Mahmoud: asynchronous-programming, 3 chapters

[krakla]

Study Plan

Learning Objectives

• 🥚 You understand the JavaScript Event Loop, and can demonstrate this by using setTimeout and setInterval to schedule simple tasks.
• 🥚 You can explain why Asynchronous Programming is important for programs that have blocking and non-blocking tasks.
• 🥚 You can explain the basics of the Client/Server model and HTTP requests and can fetch data from RESTful APIs.
• 🥚 You can convert built-in Node modules from consuming callbacks being promises.
• 🐣 You can write and run JavaScript for Node.js or for the Browser. Both environments run JavaScript but they have some important differences!
  • use cases: You can explain some use cases that are unique to each runtime.
  • built-in APIs: You can list some of the key APIs available in each environment, and why they are not available in the other.
  • module systems: You can explain the difference between CommonJS Modules in Node.js and ES Modules in the Browser. You can write and use programs written with either system.
• 🐣 You can break down an asynchronous problem into smaller tasks and solve it using promises. This includes identify which tasks depend on each other and which are independent:
  • dependent tasks: The return value from one task is required to start the next task, these must be completed in a specific order - .then
  • independent tasks: These tasks do not use each other's return values, they can be completed at the same time - Promise.all
• 🐣 You can trace, refactor and write code that accesses the file system between these 3 different syntaxes:

1. • Callbacks
2. • Promises
3. • async/await

• 🐣 You can step through a Node.js command line application using the VSCode debugger.
• You can write small programs with a Data Access layer that asynchronously uses data stored in different locations:
  • 🐣 Browser: You can write a small web page that fetches data from a RESTful API and renders it into the DOM.
  • 🐥 Node: You can write a small CLI program that reads user input from process.argv and reads/writes the file system.

[krakla]

Chapter 1: the event loop

Check-In

I Need Help With:

• It's fine, Thanks :)

What went well?

Understanding the purpose of the event loop and callstack

What went less well?

• Still I want to study examples and exercises more but the time is tight.

Lessons Learned

• the event loop,
• event/task queue ,
• call stack
• settimeout
• set interval
• promises
• resolve vs reject
• .then vs .catch

Sunday Prep Work

• reading about Sequential vs. Parallel and practicing