David Zhang

David Zhang

Paris, Paris, France

French Entrepreneur based in Paris. Always willing to learn and to build.

12,363

Total Points

Points are earned whenever you take an important action on Treehouse.
Learn more about when and how points are earned.

Skills & Experience

  • Spoken Languages

    • French
    • English
    • German
    • Chinese

169 Achievements

  • Achievement

    Putting it all Together

    Building Applications with React and Redux

    Achieved

    Feb 13, 2018

    Putting it all Together
  • Achievement

    Actions, Dispatch and Reducers. Oh my!

    Building Applications with React and Redux

    Achieved

    Feb 13, 2018

    Actions, Dispatch and Reducers. Oh my!
  • Achievement

    Modularizing the React Scoreboard Application

    Building Applications with React and Redux

    Achieved

    Feb 13, 2018

    Modularizing the React Scoreboard Application
  • Achievement

    Getting Started with Redux

    Building Applications with React and Redux

    Achieved

    Feb 13, 2018

    Getting Started with Redux
  • Achievement

    Going Further with Routing

    React Router 4 Basics

    Achieved

    Feb 10, 2018

    Going Further with Routing
  • Achievement

    Navigating, Nesting and Redirecting Routes

    React Router 4 Basics

    Achieved

    Feb 10, 2018

    Navigating, Nesting and Redirecting Routes
  • Achievement

    Getting Started with React Router

    React Router 4 Basics

    Achieved

    Feb 10, 2018

    Getting Started with React Router
  • Achievement

    Refining the App

    React by Example

    Achieved

    Feb 10, 2018

    Refining the App
  • Achievement

    Building the Application

    React by Example

    Achieved

    Feb 10, 2018

    Building the Application
  • Achievement

    Setting up with Create React App

    React by Example

    Achieved

    Feb 10, 2018

    Setting up with Create React App
  • Achievement

    Component Lifecycle

    React Basics (retired)

    Achieved

    Feb 9, 2018

    Component Lifecycle
  • Achievement

    Designing Dataflow

    React Basics (retired)

    Achieved

    Feb 9, 2018

    Designing Dataflow
  • Achievement

    Stateful Components

    React Basics (retired)

    Achieved

    Feb 9, 2018

    Stateful Components
  • Achievement

    Thinking in Components

    React Basics (retired)

    Achieved

    Feb 9, 2018

    Thinking in Components
  • Achievement

    First Steps in React

    React Basics (retired)

    Achieved

    Feb 9, 2018

    First Steps in React
  • Achievement

    Introducing SharedPreferences

    Android Activity Lifecycle

    Achieved

    Jun 16, 2016

    Introducing SharedPreferences
  • Achievement

    The Activity Lifecycle

    Android Activity Lifecycle

    Achieved

    Jun 15, 2016

    The Activity Lifecycle
  • Achievement

    Building the Weather UI

    Build a Weather App (2015)

    Achieved

    Mar 30, 2016

    Building the Weather UI
  • Achievement

    Working with JSON

    Build a Weather App (2015)

    Achieved

    Mar 30, 2016

    Working with JSON
  • Achievement

    Concurrency and Error Handling

    Build a Weather App (2015)

    Achieved

    Mar 29, 2016

    Concurrency and Error Handling
  • Achievement

    Networking

    Build a Weather App (2015)

    Achieved

    Mar 29, 2016

    Networking
  • Achievement

    Exploring an API

    Build a Weather App (2015)

    Achieved

    Mar 29, 2016

    Exploring an API
  • Achievement

    Finishing the User Interface

    Build an Interactive Story App (Retired)

    Achieved

    Mar 29, 2016

    Finishing the User Interface
  • Achievement

    The Model-View-Controller Pattern

    Build an Interactive Story App (Retired)

    Achieved

    Mar 28, 2016

    The Model-View-Controller Pattern
  • Achievement

    Intents and Multiple Activities

    Build an Interactive Story App (Retired)

    Achieved

    Mar 24, 2016

    Intents and Multiple Activities
  • Achievement

    User Input

    Build an Interactive Story App (Retired)

