5 Real Life Examples of Array Reduce in JavaScript

A lot of guides online (including my own) will show the "sum of all numbers" example when explaining how the array reduce method works.

In this video, I'll take you through 5 unique and applicable examples of using the reduce method in JavaScript.

Chapters:
0:00 Intro
0:40 Find the Sum of Numbers
3:01 Find the Sum of Numbers in an Object
4:49 Convert a 2D Array into an Object
7:31 Find the Max Value of an Array of Objects
9:47 Find the Number of Occurrences of Each Element
12:21 Outro

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#dcode #javascript

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[nawal]

how is prev[color] returning the color name but then (prev[color] || 0) + 1 is return a number. Also if I just console.log(prev[color]) it outputs numbers but i though I should output {green}. I'm well confused.

[shamrai]

You have a gift for explaining things clearly. I don't even understand English very well, but I understood you completely. Thank you

[DaviddelaHarpe]

dude! killer video. You're right, most reduce method tutorials focus on one scenario, adding up all the element of an array. Your video was far more comprehensive to real world scenarios. Very well explained too!

[dev_ression]

Good to meet a fellow Australian programmer bro! You've got a new sub

[srinivasaraoyp]

It's very useful. I should practice it. Thank you.

[saman]

I just found your channel, and as someone mentioned, good to see a nice Aussie instructor. Thanks 🙏

[NedumEze]

Amazing. Thank you Dom.
You've got a Computer's mind! Am envious. Wish you could help me figure out a PHP challenge.

[DavidMwai-djup]

Always a great tutor: Subscription should be @1m+ for the great content you always deliver

[karlstenator]

At 9:35 - if I try to return either the object, or the name of the highest salary object - I get an undefined return. Could you post the solution please?

[s유아마에브리띵]

I recommend this lecture. thanks a lot👍👍👍

[streamx]

I'm a little confused with the house building example. Shouldn't it be return prev.cost + material.cost?

[rysmo]

Nice one. Better used in complex methods.

[abubalo]

Array.reduce() is like array.filter() but on steroid. You can do a lot with it.

[marimuthur]

You are really awesome bro thank you so much for your knowledge sharing keep go ahead 👌🏼👌🏼👌🏼😊😊