How to sum an array in javascript using the reduce method #shorts

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[razvbir]

Reduce also has a second parameter that you can you use to set an initial value.

[dancehalllyrics]

That was by far the clearest explanation of the sum method!

Well done!

[ebubesunday]

Don't know why I'm finding shorts more helpful these days. Your video is just one of them. Thanks!

[SpaghettiRealm]

You should add 0 as initial value for sum to prevent any unexpected result

[dcknature]

Very helpful and way shorter to write than a whole for loop 👌.
Thanks so much for the video 👍!

[assaulterpt]

Start on line 6. It's one more line of ease of visibility

[Yutaro-Yoshii]

Other useful tricks
Standard deviation
let sdev = Math.sqrt(arr.map(v=>v*v).reduce((a, b)=>a+b));

[repenning]

even shorter: numbers.reduce((sum, value) => sum + value) // return and "{" "}" not needed

[SyberiaK]

In Python, you can use sum() function.

[Templarfreak]

this kind of looks like about the same amount of code as doing a normal loop, but its imo a lot more descriptive. it does something specialized, and it seems to pretty clearly tell you that specialized thing it's doing, so that definitely is a plus over doing a normal loop for this kind of situation

[accidentalengineering]

One crucial feature is the initial value. If you don't provide one the first value in your array will be the first sum value, and iteration starts at index 1.

[nanaowusuoduro]

Bruh i love you... you're making my life so simple

[mrgerbeck]

ALWAYS provide the second initial value.

[MrJeszam]

Suggestion for this Youtube SHORT VIDS, can you somehow Zoom out the result.. cause daammmn.. I cannot see the full result.

[swanand]

I don't know the practical use of this method except Sum of the numbers 🤣

[danbopes]

And that ladies and gentleman, is why undefined + 1 = 1.

[donaldjr.labajo]

I think you missed the default value for .reduce, optional though after the callback.

[disko.kommando]

Learning JS for a project after learning a few other languages. I can't help but ask what were they smoking when they came up with this crazy syntax? 😂

[ndk]

u forgot to mention one more crucial param of the callback fn. the initial starting value.

[eduardmarinca]

i know that after the callback function, you have to put 0, to start from 0 or something. to start from index 0 or something, don t know