Jason Tjahja

Jason Tjahja

Member Since June 24, 2016

8,668

Total Points

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116 Achievements

  • Achievement

    Downloading Album Artwork

    Build An iTunes Search App

    Achieved

    Dec 7, 2017

    Downloading Album Artwork
  • Achievement

    Requesting Real Data

    Build An iTunes Search App

    Achieved

    Dec 7, 2017

    Requesting Real Data
  • Achievement

    Enhancing the iTunes Endpoint

    Build An iTunes Search App

    Achieved

    Nov 27, 2017

    Enhancing the iTunes Endpoint
  • Achievement

    URLs and Parameter Encoding

    Build An iTunes Search App

    Achieved

    Nov 23, 2017

    URLs and Parameter Encoding
  • Achievement

    Building the User Interface

    Build An iTunes Search App

    Achieved

    Nov 14, 2017

    Building the User Interface
  • Achievement

    Modeling iTunes Search Results

    Build An iTunes Search App

    Achieved

    Nov 9, 2017

    Modeling iTunes Search Results
  • Achievement

    Deleting and Updating Data

    Introduction to Core Data

    Achieved

    Oct 20, 2017

    Deleting and Updating Data
  • Achievement

    Fetching Data Using Fetch Requests

    Introduction to Core Data

    Achieved

    Oct 15, 2017

    Fetching Data Using Fetch Requests
  • Achievement

    Downloading JSON Data Asynchronously

    Build a Weather App

    Achieved

    Sep 13, 2017

    Downloading JSON Data Asynchronously
  • Achievement

    Inserting and Saving Data Using a Context

    Introduction to Core Data

    Achieved

    Sep 11, 2017

    Inserting and Saving Data Using a Context
  • Achievement

    Understanding the Core Data Stack

    Introduction to Core Data

    Achieved

    Sep 9, 2017

    Understanding the Core Data Stack
  • Achievement

    Fetching Data From the Web

    Build a Weather App

    Achieved

    Sep 9, 2017

    Fetching Data From the Web
  • Achievement

    Modeling Forecast Data

    Build a Weather App

    Achieved

    Sep 4, 2017

    Modeling Forecast Data
  • Achievement

    Decoupling the Data Source

    Introduction to Table Views

    Achieved

    Aug 26, 2017

    Decoupling the Data Source
  • Achievement

    Sorting Contacts Into Sections

    Introduction to Table Views

    Achieved

    Aug 22, 2017

    Sorting Contacts Into Sections
  • Achievement

    Static Table Views for Detail Interfaces

    Introduction to Table Views

    Achieved

    Aug 20, 2017

    Static Table Views for Detail Interfaces
  • Achievement

    Displaying Contact Data

    Introduction to Table Views

    Achieved

    Aug 17, 2017

    Displaying Contact Data
  • Achievement

    A High Level Overview

    Introduction to Table Views

    Achieved

    Aug 14, 2017

    A High Level Overview
  • Achievement

    Inequalities, Content and Priorities

    Introduction to Auto Layout in iOS

    Achieved

    Jul 29, 2017

    Inequalities, Content and Priorities
  • Achievement

    The Constraint Equation

    Introduction to Auto Layout in iOS

    Achieved

    Jul 26, 2017

    The Constraint Equation
  • Achievement

    A History Lesson

    Introduction to Auto Layout in iOS

    Achieved

    Jul 25, 2017

    A History Lesson
  • Achievement

    Navigating Through An Adventure

    Build an Interactive Story App with Swift

    Achieved

    Jul 22, 2017

    Navigating Through An Adventure
  • Achievement

    Using the Delegate Pattern in iOS

    Delegation in iOS

    Achieved

    Jul 21, 2017

    Using the Delegate Pattern in iOS
  • Achievement

    Error Handling and Memory Management

    Closures in Swift

    Achieved

    Jul 20, 2017

    Error Handling and Memory Management
  • Achievement

    Building Standard Library Functions

    Closures in Swift

    Achieved

    Jul 19, 2017

    Building Standard Library Functions
  • Achievement

    Closure Expressions

    Closures in Swift

    Achieved

    Jul 18, 2017

    Closure Expressions
  • Achievement

    First Class Functions

    Closures in Swift

    Achieved

    Jul 17, 2017

    First Class Functions
  • Achievement

    Generics and Protocols

    Generics in Swift

    Achieved

    Jul 15, 2017

    Generics and Protocols
  • Achievement

    Generic Functions, Parameters and Constraints

