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

New No-Code Track! 🚀start learning today!

🌟 Dreaming of a bright future? 🎓 Ask about the Treehouse Scholarship program! 🚀

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

  • Treehouse Logo
  • Plans
    Chevron
    • For Individuals
    • For Businesses
    • For Schools
    • For Libraries
    • For Military
  • Library
    Chevron
    • All Courses
    • Tracks
    • College Credit
  • Techdegree
    Chevron
    • Overview
    • Front End Development
    • Full Stack JavaScript
    • Data Analysis
    • UX Design
    • Python
  • Community
    Chevron
    • Code Adventures
    • Discord
    • Forum
    • Success Stories
    • Treehouse Links
    • 100 Days of Code
  • Resources
    Chevron
    • Career Toolbox
    • CodeForward
    • Free Treehouse Near Me
    • Jobs
    • Blog
    • Support
    • About
  • For Individuals For Businesses For Schools For Libraries For Military
  • All Courses Tracks College Credit
  • Overview Front End Web Development Full Stack JavaScript Python Development Data Analysis UX Design
  • Code Adventures Discord Forum Success Stories Treehouse Links 100 Days of Code
  • Career Toolbox CodeForward Free Treehouse Near Me Jobs Blog Support About
  • Sign In
  • Free Trial
Instagram Twitter Facebook YouTube LinkedIn
    • Newest
      • Newest
      • Active
      • Unanswered
      • Featured
    • All Topics
      • All Topics
      • • General Discussion
      • • AI
      • • Android
      • • 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
  • Yanfei Yu
    Yanfei Yu
    4,259 Points

    Using arrow function leads to undefined result?

    Posted April 22, 2018 11:13pm by Yanfei Yu
    Yanfei Yu
    4,259 Points
    • JavaScript
    • Object-Oriented JavaScript (2015)
    • Introduction to Methods
    • Understanding this

    1 Answer

  • Natalie Cluer
    Natalie Cluer
    18,899 Points

    Not entirely correct?

    Posted January 28, 2018 1:27pm by Natalie Cluer
    Natalie Cluer
    18,899 Points
    • JavaScript
    • Object-Oriented JavaScript (2015)
    • Introduction to Methods
    • Understanding this

    3 Answers

  • Grace Ji
    Grace Ji
    5,402 Points

    Why did Andrew remove var when he move the 'var sides= 6' from out of the function?

    Posted June 5, 2017 4:50pm by Grace Ji
    Grace Ji
    5,402 Points
    • JavaScript
    • Object-Oriented JavaScript (2015)
    • Introduction to Methods
    • Understanding this

    1 Answer

  • Rita Bradley
    PLUS
    Rita Bradley
    Courses Plus Student 4,894 Points

    Arrow function returns NaN to console

    Posted April 3, 2017 10:49pm by Rita Bradley
    Rita Bradley
    Courses Plus Student 4,894 Points
    • JavaScript
    • Object-Oriented JavaScript (2015)
    • Introduction to Methods
    • Understanding this

    1 Answer

  • ruhullalam
    ruhullalam
    14,500 Points

    Why is there undefined coming up too?

    Posted January 9, 2017 12:40pm by ruhullalam
    ruhullalam
    14,500 Points
    • JavaScript
    • Object-Oriented JavaScript (2015)
    • Introduction to Methods
    • Understanding this

    1 Answer

  • Wilfredo Casas
    Wilfredo Casas
    6,174 Points

    What is the benefit of removing the var declarations from the method?

    Posted January 5, 2017 9:56pm by Wilfredo Casas
    Wilfredo Casas
    6,174 Points
    • JavaScript
    • Object-Oriented JavaScript (2015)
    • Introduction to Methods
    • Understanding this

    4 Answers

  • Dennis de Vries
    Dennis de Vries
    9,440 Points

    Understanding 'this': stuck at code challenge

    Posted August 9, 2015 8:19am by Dennis de Vries
    Dennis de Vries
    9,440 Points
    • JavaScript
    • Object-Oriented JavaScript (2015)
    • Introduction to Methods
    • Understanding this

    4 Answers

  • Emmanuel BLONVIA
    PLUS
    Emmanuel BLONVIA
    Courses Plus Student 696 Points

    Hello, When I assign dice.sides to 3, It happens that I get some randomNumber values greater that 3.

    Posted August 3, 2015 11:17am by Emmanuel BLONVIA
    Emmanuel BLONVIA
    Courses Plus Student 696 Points
    • JavaScript
    • Object-Oriented JavaScript (2015)
    • Introduction to Methods
    • Understanding this

    2 Answers

  • Martina Carrington
    PLUS
    Martina Carrington
    Courses Plus Student 15,807 Points

    dice.roll;

    Posted July 26, 2015 12:44am by Martina Carrington
    Martina Carrington
    Courses Plus Student 15,807 Points
    • JavaScript
    • Object-Oriented JavaScript (2015)
    • Introduction to Methods
    • Understanding this

    2 Answers

  • George Akinian
    George Akinian
    17,615 Points

    I need transcripts.

    Posted July 3, 2015 7:23pm by George Akinian
    George Akinian
    17,615 Points
    • JavaScript
    • Object-Oriented JavaScript (2015)
    • Introduction to Methods
    • Understanding this

    1 Answer

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

    Treehouse

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

See Full Catalogue

Techdegree

  • Front End Web Development
  • Full Stack JavaScript
  • Python Development
  • Data Analysis
  • UX Design

Tracks

  • Learn to Code for Beginners
  • Beginning Python
  • Beginning SQL
  • Beginning Java
  • ...see more

Courses

  • JavaScript Basics
  • Intro to HTML & CSS
  • Python Basics
  • CSS Layout
  • ...see more

Explore

  • Plans
  • Affiliates
  • Perks
  • Free Treehouse Near Me
  • Treehouse for Libraries
  • Treehouse for Businesses
  • Twitter
  • YouTube
  • Facebook
  • LinkedIn
  • Instagram
Terms & Conditions | Privacy

© 2025 Treehouse Island, Inc.