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
  • Joseph Quintiliano
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    Joseph Quintiliano
    Front End Web Development Techdegree Graduate 14,338 Points

    why would the substring parameters be (0, 3) and not (0, 2) if i only want to return the first three letters?

    Posted April 24, 2023 6:16pm by Joseph Quintiliano
    .a{fill-rule:evenodd;}techdegree seal-36
    Joseph Quintiliano
    Front End Web Development Techdegree Graduate 14,338 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    3 Answers

  • Ede Harrison
    Ede Harrison
    3,615 Points

    map() with template literals in JavaScript

    Posted September 29, 2022 11:40am by Ede Harrison
    Ede Harrison
    3,615 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Ronald Greer
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    Ronald Greer
    Front End Web Development Techdegree Graduate 56,430 Points

    Unsure how to abbreviate these values.

    Posted December 22, 2021 2:20pm by Ronald Greer
    .a{fill-rule:evenodd;}techdegree seal-36
    Ronald Greer
    Front End Web Development Techdegree Graduate 56,430 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Hanwen Zhang
    Hanwen Zhang
    20,084 Points

    Why My code is not working here :( Please help!!

    Posted April 3, 2021 3:47pm by Hanwen Zhang
    Hanwen Zhang
    20,084 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Oliver Duran
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    Oliver Duran
    Full Stack JavaScript Techdegree Graduate 22,828 Points

    How did you approach this challenge ?

    Posted October 1, 2020 5:59pm by Oliver Duran
    .a{fill-rule:evenodd;}techdegree seal-36
    Oliver Duran
    Full Stack JavaScript Techdegree Graduate 22,828 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Dwayne Bynum
    Dwayne Bynum
    10,408 Points

    daysOfWeek.map((day)=>{day.substr(0,4)}); Using the curly Braces do not work in any of the challenges WHY?

    Posted June 3, 2020 7:07pm by Dwayne Bynum
    Dwayne Bynum
    10,408 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Tadjiev Codes
    Tadjiev Codes
    9,626 Points

    Use the map method on the daysOfWeek array, creating a new array of abbreviated week days. Each abbreviated string shoul

    Posted April 7, 2020 10:00am by Tadjiev Codes
    Tadjiev Codes
    9,626 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    3 Answers

  • Haardik Gupta
    seal-mask
    .a{fill-rule:evenodd;}techdegree
    Haardik Gupta
    Full Stack JavaScript Techdegree Student 5,459 Points

    i'm confused

    Posted March 9, 2020 5:57pm by Haardik Gupta
    .a{fill-rule:evenodd;}techdegree
    Haardik Gupta
    Full Stack JavaScript Techdegree Student 5,459 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Christopher Evans
    Christopher Evans
    9,896 Points

    Cannot read property '2' of undefined.

    Posted February 24, 2020 5:20pm by Christopher Evans
    Christopher Evans
    9,896 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Joel Greek
    Joel Greek
    4,421 Points

    Bummer: Line 7: Unexpected token ILLEGAL in slice solution.

    Posted February 4, 2020 11:20am by Joel Greek
    Joel Greek
    4,421 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    2 Answers

  • Ewerton Luna
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    Ewerton Luna
    Full Stack JavaScript Techdegree Graduate 24,031 Points

    Could someone please help me pass this challenge?

    Posted September 7, 2019 7:10pm by Ewerton Luna
    .a{fill-rule:evenodd;}techdegree seal-36
    Ewerton Luna
    Full Stack JavaScript Techdegree Graduate 24,031 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Fredrick Adegoke
    Fredrick Adegoke
    1,983 Points

    when I try my code out in my work space it works, but on the challenge task editor it fails, and I am sure my code works

    Posted August 6, 2019 8:51pm by Fredrick Adegoke
    Fredrick Adegoke
    1,983 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Adam Arul
    Adam Arul
    13,757 Points

    The correct result is stored in `abbreviatedDays` but `map` was not used.

    Posted August 6, 2019 9:40am by Adam Arul
    Adam Arul
    13,757 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Khumoyunmirzo Nosirov
    Khumoyunmirzo Nosirov
    8,689 Points

    what is wrong here?

