Node js Tutorial for Beginners - 4 - Callback Function

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Callback Functions in NodeJS

NodeJS | NodeJS Tutorial for Beginners | NodeJS Callback Functions
Node js | Node js Tutorial for Beginners | Node js Callback Functions

[sazk]

i love this diagram with visual explanations. perfect for understanding

[vitthalparkar]

call back functions are api ajax call using get and post methods. it will wait until api returns data, once it returned it is trapped against success or error. and another example could be indexed db call back.

[ravikumar-supy]

lucid and clear. Arigatho gozaimashitha

[nathandunn]

I think this explanation was great. Examples by others have you using callbacks without understanding the big picture. You provided that for me thank you.

[ruudhermans]

Just an addon. What you set as waiting period is a MINIMUM waiting period due to the way the JavaScript event loop works. It's places into the callback queue after x seconds and the loop will see it soon as the stack is empty.

[mohinderlamba]

Excellent explanations. Good examples. Good delivery. Looking forward to more from you.

[fernandoak]

great tutorial Vishwas, very difficult to follow the font size, though.

[upendraallu]

Great job Joatman, got something new about callbacks with this tutorial, keep going.

[shoaibjarman]

great presentation man. understood much better than handson expirience.

[RyanDeeds]

thanks fot this - the delay print really helped concpetualize it.

[varthalasaikumar]

good explanation sir, but explain with event loop, call stack, and api block diagram that will be more clear..thank you

[dontusehername]

In the 1st example "picking package for neighbor", why does X go to neighbor Z?

[nomnom]

Easy explanation for a noob like me. love it...

[jonathancaldwell]

Sorry, I either didn't get it or didn't follow your line of thinking. I'm trying to understand how callbacks are typically used in node.js when things are happening "too fast" (vs taking too long?)... I came here from another course that is a bit further along though, so I think I was just looking for something more specific. I don't wanna give you a down vote though, so I'm just leaving a note. Thanks for the effort!

[taylora.buckner]

Corrected Title: "Theoretical Explanation of Callbacks, and How to use setTimeout"

[zsams]

explanation is clear to me but when i tried code like this
setTimeout(function(){
console.log('testing');
}, 500);

for(var i = 0; i < 20000; i++){
console.log(i);
}

i expect "testing" to display somewhere in between 0 to 20000.
but testing display after 20, 000 so i m pretty sure the video left out something important

[RocketLR]

Can you pass parameters to the callback ? :S

[CarlWicker]

Awesome thanks, really well explained.

[ttone]

Great Explanation unless something has a link to something better!!! It help me out as the noob i am.

[VarunVermaUSC]

My honest feedback: I was hoping to see a little more advanced tutorial. The title of the video is callback function but it's only relevant to the last minute or so in the video.