Array Reduce in 100 seconds

Learn JavaScript's Array Reduce method in 100 seconds. Take many things and reduce them down to one thing.

#JavaScript #100SecondsOfCode

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[Oswee]

I love how you show the "vanilla" for loop in comparison. That gives complete context for reduce.

[juliohintze]

If you omit the reduce's second argument, the loop will start at the second item, and the accumulator will be the value of the first item in the first iteration.

This is useful if you are just adding the values in a number array. If you are trying to reduce an array of objects to a number, you shouldn't omit the second argument (specially if you are using TypeScript, that sets the .reduce() return type to the second argument's type or, if omitted, the array type)

[rolikaseventysix]

I love this one. Short (no bullshit), but yet fully explanatory. Absolutely fits the needs of a newbie or an advanced programmer, who wants to refresh his knowledge. Thank you!

[waadlingpenguin]

fireship: explains the reduce method in depth in 100 seconds
also fireship: tries to explain all of react in 100 seconds

[Nyasha_Nziboi]

Thank you so much for this iv always struggled to understand reduce till now

[StephenMoreira]

I am liking these in 100 seconds clips. Thanks.

[yourpersonaldatadealer]

Really loving these short episodes as fillers. Cheers Jeff 🙏🏻

[stepsxa]

Starting to ask myself why I wasted hours of my life learning programming concepts only to discover your channel years later, explaining them better in 100 seconds each. Thanks for refreshing my memory on this and keep 'em coming!

[stoicfloor]

The visual of your videos is just exceptional!

[alberto.polini]

I likes this format, maybe i can apply It to my videos too.
You are doing a great job😊

[bullfrog]

As someone that uses js alot these are nice videos to help other people understand js, nice job :D

[berkeguzel]

Thank you Fireship, for providing your VS Code theme and font in the video description!

[aleksandarstevanovic]

You guys are reading my mind! I just starred replacing regular forEach loop with reduce wherever I can

[TheEnde]

Been working with js for a while and never really got the reduce method, thanks!

[Noah-vmid]

Reducers are so useful... once you got the concept you can do really great things with them

[will_abule]

Great now I've to change my shopping cart function but I like better 😁 thanks Jeff 🤓 these short tips are useful 👌

What a good explanation. Thank you so much!

[easifier]

This is very helpful
Thank you really for this short this clear explanation

[randomcharacters]

Really enjoying these, excited for more 👍

[alekseysoldatenkov]

The true utility behind arr.reduce() is modifying different parts of the array based on the current value and/or index; not less typing vs. a for-loop.
Because a for-loop can do all a basic arr.reduce() method can, plus it can be made faster by doing a reverse for loop.