    Achieved

    Mar 23, 2016

    User Input
  • Achievement

    Testing and Debugging

    Build a Simple Android App

    Achieved

    Mar 19, 2016

    Testing and Debugging
  • Achievement

    Improving Our Code

    Build a Simple Android App

    Achieved

    Mar 19, 2016

    Improving Our Code
  • Achievement

    Basic Android Programming

    Build a Simple Android App

    Achieved

    Mar 18, 2016

    Basic Android Programming
  • Achievement

    Creating the Screen Layout

    Build a Simple Android App

    Achieved

    Mar 18, 2016

    Creating the Screen Layout
  • Achievement

    Getting Started with Android

    Build a Simple Android App

    Achieved

    Mar 12, 2016

    Getting Started with Android
  • Achievement

    Retrieving and Viewing Data from Parse.com

    Build a Self-Destructing Message iPhone App

    Achieved

    May 19, 2014

    Retrieving and Viewing Data from Parse.com
  • Achievement

    Capturing Photo and Video Using UIImagePickerController

    Build a Self-Destructing Message iPhone App

    Achieved

    May 14, 2014

    Capturing Photo and Video Using UIImagePickerController
  • Achievement

    Relating Users in Parse.com

    Build a Self-Destructing Message iPhone App

    Achieved

    May 12, 2014

    Relating Users in Parse.com
  • Achievement

    Using Parse.com as a Backend and Adding Users

    Build a Self-Destructing Message iPhone App

    Achieved

    May 11, 2014

    Using Parse.com as a Backend and Adding Users
  • Achievement

    Designing and Starting the App

    Build a Self-Destructing Message iPhone App

    Achieved

    May 9, 2014

    Designing and Starting the App
  • Achievement

    UIKit Dynamics

    Build a Photo Browser iPhone App

    Achieved

    May 8, 2014

    UIKit Dynamics
  • Achievement

    View Controller Transitions

    Build a Photo Browser iPhone App

    Achieved

    May 6, 2014

    View Controller Transitions
  • Achievement

    Cocoapods

    iOS Tools

    Achieved

    May 6, 2014

    Cocoapods
  • Achievement

    Gestures

    Build a Photo Browser iPhone App

    Achieved

    May 6, 2014

    Gestures
  • Achievement

    What is an API?

    Build a Photo Browser iPhone App

    Achieved

    May 4, 2014

    What is an API?
  • Achievement

    Downloading Data with NSURLSession

    Build a Photo Browser iPhone App

    Achieved

    May 4, 2014

    Downloading Data with NSURLSession
  • Achievement

    Collection Views

    Build a Photo Browser iPhone App

    Achieved

    May 3, 2014

    Collection Views
  • Achievement

    Testing and Debugging

    Build a Simple iPhone App (iOS7)

    Achieved

    May 2, 2014

    Testing and Debugging
  • Achievement

    Animate This (iOS7)

    Build a Simple iPhone App (iOS7)

    Achieved

    May 2, 2014

    Animate This (iOS7)
  • Achievement

    Designing your App

    Build a Simple iPhone App (iOS7)

    Achieved

    May 2, 2014

    Designing your App
  • Achievement

    Refactoring into a Model

    Build a Simple iPhone App (iOS7)

    Achieved

    Apr 30, 2014

    Refactoring into a Model
  • Achievement

    Creating a Data Collection

    Build a Simple iPhone App (iOS7)

    Achieved

    Apr 30, 2014

    Creating a Data Collection
  • Achievement

    Understanding Views and View Controllers

    Build a Simple iPhone App (iOS7)

    Achieved

    Apr 30, 2014

    Understanding Views and View Controllers
  • Achievement

    Getting Started (iOS7)

    Build a Simple iPhone App (iOS7)

    Achieved

    Apr 30, 2014

    Getting Started (iOS7)
  • Achievement

    Beyond the Basics

    Objective-C Basics (Retired)

    Achieved

    Apr 30, 2014

    Beyond the Basics
  • Achievement

    Advanced Objective-C

    Objective-C Basics (Retired)

