In this Hasty Treat, Scott and Wes define some JavaScript Buzzwords and talk about what they mean!

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Show Notes

03:24 - Synchronous / Async

05:23 - Multi-threaded

JavaScript has a single “main thread”
But you can have more threads with web workers

08:12 - Blocking

JavaScript can stop other things on the page from running
A script tag can block HTML from being parsed
Most stuff in JavaScript is non-blocking
Node.js write to filesystem can be blocking

10:27 - Concurrent + Parallel

JavaScript start/stop are concurrent
The API runs on a different thread
Doesn’t REALLY matter
https://joearms.github.io/published/2013-04-05-concurrent-and-parallel-programming.html

13:22 - Consecutive / Waterfall

One after another

13:48 - Callback

A function to run when this thing happens or is done
Click event callback
Websocket on data callback
- Like a tweet stream
Data fetch callback
- Almost entirely replaced with async + await
http://callbackhell.com/
https://caolan.github.io/async/v3/

17:56 - Script Tag Async + Defer

Doesn’t block other content
Runs when ready - doesn’t care about DOMcontentLoaded
Wait until the page is loaded before running
If the script tag is above content, don’t wait for it
Good for things that aren’t called on page load

21:54 - Lazy

Load it in later - maybe when it’s scrolled into view, or as needed
Not mission-critical

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