Learn JavaScript Array Reduce In 10 Minutes

By far the most difficult JavaScript array method to learn is the reduce method. It combines together many concepts from other array methods, but also acts in a completely different way. In this video I will be going in depth over everything you need to know about this method so you can start using it in your next project.

📚 Materials/References:

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⏱️ Timestamps:

00:00 - Introduction
00:45 - Basics of reduce
04:50 - Second reduce example
07:17 - Advanced reduce features

#ReduceArray #WDS #JavaScript

[rosseaton]

This was the most simple and straight forward example of reduce I've seen. Thank you!

[STUPIDYOUTUBE_HIDINGMSGS]

What I love about Kyle's teaching style and videos is he first writes the code in another familiar way then converts it into the topic he's about to discuss. Whenever I want to learn something quickly and clearly without fuzz, like Recursion, his videos are my go-to learning material! He breaks it down step-by-step full of detailed explanations. Amazing!

[Vibestr]

Another good reason to set the second parameter on the reduce is if you are totaling price on an object (like in your example) and you didn't set this parameter to 0, then total would represent the object (the first item in the array) and your code would error out. Thank you for this video Kyle.

[kelseymovies]

Thank you for this! I just took a whole course about it and got even more confused. Your video broke it down to a point where it clicks.

[ademlayes]

I've watched this video twice, once before ~5 months and now after forgetting what "reduce" does... and im so thankful every time! Thank you!

[MrGodman]

Last week I was struggling with aggregate of object attributes in an array of objects due to the missing intiial value of 0 and I learned it the hard way. Also I had the groupby use case well. Thanks for simplying groupBy.

[elie]

very good explanation of the reduce method, it is clear and simple.
I'm a french developper in training and I understood everything, thank you and good continuation for your YouTube channel

[NaroTaro]

I've been stuck on understanding reduce for 2 days now. This video cleared everything up. Thanks!

[alirezashahmoradi]

I cant believe how you made it that simple. Thank you!!

[pugazhonline]

I have used reduce() many times. but clearly understand now. Thanks Kyle.

[MrLiquitorleaveit]

Incredibly well explained! Thanks so much! 🙏

[johnjoyce]

best explanation of reduce in javascript that i have ever seen. be cautious saying amunnuh when you mean “I’m going to”. that can be difficult for non native listeners

[kp]

Man, you helped me solve a problem that's been kicking my butt for a LONG time. THANK YOU!

[rajat]

I was looking for resources to learn about `reduce` method. Your video came in as a rescue Kyle.. 😍
You are a saviour!!

[donotlook]

This guy really uploaded this video 2 weeks ago and today I needed to use reduce and didn't know it worked, now i do thanks man. Whenever I need to understand something new I just type the concept + webdevsimplified and watch ur video lol

[Sun-gkfc]

7 the video on reduce in the last 40 mins and this is as simple as you can get...superb. A like and a subscribe from me.

[_boza]

I think you said the best definition of reduce ever. "Reduce, all it does. It takes array of values whatever that is and reduces it down to one single value"

[SiddhantaPaul]

That's an impressive straight forward explanation!
Really liked the analogy with forEach Loop.

[viniciusSP]

Dude... you're amazing! Thanks a lot! You're so much better than my teacher LOL
Thanks for your content! I'll be buying your course soon. :)
Have a nice day!

[nabilelidrissi]

I've watched a fair few videos on reduce, but you have explained this wayyyy better.