Podcasts Technology Syntax - Tasty Web Development Treats Hasty Treat - JavaScript Event Buzzwords Sync, Concurrent, Defer, Blocking, Workers

Hasty Treat - JavaScript Event Buzzwords Sync, Concurrent, Defer, Blocking, Workers

Published: July 5, 2021, 1 p.m.

b'

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

Freshbooks - Sponsor

Get a 30 day free trial of Freshbooks at\\xa0freshbooks.com/syntax\\xa0and put SYNTAX in the \\u201cHow did you hear about us?\\u201d section.

Sentry - Sponsor

If you want to know what\\u2019s happening with your code, track errors and monitor performance with Sentry. Sentry\\u2019s Application Monitoring platform helps developers see performance issues, fix errors faster, and optimize their code health. Cut your time on error resolution from hours to minutes. It works with any language and integrates with dozens of other services. Syntax listeners new to Sentry can get two months for free by visiting\\xa0Sentry.io\\xa0and using the coupon code TASTYTREAT during sign up.

Show Notes

03:24 - Synchronous / Async

05:23 - Multi-threaded

  • JavaScript has a single \\u201cmain thread\\u201d
  • 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

13:22 - Consecutive / Waterfall

  • One after another

13:48 - Callback

17:56 - Script Tag Async + Defer

  • Doesn\\u2019t block other content
  • Runs when ready - doesn\\u2019t care about DOMcontentLoaded
  • Wait until the page is loaded before running
  • If the script tag is above content, don\\u2019t wait for it
  • Good for things that aren\\u2019t called on page load

21:54 - Lazy

  • Load it in later - maybe when it\\u2019s scrolled into view, or as needed
  • Not mission-critical

Tweet us your tasty treats!

'