Asynchronous Javascript

Javascript is synchronous, blocking, single-threaded language. Code executes top-down and only one line is executed at a time.
Single-threaded? Thread is a process that program can use to run a task, each thread can only do one task at a time.

There are ways to implement asynchronous code by using:

• timeouts and intervals
• callbacks
• promises
• async/await
• event loop

Read more

• youtube.com/video "Asynchronous JavaScript Crash Course" by Codevolution.
• youtube.com/video "Javascript promises -- Tutorial for beginners" by ColorCode.