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Labs

Refactoring JavaScript Promises with Async/Await

Lab platform
Lab Info
Level
Beginner
Last updated
Feb 07, 2025
Duration
1h 21m

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Table of Contents
  1. Challenge

    Creating the entry point

    Learn how to use setTimeout() to simulate an asynchronous call. ### Solution To view the solution, run git diff origin/master..module2-solution in the Terminal, and press Enter to see the next lines of the difference.

    You may also browse the files of the solution by stashing your changes with git stash and running git checkout module2-solution to switch branches.

  2. Challenge

    Create directory to store JSON

    In this module, we will fill in the fetchMovies function in index.js. ### Solution To view the solution, run git diff origin/master..module3-solution in the Terminal, and press Enter to see the next lines of the difference.

    You may also browse the files of the solution by stashing your changes with git stash and running git checkout module3-solution to switch branches.

  3. Challenge

    Remove fetchMovies() and moviePromise

    Learn how to run promises in parallel with Promise.all() and Promise.race(). ### Solution To view the solution, run git diff origin/master..module4-solution in the Terminal, and press Enter to see the next lines of the difference.

    You may also browse the files of the solution by stashing your changes with git stash and running git checkout module4-solution to switch branches.

  4. Challenge

    Create an async fetchMovies()

    Have fetchMovies() use async/await syntax instead of traditional promises. ### Solution To view the solution, run git diff origin/master..module5-solution in the Terminal, and press Enter to see the next lines of the difference.

    You may also browse the files of the solution by stashing your changes with git stash and running git checkout module5-solution to switch branches.

  5. Challenge

    Create an async fetchBooks()

    Have fetchBooks() use async/await syntax instead of traditional promises. ### Solution To view the solution, run git diff origin/master..module6-solution in the Terminal, and press Enter to see the next lines of the difference.

    You may also browse the files of the solution by stashing your changes with git stash and running git checkout module6-solution to switch branches.

  6. Challenge

    Import new async methods

    Turn our functions utilizing Promise.all() and Promise.race() into async functions. ### Solution To view the solution, run git diff origin/master..module7-solution in the Terminal, and press Enter to see the next lines of the difference.

    You may also browse the files of the solution by stashing your changes with git stash and running git checkout module7-solution to switch branches.

  7. Challenge

    Return an error in getBooksAndMoviesAsync()

    In this module, you'll learn how to handle errors in promises. ### Solution To view the solution, run git diff origin/master..module8-solution in the Terminal, and press Enter to see the next lines of the difference.

    You may also browse the files of the solution by stashing your changes with git stash and running git checkout module8-solution to switch branches.

  8. Challenge

    Create a timer to be cleared later

    Learn to create and clear timeouts created with setTimeout(). ### Solution To view the solution, run git diff origin/master..module9-solution in the Terminal, and press Enter to see the next lines of the difference.

    You may also browse the files of the solution by stashing your changes with git stash and running git checkout module9-solution to switch branches.

About the author

Software engineer in Chicago with 10+ years of experience working Javascript applications on both the client side and the server side.

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