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
  • Alan Ramos
    Alan Ramos
    6,617 Points

    Dot Notation

    Posted November 5, 2014 2:41am by Alan Ramos
    Alan Ramos
    6,617 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    2 Answers

  • Andrew Nguyen
    Andrew Nguyen
    2,470 Points

    Why do we use _prediction in the nil check instead of self.prediction?

    Posted September 21, 2014 8:07pm by Andrew Nguyen
    Andrew Nguyen
    2,470 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    1 Answer

  • Christopher Dyer
    Christopher Dyer
    3,634 Points

    In xcode6 beta, "_predictions" is an undeclared identifier, while self.predictions is ok. Could you please consider why?

    Posted September 18, 2014 3:27pm by Christopher Dyer
    Christopher Dyer
    3,634 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    1 Answer

  • Ben Myhre
    Ben Myhre
    28,726 Points

    How can I avoid "Implicit conversion loses integer precision" warning following Treehouse steps?

    Posted July 21, 2014 2:51pm by Ben Myhre
    Ben Myhre
    28,726 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    1 Answer

  • Joaquin Beltran
    PLUS
    Joaquin Beltran
    Courses Plus Student 6,784 Points

    _ vs. self

    Posted July 14, 2014 7:32am by Joaquin Beltran
    Joaquin Beltran
    Courses Plus Student 6,784 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    1 Answer

  • Lex Lawless
    Lex Lawless
    1,773 Points

    The instance variable _predictions is not recognized

    Posted July 10, 2014 3:53am by Lex Lawless
    Lex Lawless
    1,773 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    2 Answers

  • bronnyreinhardt
    bronnyreinhardt
    1,007 Points

    Defining (customising) a @property's getter method

    Posted June 24, 2014 7:52am by bronnyreinhardt
    bronnyreinhardt
    1,007 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    2 Answers

  • Jesse Reichenstein
    PLUS
    Jesse Reichenstein
    Courses Plus Student 1,595 Points

    Underscore used with variables

    Posted May 17, 2014 9:28pm by Jesse Reichenstein
    Jesse Reichenstein
    Courses Plus Student 1,595 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    2 Answers

  • Henry Ngan
    Henry Ngan
    3,592 Points

    About property, literals, instance and local variables

    Posted May 7, 2014 4:33pm by Henry Ngan
    Henry Ngan
    3,592 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    1 Answer

  • Aaron Eckhart
    Aaron Eckhart
    3,341 Points

    Invisible?

    Posted April 7, 2014 9:27pm by Aaron Eckhart
    Aaron Eckhart
    3,341 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    6 Answers

  • ivan akulov
    ivan akulov
    4,174 Points

    Clearly don't understand in what cases we use self.predictions and when _predictions

    Posted April 2, 2014 3:43am by ivan akulov
    ivan akulov
    4,174 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    7 Answers

  • tiago goncalves
    tiago goncalves
    1,912 Points

    Is it only me or.....

    Posted March 19, 2014 1:59am by tiago goncalves
    tiago goncalves
    1,912 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    7 Answers

  • Daniel Brooking
    Daniel Brooking
    5,164 Points

    Custom getter for @property vs init

    Posted March 13, 2014 9:11pm by Daniel Brooking
    Daniel Brooking
    5,164 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    2 Answers

  • Adrian Catuna
    Adrian Catuna
    2,092 Points

    MVC

    Posted March 10, 2014 7:25pm by Adrian Catuna
    Adrian Catuna
    2,092 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    1 Answer

  • Rosario Rascuna
    Rosario Rascuna
    363 Points

    getter method and self

    Posted March 2, 2014 7:06pm by Rosario Rascuna
    Rosario Rascuna
    363 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    1 Answer

  • Dustin Mordica
    Dustin Mordica
    7,871 Points

    Ivars using _ vs self

    Posted February 19, 2014 5:56pm by Dustin Mordica
    Dustin Mordica
    7,871 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    2 Answers

  • Shaun Johnson
    Shaun Johnson
    1,214 Points

    NSArray *_predictions;

    Posted February 14, 2014 3:51am by Shaun Johnson
    Shaun Johnson
    1,214 Points
    • iOS
    • Build a Simple iPhone App (iOS7)
    • Refactoring into a Model
    • Understanding @property

    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.