    Posted April 2, 2019 10:10am by Khumoyunmirzo Nosirov
    Khumoyunmirzo Nosirov
    8,689 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    2 Answers

  • Zak Mosbacher
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    Zak Mosbacher
    Full Stack JavaScript Techdegree Graduate 16,080 Points

    Something's not right. Output of `abbreviatedDays`: "Sat"

    Posted December 7, 2018 1:31am by Zak Mosbacher
    .a{fill-rule:evenodd;}techdegree seal-36
    Zak Mosbacher
    Full Stack JavaScript Techdegree Graduate 16,080 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Sam Costanzo
    seal-mask
    .a{fill-rule:evenodd;}techdegree
    Sam Costanzo
    Full Stack JavaScript Techdegree Student 16,379 Points

    I know this works but why can't I submit it? Is this a bug or am I missing something?

    Posted November 17, 2018 8:08pm by Sam Costanzo
    .a{fill-rule:evenodd;}techdegree
    Sam Costanzo
    Full Stack JavaScript Techdegree Student 16,379 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Humoyunmirzo Nosirov
    PLUS
    Humoyunmirzo Nosirov
    Courses Plus Student 5,154 Points

    NEED SOME HELP

    Posted August 28, 2018 3:47pm by Humoyunmirzo Nosirov
    Humoyunmirzo Nosirov
    Courses Plus Student 5,154 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    3 Answers

  • Ceil-Ian Maralit
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    Ceil-Ian Maralit
    Front End Web Development Techdegree Graduate 19,434 Points

    Abbreviation gone wrong.

    Posted August 21, 2018 9:02am by Ceil-Ian Maralit
    .a{fill-rule:evenodd;}techdegree seal-36
    Ceil-Ian Maralit
    Front End Web Development Techdegree Graduate 19,434 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

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

    help please

    Posted August 9, 2018 4:09pm 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
    • Array Manipulation
    • Practice map()

    1 Answer

  • Julien Arseneau
    seal-mask
    .a{fill-rule:evenodd;}techdegree
    Julien Arseneau
    Full Stack JavaScript Techdegree Student 5,200 Points

    How can I abbreviate a string?

    Posted July 23, 2018 6:31pm by Julien Arseneau
    .a{fill-rule:evenodd;}techdegree
    Julien Arseneau
    Full Stack JavaScript Techdegree Student 5,200 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    2 Answers

  • ammarkhan
    seal-mask
    .a{fill-rule:evenodd;}techdegree
    ammarkhan
    Front End Web Development Techdegree Student 21,661 Points

    Unable to pass the challenge because I changed the original code

    Posted March 18, 2018 11:41pm by ammarkhan
    .a{fill-rule:evenodd;}techdegree
    ammarkhan
    Front End Web Development Techdegree Student 21,661 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    1 Answer

  • Shafique Mohammed
    seal-mask
    .a{fill-rule:evenodd;}techdegree
    Shafique Mohammed
    Front End Web Development Techdegree Student 13,625 Points

    I need help with map method on the daysOfWeek array, I'm trying to create a new array with abbreviated weekdays.

    Posted November 19, 2017 12:58pm by Shafique Mohammed
    .a{fill-rule:evenodd;}techdegree
    Shafique Mohammed
    Front End Web Development Techdegree Student 13,625 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    2 Answers

  • Ioana Rusu
    Ioana Rusu
    9,599 Points

    Help with this code challenge :)

    Posted November 14, 2017 9:28pm by Ioana Rusu
    Ioana Rusu
    9,599 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    6 Answers

  • Victor Horton
    Victor Horton
    20,277 Points

    Says " The correct result is stored in `abbreviatedDays` but `map` was not used."

    Posted October 28, 2017 2:58pm by Victor Horton
    Victor Horton
    20,277 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    3 Answers

  • Nir Tal
    Nir Tal
    25,921 Points

    why this code is not the right answer??

    Posted October 26, 2017 7:36pm by Nir Tal
    Nir Tal
    25,921 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    2 Answers

  • Ian Hart
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    Ian Hart
    Full Stack JavaScript Techdegree Graduate 40,962 Points

    stuck on code challenge

    Posted October 26, 2017 12:45pm by Ian Hart
    .a{fill-rule:evenodd;}techdegree seal-36
    Ian Hart
    Full Stack JavaScript Techdegree Graduate 40,962 Points
    • JavaScript
    • JavaScript Array Iteration Methods
    • Array Manipulation
    • Practice map()

    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