Skip to main content

Notice: Workspaces are undergoing maintenance and are temporarily unavailable.

🚀 In our NEW AI Bootcamp you'll build a working app in 28 days, no experience required. Free to all subscription levels.

✨ Earn college credits in Cybersecurity, JS, HTML, CSS and Python

Join the Treehouse affiliate program and earn 25% recurring commission! 🤑

  • Treehouse Logo
    • For Individuals
    • For Businesses
    • For Schools
    • For Libraries
    • For Military
    • All Courses
    • Tracks
    • AI Bootcamp
    • College Credit
    • Techdegree Bootcamps
    • Front End Development
    • Full Stack JavaScript
    • Code Adventures
    • Discord
    • Forum
    • Success Stories
    • Treehouse Links
    • 100 Days of Code
    • Explore
    • Career Toolbox
    • Free Treehouse Near Me
    • Affiliates
    • Blog
    • Support
    • About
    • Learn
    • Beginner's Guide to Coding
    • Data Analysis with SQL & Python
    • Front-End Web Development
    • Python Programming Basics
    • Techdegree Bootcamp Overview
    • UX Design Fundamentals
    • AI Tools for Beginners
  • For Individuals For Businesses For Schools For Libraries For Military
  • All Courses Tracks AI Bootcamp College Credit
  • Techdegree Bootcamps Front End Web Development Full Stack JavaScript
  • Code Adventures Discord Forum Success Stories Treehouse Links 100 Days of Code
  • Explore Career Toolbox Free Treehouse Near Me Affiliates Blog Support About
    Learn Beginner's Guide to Coding Data Analysis with SQL & Python Front-End Web Development Python Programming Basics Techdegree Bootcamp Overview UX Design Fundamentals AI Tools for Beginners
  • Sign In
  • Free Trial
Instagram Twitter Facebook YouTube LinkedIn
Loading banner... Start your free trial at Treehouse
    • Newest
      • Newest
      • Active
      • Unanswered
      • Featured
    • All Topics
      • All Topics
      • • General Discussion
      • • AI
      • • APIs
      • • Coding for Kids
      • • College Credit
      • • Computer Science
      • • CSS
      • • Data Analysis
      • • Databases
      • • Design
      • • Development Tools
      • • Digital Literacy
      • • Game Development
      • • Go Language
      • • HTML
      • • Java
      • • JavaScript
      • • Learning Resources
      • • Machine Learning
      • • No-Code
      • • PHP
      • • Professional Growth
      • • Python
      • • Quality Assurance
      • • React
      • • Ruby
      • • Security
      • • Swift
      • • Vibe Coding
  • Samuel Kleos
    seal-mask
    .a{fill-rule:evenodd;}techdegree
    Samuel Kleos
    Front End Web Development Techdegree Student 13,728 Points

    What if... 🤔 these two methods are the same. Then is it true .reduce() is just performing a variable assignment?

    Posted February 22, 2023 4:48am by Samuel Kleos
    .a{fill-rule:evenodd;}techdegree
    Samuel Kleos
    Front End Web Development Techdegree Student 13,728 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    1 Answer

  • Emil Lau
    Emil Lau
    6,233 Points

    userObject is not defined

    Posted July 31, 2022 8:34am by Emil Lau
    Emil Lau
    6,233 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    1 Answer

  • Nnanna Okoli
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    Nnanna Okoli
    Front End Web Development Techdegree Graduate 19,181 Points

    Why does this method I used does not work, help me understand more please?

    Posted March 20, 2022 11:16am by Nnanna Okoli
    .a{fill-rule:evenodd;}techdegree seal-36
    Nnanna Okoli
    Front End Web Development Techdegree Graduate 19,181 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    2 Answers

  • karan Badhwar
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    karan Badhwar
    Web Development Techdegree Graduate 18,136 Points

    Help me understand this example. please

    Posted February 4, 2022 7:07am by karan Badhwar
    .a{fill-rule:evenodd;}techdegree seal-36
    karan Badhwar
    Web Development Techdegree Graduate 18,136 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    1 Answer

  • Frank keane
    Frank keane
    8,074 Points

    Why is return necessary here?

