mergeMap + forkJoin

2 snippets

6 mins

v.7

v.18

Fabio Biondi

Google Developer Expert
Microsoft MVP

1. https://jsonplaceholder.typicode.com/posts/1 : retrieves information about a single post, including the author's user ID
2. https://jsonplaceholder.typicode.com/users/1 : retrieves the user’s information.
3. https://jsonplaceholder.typicode.com/comments?postId=1 : retrieves comments related to the post

1. Perform a GET request to retrieve the post information and extract the user id
2. Make two parallel calls using the user id to get both the author’s information and the post's comments.

src/app.component.ts

src/user.ts

src/post.ts

src/comment.ts

src/main.ts

Output

# Post + User + Comments

Just like in the previous lesson, the issue is that only the result of the inner observable is emitted, causing us to lose the post information!

In the following example, we’ll emit both the post information and the user’s comments and details together

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