-title8

javascript arrays json object

Answer 1

Answer №1

To tackle this problem, you can implement a solution using a nested for-loop:

for (let user of users) {
  console.log(user.name);
  for (let title of titles) {
    if (user.id == title.userId) {
      console.log(`\t- ${title.title}`);
    }
  }
}

Executing the code would yield output similar to the following:

Leanne Graham
    - sunt aut facere repellat provident occaecati excepturi optio reprehenderit
    - qui est esse
    - ea molestias quasi exercitationem repellat qui ipsa sit aut
    - eum et est occaecati
    - nesciunt quas odio
    # ...
Ervin Howell
    - et ea vero quia laudantium autem
    - in quibusdam tempore odit est dolorem
    # ...

Answer 2

To tackle this problem, you can implement a solution using a nested for-loop:

for (let user of users) {
  console.log(user.name);
  for (let title of titles) {
    if (user.id == title.userId) {
      console.log(`\t- ${title.title}`);
    }
  }
}

Executing the code would yield output similar to the following:

Leanne Graham
    - sunt aut facere repellat provident occaecati excepturi optio reprehenderit
    - qui est esse
    - ea molestias quasi exercitationem repellat qui ipsa sit aut
    - eum et est occaecati
    - nesciunt quas odio
    # ...
Ervin Howell
    - et ea vero quia laudantium autem
    - in quibusdam tempore odit est dolorem
    # ...

What is the best way to associate and merge lists from one object to another object using unique identifiers?

Answer №1

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