    Achieved

    Apr 29, 2014

    Advanced Objective-C
  • Achievement

    Foundation Framework

    Objective-C Basics (Retired)

    Achieved

    Apr 29, 2014

    Foundation Framework
  • Achievement

    Introduction to Objective-C

    Objective-C Basics (Retired)

    Achieved

    Apr 29, 2014

    Introduction to Objective-C
  • Achievement

    Pointers and Memory

    Objective-C Basics (Retired)

    Achieved

    Apr 29, 2014

    Pointers and Memory
  • Achievement

    Functional Programming in C

    Objective-C Basics (Retired)

    Achieved

    Apr 29, 2014

    Functional Programming in C
  • Achievement

    Fundamentals of C

    Objective-C Basics (Retired)

    Achieved

    Apr 29, 2014

    Fundamentals of C
  • Achievement

    Adding State

    Building Social Features in Ruby on Rails

    Achieved

    Oct 16, 2013

    Adding State
  • Achievement

    Building the Friendship UI

    Building Social Features in Ruby on Rails

    Achieved

    Oct 15, 2013

    Building the Friendship UI
  • Achievement

    Creating Friendships

    Building Social Features in Ruby on Rails

    Achieved

    Oct 15, 2013

    Creating Friendships
  • Achievement

    Workflows

    Git Basics

    Achieved

    Oct 9, 2013

    Workflows
  • Achievement

    Working With Remote Repositories

    Git Basics

    Achieved

    Oct 9, 2013

    Working With Remote Repositories
  • Achievement

    Merging

    Git Basics

    Achieved

    Oct 9, 2013

    Merging
  • Achievement

    Branches

    Git Basics

    Achieved

    Oct 9, 2013

    Branches
  • Achievement

    Getting Started With Git

    Git Basics

    Achieved

    Oct 9, 2013

    Getting Started With Git
  • Achievement

    Why Version Control Matters

    Git Basics

    Achieved

    Oct 9, 2013

    Why Version Control Matters
  • Achievement

    Ruby Testing

    Ruby Foundations

    Achieved

    Oct 9, 2013

    Ruby Testing
  • Achievement

    Standard Library

    Ruby Foundations

    Achieved

    Oct 9, 2013

    Standard Library
  • Achievement

    Ruby Core

    Ruby Foundations

    Achieved

    Oct 9, 2013

    Ruby Core
  • Achievement

    Ruby Modules

    Ruby Foundations

    Achieved

    Oct 9, 2013

    Ruby Modules
  • Achievement

    Ruby Procs & Lambdas

    Ruby Foundations

    Achieved

    Oct 9, 2013

    Ruby Procs & Lambdas
  • Achievement

    Ruby Blocks

    Ruby Foundations

    Achieved

    Oct 9, 2013

    Ruby Blocks
  • Achievement

    Ruby Loops

    Ruby Foundations

    Achieved

    Oct 9, 2013

    Ruby Loops
  • Achievement

    Ruby Methods

    Ruby Foundations

    Achieved

    Oct 8, 2013

    Ruby Methods
  • Achievement

    Ruby Hashes

    Ruby Foundations

    Achieved

    Oct 8, 2013

    Ruby Hashes
  • Achievement

    Ruby Arrays

    Ruby Foundations

    Achieved

    Oct 8, 2013

    Ruby Arrays
  • Achievement

    Ruby Numbers

    Ruby Foundations

    Achieved

    Oct 8, 2013

    Ruby Numbers
  • Achievement

    Ruby Strings

    Ruby Foundations

    Achieved

    Oct 8, 2013

    Ruby Strings
  • Achievement

    Objects, Classes, and Variables

    Ruby Foundations

    Achieved

    Oct 8, 2013

    Objects, Classes, and Variables
  • Achievement

    Ruby Basics

    Ruby Foundations

    Achieved

    Oct 8, 2013

    Ruby Basics
  • Achievement

    Viewing a Web Page

    Build a Blog Reader iPhone App

    Achieved

    Oct 8, 2013

    Viewing a Web Page
  • Achievement

    Adapting Data for Display

    Build a Blog Reader iPhone App

    Achieved

    Oct 8, 2013

    Adapting Data for Display
  • Achievement

    Data Modeling

