JavaScript Event Loop: How it Works and Why it Matters
In this illustration:
The script starts with the message 'Start of the script'.
The setTimeout function is used to create an asynchronous operation. The callback inside setTimeout is pushed to the event queue after a delay of 0 milliseconds (in practice, it might not be exactly 0 due to how the browser/runtime handles it).
The script continues to execute, printing 'End of the script'.
Now, the event loop takes the callback from the event queue and executes it, printing 'Inside setTimeout callback'.
Additionally, the script includes a Promise example to illustrate another asynchronous operation. The Promise constructor is used to create a promise that resolves after a simulated delay of 2000 milliseconds. The then method is then used to handle the resolved value.
Understanding the event loop helps in dealing with asynchronous operations and ensures that code behaves as expected in various scenarios.
-
1:11:53
Havoc
14 hours agoWhat's a Classic | Stuck Off the Realness Ep. 5
144K6 -
49:35
Donald Trump Jr.
15 hours agoHULK HOGAN LIVE FROM THE RNC
251K207 -
6:27:56
Benny Johnson
15 hours ago🚨Donald Trump, Tucker, Kid Rock, Dana White, Hulk Hogan Bring Down the House at RNC | LEGENDS 🔥
299K168 -
5:42:34
Akademiks
16 hours agoCardi B Goes Crazy on Joe Budden. Schoolboy Q Declares War on OVO. Big Sean goes at Kendrick/Haters?
224K44 -
6:52:29
Drew Hernandez
18 hours agoPRESIDENT DONALD J. TRUMP SPEAKS: RNC NIGHT 4
162K56 -
25:59
FrankSpeech Lindell TV
16 hours agoEmerald Robinson and Mike Lindell Live From Rumble Booth
109K17 -
56:06
Kimberly Guilfoyle
15 hours agoDay 4 of the RNC, Nelk Boys live!
163K95 -
1:27:15
Redacted News
16 hours agoThe TRUTH in Trump's Assassination Plot is Coming Out | Redacted w Natali and Clayton Morris
239K859 -
1:06:39
Russell Brand
16 hours agoTHE BIG FINALE at RNC: LIVE with Dan Bongino, Charlie Kirk & Nigel Farage - SF 411
298K394 -
2:27:31
Tucker Carlson
18 hours agoMike Cernovich on Epstein, Demons & Spirituality, and Feds Embedded in the Conservative Movement
338K325