Exit Ticket: Day 6 - Express and Handling Asynchronous Code

day6-exit-ticket.md

Exit Ticket: Day 6 - Express and Handling Asynchronous Code

In your own words, what is a server?

• A HTTP server listens for HTTP requests and sends HTTP responses.
• Reference:
  • MDN: What is a web server?

What is the purpose of the package.json file in a Node project?

• Store a list of dependencies for the project
• Give the project a name
• Store metadata about the project
• All of the above ☑️
• None of the above
• Reference:
  • See the section "Properties of a package.json file" here.
  • Node: What is the file package.json?

What is Express?

• Node web framework for handling requests
• Provides mechanisms to:
  • Write handlers for requests with different HTTP verbs at different URL paths (routes)
  • Set common web application settings like the port to use for connecting
  • Add additional request processing “middleware” at any point within the request handling pipeline
• References:
  • Express.js documentation
  • MDN: Express/Node introduction
  • tutorialspoint: ExpressJS Overview

Which of the following statements are true about Express Middleware?

• An example of it could be app.use ☑️
• It happens between the request and response ☑️
• Only one middleware function can be called per request-response cycle
• An example of it could be app.get
• It sometimes runs after the response is sent
• A function that receives the request and response objects of an HTTP request/response cycle (i.e. (req, res, next) => {...}).

What is a Promise?

• An object that represents the eventual completion of an asynchronous operation and its resulting value
• Reference:
  • MDN: Using Promises