    Build a Blog Reader iPhone App

    Achieved

    Oct 8, 2013

    Data Modeling
  • Achievement

    Getting Data from the Web

    Build a Blog Reader iPhone App

    Achieved

    Oct 5, 2013

    Getting Data from the Web
  • Achievement

    Rebuilding from Scratch

    Build a Blog Reader iPhone App

    Achieved

    Oct 5, 2013

    Rebuilding from Scratch
  • Achievement

    Exploring the Master-Detail Template

    Build a Blog Reader iPhone App

    Achieved

    Oct 5, 2013

    Exploring the Master-Detail Template
  • Achievement

    Animate This

    Build a Simple iPhone App

    Achieved

    Oct 5, 2013

    Animate This
  • Achievement

    Shaking Things Up

    Build a Simple iPhone App

    Achieved

    Oct 4, 2013

    Shaking Things Up
  • Achievement

    Making It Pretty

    Build a Simple iPhone App

    Achieved

    Oct 4, 2013

    Making It Pretty
  • Achievement

    Learning the Language

    Build a Simple iPhone App

    Achieved

    Oct 4, 2013

    Learning the Language
  • Achievement

    Getting Started with iPhone

    Build a Simple iPhone App

    Achieved

    Oct 4, 2013

    Getting Started with iPhone
  • Achievement

    Installing Programs

    Console Foundations

    Achieved

    Oct 4, 2013

    Installing Programs
  • Achievement

    Environment and Redirection

    Console Foundations

    Achieved

    Oct 4, 2013

    Environment and Redirection
  • Achievement

    Console Processes

    Console Foundations

    Achieved

    Oct 4, 2013

    Console Processes
  • Achievement

    Console Users and Permission

    Console Foundations

    Achieved

    Oct 4, 2013

    Console Users and Permission
  • Achievement

    Moving Around in the Console

    Console Foundations

    Achieved

    Oct 4, 2013

    Moving Around in the Console
  • Achievement

    Self-Assessment

    Careers Foundations

    Achieved

    Sep 27, 2013

    Self-Assessment
  • Achievement

    Video Marketing

    How to Market Your Business

    Achieved

    Sep 27, 2013

    Video Marketing
  • Achievement

    Email Marketing

    How to Market Your Business

    Achieved

    Sep 27, 2013

    Email Marketing
  • Achievement

    Search Engine Optimization

    How to Market Your Business

    Achieved

    Sep 27, 2013

    Search Engine Optimization
  • Achievement

    Usability Testing

    How to Market Your Business

    Achieved

    Sep 27, 2013

    Usability Testing
  • Achievement

    Usability Basics

    How to Market Your Business

    Achieved

    Sep 27, 2013

    Usability Basics
  • Achievement

    Social Media

    How to Market Your Business

    Achieved

    Sep 27, 2013

    Social Media
  • Achievement

    Securing and Maintaining a MySQL Database

    Database Foundations

    Achieved

    Sep 27, 2013

    Securing and Maintaining a MySQL Database
  • Achievement

    SQL Calculating, Aggregating and Other Functions

    Database Foundations

    Achieved

    Sep 27, 2013

    SQL Calculating, Aggregating and Other Functions
  • Achievement

    Advanced Techniques

    Build a Responsive Website

    Achieved

    Sep 5, 2013

    Advanced Techniques
  • Achievement

    Responsive Design

    Build a Responsive Website

    Achieved

    Sep 5, 2013

    Responsive Design
  • Achievement

    Adaptive Design

    Build a Responsive Website

    Achieved

    Sep 5, 2013

    Adaptive Design
  • Achievement

    Fluid Foundation

    Build a Responsive Website

    Achieved

    Sep 5, 2013

    Fluid Foundation
  • Achievement

    Introduction to Responsive Web Design

    Build a Responsive Website

    Achieved

    Sep 5, 2013

