How To Use Reduce( ) in Javascript

[10,1000].reduce( (finalValue, whatToAddToFinalValue) => finalValue + whatToAddToFinalValue );

The array has 2 items [10, 1000], which means we run 2 iterations.

On each iteration, reduces() takes 1 item ONLY!

For the FIRST iteration, since we did not declare the finalValue starting value, so it will always be 0 :

We have whatToAddToFinalValue variable, which will get its value from the array – but one item at a time.

// FIRST ITERATION

finalValue = 0

whatToAddToFinalValue = 10 // the first item in the array

====== at the end of iteration, finalValue = 10

At the subsequent iteration, we will work with a new set of data :

// SECOND ITERATION

finalValue = 10

whatToAddToFinalValue = 1000 // the second item in the array

====== at the end of the second iteration, finalValue = 1010

reduce() function operation stops right here, because no more item left in the array to deal with.

You can use reduce() for a more complicated calculation. This article is meant for a beginner who is still trying to make sense of the concept of iteration.

Ready to read more about reduce()? Visit JS docs here.

93 Comments

  1. download February 1, 2021 at 6:24 am

    This post is invaluable. When can I find out more? Melany Walther Balch

  2. movies February 1, 2021 at 10:12 am

    I have read some just right stuff here. Definitely worth bookmarking for revisiting. I surprise how a lot effort you set to make this sort of wonderful informative website. Rosabella Bradley Rosol

  3. free movies February 1, 2021 at 11:48 am

    Hi there. I found your website by the use of Google at the same time as looking for a similar subject, your website got here up. It seems to be good. I have bookmarked it in my google bookmarks to visit then. Effie Raymund Meagher

  4. diziler February 1, 2021 at 9:33 pm

    I used to be able to find good advice from your blog posts. Minne Percy Higginson

  5. erotik February 1, 2021 at 11:29 pm

    Write more, thats all I have to say. Literally, it seems as though you relied on the video to make your point. You obviously know what youre talking about, why waste your intelligence on just posting videos to your blog when you could be giving us something enlightening to read? Hettie Otto Ruhnke

  6. watch free February 2, 2021 at 2:05 am

    Sit eum voluptatem nam blanditiis eligendi esse fugit. Libero enim harum fuga. Laborum aut ex non officiis et voluptatem. Janela Kerby Dawkins

  7. watch series online February 2, 2021 at 3:52 am

    Heya i am for the first time here. I found this board and I to find It truly useful & it helped me out a lot. Genovera Vic Alexia Kristel Towney Armand

  8. torrent February 2, 2021 at 8:06 am

    I am commonly to blogging as well as i truly appreciate your web content. The write-up has truly peaks my passion. I am mosting likely to bookmark your site and also keep checking for brand-new information. Miran Urson Emmit

  9. yetiskin February 2, 2021 at 9:12 am

    I really like it when people get together and share thoughts. Great website, stick with it! Jannel Dan Kingdon

  10. online February 2, 2021 at 2:33 pm

    There couple of fascinating points in time in this article but I do not determine if these center to heart. There may be some validity but I am going to take hold opinion until I take a look at it further. Good write-up , thanks therefore we want more! Combined with FeedBurner at the same time Gypsy Fleming Dasi

  11. dizi February 9, 2021 at 7:42 am

    Hi there. I discovered your blog by means of Google even as searching for a related topic, your web site came up. It appears great. I have bookmarked it in my google bookmarks to come back then. Guendolen Al Hinch

  12. mp3 February 9, 2021 at 9:31 am

    Great article. I will be dealing with many of these issues as well.. Maurine Gaylord Theona

  13. mp3 February 9, 2021 at 10:48 am

    If you are going for finest contents like myself, simply visit this site all the time as it provides feature contents, thanks| Uta Teddie Victory

  14. diziler February 9, 2021 at 12:18 pm

    I precisely needed to say thanks all over again. I do not know the things that I would have implemented in the absence of the actual information discussed by you about that area. This has been an absolute hard case in my position, however , looking at a professional strategy you handled that took me to jump with fulfillment. Now i am thankful for this service and as well , hope that you really know what a great job your are undertaking educating some other people all through your web page. I am sure you have never got to know all of us. Mariana Portie Barcellona

  15. BurlBNeisler February 16, 2021 at 11:59 pm

    If some one desires to become updated with newest technologies then he needs to be head to see this website and become current daily.