    Generics in Swift

    Achieved

    Jul 12, 2017

    Generic Functions, Parameters and Constraints
  • Achievement

    The Delegate Pattern

    Delegation in iOS

    Achieved

    Jul 11, 2017

    The Delegate Pattern
  • Achievement

    Writing Great Swift

    API Design Guidelines in Swift

    Achieved

    Jul 10, 2017

    Writing Great Swift
  • Achievement

    Access Control

    Intermediate Swift

    Achieved

    Jul 7, 2017

    Access Control
  • Achievement

    Memory Management in Swift

    Intermediate Swift

    Achieved

    Jul 6, 2017

    Memory Management in Swift
  • Achievement

    Value Semantics, Type Methods and Inheritance

    Intermediate Swift

    Achieved

    Jul 5, 2017

    Value Semantics, Type Methods and Inheritance
  • Achievement

    Object Initialization

    Intermediate Swift

    Achieved

    Jun 21, 2017

    Object Initialization
  • Achievement

    Properties

    Intermediate Swift

    Achieved

    Jun 20, 2017

    Properties
  • Achievement

    Loading Data From a Resource

    Build a Vending Machine App in Swift

    Achieved

    Jun 20, 2017

    Loading Data From a Resource
  • Achievement

    Modeling an Interface

    Build a Vending Machine App in Swift

    Achieved

    Jun 19, 2017

    Modeling an Interface
  • Achievement

    Error Handling

    Error Handling in Swift

    Achieved

    Jun 19, 2017

    Error Handling
  • Achievement

    Creating Flexible Objects Using Protocols

    Protocols in Swift

    Achieved

    Jun 18, 2017

    Creating Flexible Objects Using Protocols
  • Achievement

    Protocol Basics

    Protocols in Swift

    Achieved

    Jun 16, 2017

    Protocol Basics
  • Achievement

    Objects and Optionals

    Enumerations and Optionals in Swift

    Achieved

    Jun 15, 2017

    Objects and Optionals
  • Achievement

    Introduction to Optionals

    Enumerations and Optionals in Swift

    Achieved

    Jun 14, 2017

    Introduction to Optionals
  • Achievement

    Running Apps on a Device

    Build a Simple iPhone App with Swift

    Achieved

    Jun 12, 2017

    Running Apps on a Device
  • Achievement

    Improving Our User Interface

    Build a Simple iPhone App with Swift

    Achieved

    Jun 12, 2017

    Improving Our User Interface
  • Achievement

    Structs As Data Models

    Build a Simple iPhone App with Swift

    Achieved

    Jun 9, 2017

    Structs As Data Models
  • Achievement

    View Controllers and Views

    Build a Simple iPhone App with Swift

    Achieved

    Jun 8, 2017

    View Controllers and Views
  • Achievement

    Classes in Swift

    Object-Oriented Swift

    Achieved

    Jun 5, 2017

    Classes in Swift
  • Achievement

    Differentiating Between Objects

    Object-Oriented Swift

    Achieved

    Jun 5, 2017

    Differentiating Between Objects
  • Achievement

    Class Inheritance

    Object-Oriented Swift

    Achieved

    Jun 5, 2017

    Class Inheritance
  • Achievement

    Complex Data Structures

    Object-Oriented Swift

    Achieved

    Jun 3, 2017

    Complex Data Structures
  • Achievement

    Adding Power to Functions

    Functions in Swift

    Achieved

    Jun 2, 2017

    Adding Power to Functions
  • Achievement

    Functions in Swift

    Functions in Swift

    Achieved

    Jun 2, 2017

    Functions in Swift
  • Achievement

    Control Flow With Loops

    Swift Collections and Control Flow

    Achieved

    May 31, 2017

    Control Flow With Loops
  • Achievement

    Dictionaries in Swift

    Swift Collections and Control Flow

    Achieved

    May 31, 2017

    Dictionaries in Swift
  • Achievement

    Introduction to Collections

    Swift Collections and Control Flow

    Achieved

    May 31, 2017

    Introduction to Collections
  • Achievement

    Swift Operators

    Swift Basics

    Achieved

    May 31, 2017

    Swift Operators
  • Achievement

    An Introduction to Swift Programming

    Swift Basics

    Achieved

    May 31, 2017

    An Introduction to Swift Programming
  • Achievement

    Adding the UI

    Kotlin and Anko

    Achieved

    May 4, 2017

    Adding the UI
  • Achievement

    Learning Anko

    Kotlin and Anko

    Achieved

    May 1, 2017

    Learning Anko
  • Achievement

    Is This Thing On?

