Promise Chaining

The video tutorial guides students through a challenge involving promise chaining in JavaScript. It begins with setting up the environment by creating a new file and loading Mongoose and the task model. The main tasks include removing a task by its ID and counting incomplete tasks using promise chaining. The tutorial provides detailed instructions on using Mongoose methods like findByIdAndDelete and countDocuments. It concludes with testing the implementation and introduces the next topic, async/await, highlighting its significance in asynchronous programming.

What is the main goal of the challenge introduced in the video?

• To explore database indexing

• To understand synchronous programming

• To practice promise chaining

• To learn about async/await

Why is it important to create a separate file for the examples?

• To keep the code organized for future lectures

• To avoid file size issues

• To enable parallel processing

• To improve code execution speed

Which library is loaded to interact with the database in the challenge?

• Knex

• TypeORM

• Mongoose

• Sequelize

What is the first asynchronous task to perform in the challenge?

• Update a task by ID

• Remove a task by ID

• Create a new task

• List all tasks

Which Mongoose method is used to delete a task by its ID?

• deleteOne

• findOneAndDelete

• findByIdAndDelete

• removeById

What is the expected count of tasks after deleting one task in the demonstration?

• Four

• One

• Three

• Two

What is the purpose of the catch block in the promise chain?

• To execute code after the promise resolves

• To handle any errors that occur during the promise execution

• To chain another promise

• To log the result of the promise