    Introduction to Responsive Web Design
  • Achievement

    Media Queries

    Unused CSS Stages

    Achieved

    Jul 16, 2013

    Media Queries
  • Achievement

    Joining Relational Data Between Tables in SQL

    Database Foundations

    Achieved

    Jul 12, 2013

    Joining Relational Data Between Tables in SQL
  • Achievement

    Manipulating Schema with SQL

    Database Foundations

    Achieved

    Jul 12, 2013

    Manipulating Schema with SQL
  • Achievement

    Creating Tables and Manipulating Data with SQL

    Database Foundations

    Achieved

    Jul 12, 2013

    Creating Tables and Manipulating Data with SQL
  • Achievement

    Reading Data from Databases with SQL

    Database Foundations

    Achieved

    Jul 12, 2013

    Reading Data from Databases with SQL
  • Achievement

    Installing MySQL Server and MySQL Workbench

    Database Foundations

    Achieved

    Jul 12, 2013

    Installing MySQL Server and MySQL Workbench
  • Achievement

    Introduction to Data, Databases and SQL

    Database Foundations

    Achieved

    Jul 12, 2013

    Introduction to Data, Databases and SQL
  • Achievement

    CSS Animations

    Unused CSS Stages

    Achieved

    Jul 4, 2013

    CSS Animations
  • Achievement

    Gradients

    CSS Foundations

    Achieved

    Jul 4, 2013

    Gradients
  • Achievement

    Functions

    Introduction to Programming

    Achieved

    Jul 3, 2013

    Functions
  • Achievement

    Objects and Arrays

    Introduction to Programming

    Achieved

    Jul 3, 2013

    Objects and Arrays
  • Achievement

    Control Structures

    Introduction to Programming

    Achieved

    Jul 3, 2013

    Control Structures
  • Achievement

    Basics

    Introduction to Programming

    Achieved

    Jul 3, 2013

    Basics
  • Achievement

    Flexbox and Multi-Column Layout

    Unused CSS Stages

    Achieved

    Jul 3, 2013

    Flexbox and Multi-Column Layout
  • Achievement

    Transitions and Transforms

    Unused CSS Stages

    Achieved

    Jul 3, 2013

    Transitions and Transforms
  • Achievement

    Defining the Project

    UX Foundations

    Achieved

    Jul 3, 2013

    Defining the Project
  • Achievement

    Intro to User Experience

    UX Foundations

    Achieved

    Jul 3, 2013

    Intro to User Experience
  • Achievement

    Color Theory

    Aesthetic Foundations

    Achieved

    Jul 2, 2013

    Color Theory
  • Achievement

    Principles

    Aesthetic Foundations

    Achieved

    Jul 2, 2013

    Principles
  • Achievement

    Elements

    Aesthetic Foundations

    Achieved

    Jul 2, 2013

    Elements
  • Achievement

    jQuery Plugins

    Build an Interactive Website

    Achieved

    Jul 2, 2013

    jQuery Plugins
  • Achievement

    Form Validation and Manipulation

    Build an Interactive Website

    Achieved

    Jun 28, 2013

    Form Validation and Manipulation
  • Achievement

    Introduction to jQuery

    Build an Interactive Website

    Achieved

    Jun 28, 2013

    Introduction to jQuery
  • Achievement

    JavaScript Objects

    JavaScript Foundations

    Achieved

    Jun 28, 2013

    JavaScript Objects
  • Achievement

    JavaScript Functions

    JavaScript Foundations

    Achieved

    Jun 28, 2013

    JavaScript Functions
  • Achievement

    JavaScript Arrays

    JavaScript Foundations

    Achieved

    Jun 28, 2013

    JavaScript Arrays
  • Achievement

    JavaScript Numbers

    JavaScript Foundations

    Achieved

    Jun 28, 2013

    JavaScript Numbers
  • Achievement

    JavaScript Strings

    JavaScript Foundations

    Achieved

    Jun 28, 2013

    JavaScript Strings