    Kotlin for Java Developers

    Achieved

    Apr 27, 2017

    Is This Thing On?
  • Achievement

    Putting It All Together

    Kotlin for Java Developers

    Achieved

    Apr 26, 2017

    Putting It All Together
  • Achievement

    Modelling Solitaire

    Kotlin for Java Developers

    Achieved

    Apr 23, 2017

    Modelling Solitaire
  • Achievement

    Hello Kotlin!

    Kotlin for Java Developers

    Achieved

    Apr 19, 2017

    Hello Kotlin!
  • Achievement

    Adding Play Services to Your App

    Google Play Services

    Achieved

    Nov 8, 2016

    Adding Play Services to Your App
  • Achievement

    Migrating a SQLite Database

    Android Data Persistence

    Achieved

    Nov 7, 2016

    Migrating a SQLite Database
  • Achievement

    CRUD Operations with SQLite

    Android Data Persistence

    Achieved

    Nov 5, 2016

    CRUD Operations with SQLite
  • Achievement

    Using SQLite for Structured Data

    Android Data Persistence

    Achieved

    Oct 11, 2016

    Using SQLite for Structured Data
  • Achievement

    Key-Value Saving with SharedPreferences

    Android Data Persistence

    Achieved

    Oct 9, 2016

    Key-Value Saving with SharedPreferences
  • Achievement

    File Storage

    Android Data Persistence

    Achieved

    Oct 9, 2016

    File Storage
  • Achievement

    Introduction to Data Persistence

    Android Data Persistence

    Achieved

    Oct 6, 2016

    Introduction to Data Persistence
  • Achievement

    Activity Transitions: Advanced Topics

    Animations and Transitions

    Achieved

    Oct 5, 2016

    Activity Transitions: Advanced Topics
  • Achievement

    Shared Element Transitions

    Animations and Transitions

    Achieved

    Oct 4, 2016

    Shared Element Transitions
  • Achievement

    Transitions Framework

    Animations and Transitions

    Achieved

    Oct 4, 2016

    Transitions Framework
  • Achievement

    Tablet Time

    Android Fragments

    Achieved

    Sep 29, 2016

    Tablet Time
  • Achievement

    Ingredients and Directions

    Android Fragments

    Achieved

    Sep 29, 2016

    Ingredients and Directions
  • Achievement

    Managing Fragments

    Android Fragments

    Achieved

    Sep 26, 2016

    Managing Fragments
  • Achievement

    Introducing Fragments

    Android Fragments

    Achieved

    Sep 24, 2016

    Introducing Fragments
  • Achievement

    The Project

    Android Activity Lifecycle

    Achieved

    Sep 22, 2016

    The Project
  • Achievement

    Swift Types

    Swift 2.0 Basics

    Achieved

    Sep 19, 2016

    Swift Types
  • Achievement

    Introducing SharedPreferences

    Android Activity Lifecycle

    Achieved

    Sep 19, 2016

    Introducing SharedPreferences
  • Achievement

    The Activity Lifecycle

    Android Activity Lifecycle

    Achieved

    Sep 17, 2016

    The Activity Lifecycle
  • Achievement

    An Introduction to Swift Programming

    Swift 2.0 Basics

    Achieved

    Sep 15, 2016

    An Introduction to Swift Programming
  • Achievement

    Acting on List Item Taps

    Android Lists and Adapters (2015)

    Achieved

    Sep 15, 2016

    Acting on List Item Taps
  • Achievement

    Lists with RecyclerViews

    Android Lists and Adapters (2015)

    Achieved

    Sep 13, 2016

    Lists with RecyclerViews
  • Achievement

    Using Parcelable Data

    Android Lists and Adapters (2015)