    Check out my homepage; BurlBNeisler

  16. android porn games February 22, 2021 at 10:57 am

    Can I simply say what a relief to uncover somebody that truly knows what they’re discussing over the internet. You actually know how to bring an issue to light and make it important. More people have to check this out and understand this side of the story. I was surprised you’re not more popular given that you definitely have the gift.

  17. brezilya fonu şampuanı February 27, 2021 at 12:34 pm

    https://www.lekekremim.com/ türkiyenin en iyi sitelerinden biri olan cilt aydınlatıcı
    şampuan leke kremi gibi bir çok ürünü barından ve tek marka üzerinden alışveriş seçeneği sunan lekekremim.com u ziyaret etmenizi tavsiye ediyoruz

  18. shell download March 1, 2021 at 12:54 pm

    Howdy! This is my first visit to your blog! We are a collection of volunteers and
    starting a new project in a community in the same niche.
    Your blog provided us beneficial information to work on. You
    have done a outstanding job!

  19. pocket inserts March 3, 2021 at 4:10 pm

    Hello, i think that i saw you visited my blog so i arrived at “return the
    favor”.I am just trying to find things to improve my site!I suppose its ok to work
    with a few of your thoughts!!

    my site :: pocket inserts

  20. MichaelEscom March 9, 2021 at 8:12 pm

    meds online without doctor prescription india pharmacy drugs

  21. MichaelEscom March 10, 2021 at 5:10 pm

    meds online without doctor prescription: https://genericwdp.com/ pills without a doctor prescription

  22. DouglasSox March 11, 2021 at 10:32 am

    “I must thank you for the efforts you have put in writing this site. I really hope to see the same high-grade content by you in the future as well. In truth, your creative writing abilities has encouraged me to get my very own website now ;)”
    נערות ליווי בתל אביב

  23. EmeryCen March 11, 2021 at 9:52 pm

    “Right here is the right web site for anybody who would like to understand this topic. You understand a whole lot its almost hard to argue with you (not that I really would want toÖHaHa). You definitely put a new spin on a topic which has been written about for ages. Excellent stuff, just excellent!”
    נערות ליווי בלוד

  24. EmeryCen March 12, 2021 at 2:35 am

    “I wanted to thank you for this fantastic read!! I definitely loved every little bit of it. I have you bookmarked to look at new stuff you postÖ”
    https://romantik69.co.il/

  25. EmeryCen March 12, 2021 at 3:15 am

    “After I originally left a comment I seem to have clicked the -Notify me when new comments are added- checkbox and now each time a comment is added I recieve 4 emails with the exact same comment. Is there an easy method you can remove me from that service? Kudos!”
    https://romantik69.co.il/נערות-ליווי-בתל-אביב/

  26. EmeryCen March 12, 2021 at 8:04 am

    “An interesting discussion is worth comment. I do believe that you should write more about this subject, it might not be a taboo subject but typically folks don’t talk about such topics. To the next! Cheers!!”
    נערות ליווי בגבעתיים

  27. EmeryCen March 12, 2021 at 1:06 pm

    “An interesting discussion is worth comment. I think that you need to publish more on this subject, it may not be a taboo subject but typically people do not speak about these topics. To the next! Best wishes!!”
    https://romantik69.co.il/

  28. EmeryCen March 12, 2021 at 1:47 pm

    “After I initially commented I seem to have clicked on the -Notify me when new comments are added- checkbox and from now on every time a comment is added I get four emails with the exact same comment. Perhaps there is a means you can remove me from that service? Many thanks!”
    נערות ליווי בתל אביב

  29. Jeffreytoise March 12, 2021 at 5:56 pm

    viagra over the counter walmart viagra discount
    buy generic 100mg viagra online

  30. EmeryCen March 12, 2021 at 6:49 pm

    “When I originally commented I seem to have clicked the -Notify me when new comments are added- checkbox and now whenever a comment is added I get 4 emails with the same comment. There has to be an easy method you can remove me from that service? Thanks a lot!”
    https://romantik69.co.il/נערות-ליווי-בתל-אביב/

  31. EmeryCen March 12, 2021 at 7:43 pm

    “I have to thank you for the efforts you’ve put in writing this blog. I really hope to view the same high-grade content by you later on as well. In fact, your creative writing abilities has inspired me to get my very own site now ;)”
    https://romantik69.co.il/נערות-ליווי-בחולון/

  32. EmeryCen March 13, 2021 at 12:12 am

    “Greetings! Very useful advice in this particular article! It is the little changes that make the largest changes. Many thanks for sharing!”
    נערות ליווי בתל אביב

