AI can only take you so far. 🌟 Start with core skills in JavaScript, HTML, CSS, or Python. 🚀

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
      • • Vibe Coding
  • Sean Flanagan
    Sean Flanagan
    33,237 Points

    Duplicate parameters

    Posted February 3, 2018 10:45pm by Sean Flanagan
    Sean Flanagan
    33,237 Points
    • JavaScript
    • The JavaScript 'use strict' Statement

    2 Answers

  • Sean Flanagan
    Sean Flanagan
    33,237 Points

    Link to ES6 drafts times out

    Posted February 3, 2018 9:49pm by Sean Flanagan
    Sean Flanagan
    33,237 Points
    • JavaScript
    • The JavaScript 'use strict' Statement

    0 Answers

  • nfs
    nfs
    35,526 Points

    Do we need "use strict" in javascript files anymore?

    Posted December 22, 2017 4:58pm by nfs
    nfs
    35,526 Points
    • JavaScript
    • The JavaScript 'use strict' Statement

    2 Answers

  • Van Tran Huu
    Van Tran Huu
    16,694 Points

    Could I get the scripts in this video cuz I want to store them as reference?

    Posted December 13, 2016 3:22am by Van Tran Huu
    Van Tran Huu
    16,694 Points
    • JavaScript
    • The JavaScript 'use strict' Statement

    2 Answers

  • Sarah Saad
    PLUS
    Sarah Saad
    Courses Plus Student 3,223 Points

    'Strict Mode' catches the mistyped variable names in an assignment. How does the JavaScript Engine works it out?

    Posted May 17, 2016 8:48am by Sarah Saad
    Sarah Saad
    Courses Plus Student 3,223 Points
    • JavaScript
    • The JavaScript 'use strict' Statement

    2 Answers

  • Vivekanand Rao
    PLUS
    Vivekanand Rao
    Courses Plus Student 20,884 Points

    No Error in Chrome/Firefox Console for Duplicate named property in an object in strict mode.

    Posted December 8, 2015 7:48am by Vivekanand Rao
    Vivekanand Rao
    Courses Plus Student 20,884 Points
    • JavaScript
    • The JavaScript 'use strict' Statement

    3 Answers

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.