    Achieved

    Sep 12, 2016

    Using Parcelable Data
  • Achievement

    Custom ListViews

    Android Lists and Adapters (2015)

    Achieved

    Sep 11, 2016

    Custom ListViews
  • Achievement

    Standard ListViews

    Android Lists and Adapters (2015)

    Achieved

    Sep 9, 2016

    Standard ListViews
  • Achievement

    Updating the Data Model

    Android Lists and Adapters (2015)

    Achieved

    Sep 9, 2016

    Updating the Data Model
  • Achievement

    Animation Basics

    Animations and Transitions

    Achieved

    Aug 27, 2016

    Animation Basics
  • Achievement

    Hooking up the Model to the View

    Build a Weather App (2015)

    Achieved

    Aug 22, 2016

    Hooking up the Model to the View
  • Achievement

    Building the Weather UI

    Build a Weather App (2015)

    Achieved

    Aug 19, 2016

    Building the Weather UI
  • Achievement

    Working with JSON

    Build a Weather App (2015)

    Achieved

    Aug 19, 2016

    Working with JSON
  • Achievement

    Concurrency and Error Handling

    Build a Weather App (2015)

    Achieved

    Aug 15, 2016

    Concurrency and Error Handling
  • Achievement

    Networking

    Build a Weather App (2015)

    Achieved

    Aug 13, 2016

    Networking
  • Achievement

    Exploring an API

    Build a Weather App (2015)

    Achieved

    Aug 13, 2016

    Exploring an API
  • Achievement

    Finishing the User Interface

    Build an Interactive Story App (Retired)

    Achieved

    Aug 13, 2016

    Finishing the User Interface
  • Achievement

    The Model-View-Controller Pattern

    Build an Interactive Story App (Retired)

    Achieved

    Aug 6, 2016

    The Model-View-Controller Pattern
  • Achievement

    Intents and Multiple Activities

    Build an Interactive Story App (Retired)

    Achieved

    Aug 5, 2016

    Intents and Multiple Activities
  • Achievement

    User Input

    Build an Interactive Story App (Retired)

    Achieved

    Aug 3, 2016

    User Input
  • Achievement

    Testing and Debugging

    Build a Simple Android App

    Achieved

    Aug 2, 2016

    Testing and Debugging
  • Achievement

    Improving Our Code

    Build a Simple Android App

    Achieved

    Jul 28, 2016

    Improving Our Code
  • Achievement

    Basic Android Programming

    Build a Simple Android App

    Achieved

    Jul 28, 2016

    Basic Android Programming
  • Achievement

    Creating the Screen Layout

    Build a Simple Android App

    Achieved

    Jul 27, 2016

    Creating the Screen Layout
  • Achievement

    Getting Started with Android

    Build a Simple Android App

    Achieved

    Jul 26, 2016

    Getting Started with Android
  • Achievement

    Writing Your Own Java Annotation

    Java Annotations

    Achieved

    Jul 25, 2016

    Writing Your Own Java Annotation
  • Achievement

    Using Java's Built-In Annotations

    Java Annotations

    Achieved

    Jul 21, 2016

    Using Java's Built-In Annotations
  • Achievement

    Efficiency!

    Java Data Structures

    Achieved

    Jul 19, 2016

    Efficiency!
  • Achievement

    Exploring the Java Collections Framework

    Java Data Structures

    Achieved

    Jul 12, 2016

    Exploring the Java Collections Framework
  • Achievement

    Organizing Data

    Java Data Structures

    Achieved

    Jul 2, 2016

    Organizing Data
  • Achievement

    Getting There

    Java Data Structures

    Achieved

    Jun 30, 2016

    Getting There
  • Achievement

    Delivering the MVP

    Java Objects (Retired)

    Achieved

    Jun 27, 2016

    Delivering the MVP
  • Achievement

    Creating the MVP

    Java Objects (Retired)

    Achieved

    Jun 25, 2016

    Creating the MVP
  • Achievement

    Harnessing the Power of Objects

    Java Objects (Retired)

    Achieved

    Jun 24, 2016

    Harnessing the Power of Objects
  • Achievement

    Meet Objects

    Java Objects (Retired)

    Achieved

    Jun 24, 2016

    Meet Objects
  • Achievement

    Newbie

    Achieved

    Jun 24, 2016

    Newbie