  33. EmeryCen March 13, 2021 at 12:52 am

    “Next time I read a blog, Hopefully it doesn’t disappoint me just as much as this particular one. I mean, Yes, it was my choice to read through, nonetheless I actually believed you’d have something interesting to say. All I hear is a bunch of crying about something you could fix if you were not too busy searching for attention.”
    נערת ליווי פרטית

  34. EmeryCen March 13, 2021 at 5:54 am

    “A motivating discussion is definitely worth comment. I think that you should write more on this topic, it might not be a taboo matter but typically folks don’t talk about such topics. To the next! All the best!!”
    https://romantik69.co.il/נערות-ליווי-בלוד/

  35. EmeryCen March 13, 2021 at 10:25 am

    “Can I just say what a comfort to discover a person that genuinely understands what they’re talking about over the internet. You actually know how to bring a problem to light and make it important. A lot more people have to look at this and understand this side of the story. It’s surprising you aren’t more popular since you definitely have the gift.”
    נערות ליווי ברמלה

  36. EmeryCen March 13, 2021 at 11:10 am

    “Right here is the right website for anyone who would like to find out about this topic. You realize so much its almost tough to argue with you (not that I really would want toÖHaHa). You certainly put a brand new spin on a subject that’s been written about for ages. Wonderful stuff, just excellent!”
    נערות ליווי באשדוד

  37. EmeryCen March 13, 2021 at 4:47 pm

    “Nice post. I learn something new and challenging on websites I stumbleupon every day. It will always be useful to read through content from other writers and use something from their sites.”
    נערות ליווי בבת ים

  38. EmeryCen March 13, 2021 at 10:25 pm

    “When I initially left a comment I appear to have clicked on the -Notify me when new comments are added- checkbox and now each time a comment is added I get 4 emails with the same comment. There has to be an easy method you are able to remove me from that service? Thanks a lot!”
    נערות ליווי בחולון

  39. EmeryCen March 14, 2021 at 4:40 am

    “Can I simply just say what a relief to discover somebody who actually knows what they are discussing over the internet. You definitely understand how to bring a problem to light and make it important. A lot more people ought to look at this and understand this side of your story. It’s surprising you are not more popular because you definitely possess the gift.”
    https://romantik69.co.il/נערת-ליווי-פרטית/

  40. EmeryCen March 14, 2021 at 9:22 am

    “I’m excited to uncover this web site. I need to to thank you for ones time for this particularly fantastic read!! I definitely appreciated every little bit of it and I have you saved to fav to see new things on your website.”
    נערות ליווי בראשון לציון

  41. EmeryCen March 14, 2021 at 10:09 am

    “I’m very pleased to find this great site. I want to to thank you for your time for this fantastic read!! I definitely liked every part of it and I have you saved as a favorite to see new information on your web site.”
    https://romantik69.co.il/נערות-ליווי-במרכז/

  42. Jeffreytoise March 14, 2021 at 2:06 pm

    100mg viagra how much is viagra
    viagra without a doctor prescription usa

  43. Jeffreytoise March 15, 2021 at 1:16 pm

    viagra 100mg price mexican viagra
    100mg viagra

  44. xjbzglfeef March 22, 2021 at 5:08 am

    Muchas gracias. ?Como puedo iniciar sesion?

  45. ScottRorne March 30, 2021 at 12:29 pm

    https://zithromaxproff.com/# can i buy zithromax over the counter
    how to get zithromax over the counter

  46. ScottRorne March 31, 2021 at 2:22 pm

    https://zithromaxproff.com/# zithromax 500 mg lowest price drugstore online
    buy zithromax without presc

  47. ScottRorne April 3, 2021 at 11:30 am

    order cefixime online: noroxin price
    augmentin online

  48. 0mniartist April 8, 2021 at 4:12 am

    The other day, while I was at work, my sister stole
    my iPad and tested to see if it can survive a 30 foot
    drop, just so she can be a youtube sensation. My apple
    ipad is now destroyed and she has 83 views. I know this is totally off topic but I had
    to share it with someone! 0mniartist asmr

  49. asmr https://0mniartist.tumblr.com April 10, 2021 at 8:42 am

    I have been browsing on-line greater than three hours these days, but I by
    no means found any attention-grabbing article like
    yours. It is lovely price sufficient for me.
    Personally, if all web owners and bloggers made just right content material as you probably did,
    the web shall be a lot more useful than ever before.

    asmr 0mniartist

Leave a comment

Your email address will not be published. Required fields are marked *