    Posted June 18, 2021 1:31pm by Frank keane
    Frank keane
    8,074 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    1 Answer

  • Federico Lemaire
    Federico Lemaire
    8,423 Points

    Reduce Method doubt.

    Posted April 22, 2020 2:33am by Federico Lemaire
    Federico Lemaire
    8,423 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    3 Answers

  • Umidjon Khaitov
    Umidjon Khaitov
    8,884 Points

    Why user.name and user[name] are not same in these conditions?

    Posted August 27, 2019 11:08pm by Umidjon Khaitov
    Umidjon Khaitov
    8,884 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    1 Answer

  • Scott Wells
    Scott Wells
    8,715 Points

    I though .reduce(); made a new array, not a new object?

    Posted December 7, 2018 6:10pm by Scott Wells
    Scott Wells
    8,715 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    1 Answer

  • Peter Retvari
    seal-mask
    .a{fill-rule:evenodd;}techdegree
    Peter Retvari
    Full Stack JavaScript Techdegree Student 8,392 Points

    Maybe it's not a proper way, but it's shorter and you got the same result

    Posted August 28, 2018 1:18pm by Peter Retvari
    .a{fill-rule:evenodd;}techdegree
    Peter Retvari
    Full Stack JavaScript Techdegree Student 8,392 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    2 Answers

  • Daniel Benisti
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    Daniel Benisti
    Front End Web Development Techdegree Graduate 22,224 Points

    why using []

    Posted August 25, 2018 9:10am by Daniel Benisti
    .a{fill-rule:evenodd;}techdegree seal-36
    Daniel Benisti
    Front End Web Development Techdegree Graduate 22,224 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    2 Answers

  • Kahriq Chatmon
    Kahriq Chatmon
    8,694 Points

    Arrow function syntax

    Posted June 22, 2018 3:59pm by Kahriq Chatmon
    Kahriq Chatmon
    8,694 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    1 Answer

  • andreasantecki
    andreasantecki
    12,577 Points

    Can someone explain the .reduce method from this video please?

    Posted May 11, 2018 8:54am by andreasantecki
    andreasantecki
    12,577 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    2 Answers

  • Clayton Knight
    Clayton Knight
    810 Points

    Template literals

    Posted November 10, 2017 10:55pm by Clayton Knight
    Clayton Knight
    810 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Combining Array Methods
    • Working with Objects in Arrays

    2 Answers

Posting to the forum is only allowed for members with active accounts.
Please sign in or sign up to post.

Techdegree

  • Front End Web Development
  • Full Stack JavaScript
SEE ALL

Tracks

  • Learn to Code for Beginners
  • Beginning Python
  • Beginning SQL
  • Beginning Java
SEE ALL

Courses

  • JavaScript Basics
  • Intro to HTML & CSS
  • Python Basics
  • CSS Layout
SEE ALL

About Us

  • About
  • Blog
  • Community
  • Stories
  • Contact
  • Gift Card

Explore

  • Plans
  • Affiliates
  • Perks
  • Shop
  • Free Treehouse Near Me
  • Treehouse for Libraries
  • Treehouse for Businesses

Treehouse is an online technology education platform founded in 2011. Treehouse offers more than 700 self-paced, video-based courses in web development, programming, data analysis, design, and AI, plus two project-based bootcamp programs in Front End Web Development and Full Stack JavaScript. Individual Treehouse plans start at $25 per month and include a 7-day free trial. Treehouse serves individual learners, businesses, schools, and public libraries. Cardholders at participating U.S. public libraries can use Treehouse for free. Select Treehouse courses, offered with University Pathways International, are recommended for college credit by ACE and NCCRS. Treehouse learners earn digital certificates for completed Tracks.

Terms & Conditions · Privacy · © 2026 Treehouse Island, Inc.
  • Twitter
  • YouTube
  • Facebook
  • LinkedIn
  • Instagram
  • Discord