  • Achievement

    Introduction Variables

    JavaScript Foundations

    Achieved

    Jun 28, 2013

    Introduction Variables
  • Achievement

    Web Typography

    CSS Foundations

    Achieved

    Jun 27, 2013

    Web Typography
  • Achievement

    Backgrounds and Borders

    CSS Foundations

    Achieved

    Jun 13, 2013

    Backgrounds and Borders
  • Achievement

    CSS Box Model

    CSS Foundations

    Achieved

    Jun 12, 2013

    CSS Box Model
  • Achievement

    Text, Fonts, and Lists

    CSS Foundations

    Achieved

    Jun 12, 2013

    Text, Fonts, and Lists
  • Achievement

    Values and Units

    CSS Foundations

    Achieved

    Jun 11, 2013

    Values and Units
  • Achievement

    Rails Deployment

    Build a Simple Ruby on Rails Application

    Achieved

    Jun 11, 2013

    Rails Deployment
  • Achievement

    Getting Started With Rails

    Build a Simple Ruby on Rails Application

    Achieved

    Jun 10, 2013

    Getting Started With Rails
  • Achievement

    Advanced Selectors

    CSS Foundations

    Achieved

    Jun 10, 2013

    Advanced Selectors
  • Achievement

    Selectors

    CSS Foundations

    Achieved

    Jun 10, 2013

    Selectors
  • Achievement

    Getting Started with CSS

    CSS Foundations

    Achieved

    Jun 10, 2013

    Getting Started with CSS
  • Achievement

    Forms

    HTML

    Achieved

    Jun 10, 2013

    Forms
  • Achievement

    Tables

    HTML

    Achieved

    Jun 10, 2013

    Tables
  • Achievement

    Objects

    HTML

    Achieved

    Jun 10, 2013

    Objects
  • Achievement

    Links

    HTML

    Achieved

    Jun 10, 2013

    Links
  • Achievement

    Lists

    HTML

    Achieved

    Jun 10, 2013

    Lists
  • Achievement

    Text

    HTML

    Achieved

    Jun 10, 2013

    Text
  • Achievement

    Introduction

    HTML

    Achieved

    Jun 10, 2013

    Introduction
  • Achievement

    Launching the Website

    Build a Simple Website

    Achieved

    Jun 10, 2013

    Launching the Website
  • Achievement

    Styling Content

    Build a Simple Website

    Achieved

    Jun 9, 2013

    Styling Content
  • Achievement

    Creating a Website Structure

    Build a Simple Website

    Achieved

    Jun 9, 2013

    Creating a Website Structure
  • Achievement

    Text Editors and HTML

    Build a Simple Website

    Achieved

    Jun 9, 2013

    Text Editors and HTML
  • Achievement

    Website Basics

    Build a Simple Website

    Achieved

    Jun 9, 2013

    Website Basics
  • Achievement

    Building the Profile Page

    Build a Simple Ruby on Rails Application

    Achieved

    Jun 8, 2013

    Building the Profile Page
  • Achievement

    Testing the Whole App

    Build a Simple Ruby on Rails Application

    Achieved

    Jun 7, 2013

    Testing the Whole App
  • Achievement

    Rails Routing

    Build a Simple Ruby on Rails Application

    Achieved

    Jun 7, 2013

    Rails Routing
  • Achievement

    Writing Tests

    Build a Simple Ruby on Rails Application

    Achieved

    Jun 7, 2013

    Writing Tests
  • Achievement

    Customizing Ruby on Rails Forms

    Build a Simple Ruby on Rails Application

    Achieved

    Jun 7, 2013

    Customizing Ruby on Rails Forms
  • Achievement

    Ruby on Rails Authentication

    Build a Simple Ruby on Rails Application

    Achieved

    Jun 7, 2013

    Ruby on Rails Authentication
  • Achievement

    Rails Frontend Development

    Build a Simple Ruby on Rails Application

    Achieved

    Jun 5, 2013

    Rails Frontend Development
  • Achievement

    Newbie

    Achieved

    Jun 5, 2013

    Newbie