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Pieter Middeldorp

Member Since July 20, 2017

10,460

Total Points

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5,170

JavaScript

5170 pts
Achievements

0 pts
Forum
•
1,522

CSS

1522 pts
Achievements

0 pts
Forum
•
1,132

HTML

1132 pts
Achievements

0 pts
Forum
•
724

Development Tools

724 pts
Achievements

0 pts
Forum
•
614

PHP

614 pts
Achievements

0 pts
Forum
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73

Design

73 pts
Achievements

0 pts
Forum
•
40

Digital Literacy

40 pts
Achievements

0 pts
Forum
•
7

Java

7 pts
Achievements

0 pts
Forum

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

132 Achievements

Achievement
Introduction to Node.js

Node.js Basics 2017

Achieved
Oct 2, 2020
Achievement
Adding the Game Logic

Object-Oriented JavaScript: Challenge

Achieved
Oct 2, 2020
Achievement
Making the Game Interactive

Object-Oriented JavaScript: Challenge

Achieved
Oct 2, 2020
Achievement
Rendering the Game

Object-Oriented JavaScript: Challenge

Achieved
Oct 2, 2020
Achievement
Building Constructor Methods and Generating Objects

Object-Oriented JavaScript: Challenge

Achieved
Oct 2, 2020
Achievement
Introducing 'Four in a Row'

Object-Oriented JavaScript: Challenge

Achieved
Oct 2, 2020
Achievement
Loop Through Objects

JavaScript Objects

Achieved
Oct 1, 2020
Achievement
Object Basics

JavaScript Objects

Achieved
Oct 1, 2020
Achievement
Multidimensional Arrays

JavaScript Arrays

Achieved
Oct 1, 2020
Achievement
Loop Through Arrays

JavaScript Arrays

Achieved
Oct 1, 2020
Achievement
Store Multiple Values in an Array

JavaScript Arrays

Achieved
Sep 28, 2020
Achievement
Working with 'for' Loops

JavaScript Loops

Achieved
Sep 28, 2020
Achievement
Simplify Repetitive Tasks with Loops

JavaScript Loops

Achieved
Sep 23, 2020
Achievement
Stateful Components

React Basics (2018)

Achieved
Sep 23, 2020
Achievement
Introducing Props

React Basics (2018)

Achieved
Sep 8, 2020
Achievement
Thinking in Components

React Basics (2018)

Achieved
Sep 7, 2020
Achievement
First Steps in React

React Basics (2018)

Achieved
Sep 7, 2020
Achievement
Array Manipulation

JavaScript Array Iteration Methods

Achieved
Sep 4, 2020
Achievement
Array Iteration

JavaScript Array Iteration Methods

Achieved
Sep 4, 2020
Achievement
PHP Arrays

PHP Arrays and Control Structures

Achieved
Apr 21, 2020
Achievement
PHP Conditionals

PHP Arrays and Control Structures

Achieved
Apr 20, 2020
Achievement
PHP on the Web

PHP Basics

Achieved
Apr 20, 2020
Achievement
Daily Exercise Program

PHP Basics

Achieved
Apr 20, 2020
Achievement
Unit Converter

PHP Basics

Achieved
Apr 20, 2020
Achievement
Getting to Know PHP

PHP Basics

Achieved
Apr 20, 2020
Achievement
Chrome DevTools Basics

Website Optimization

Achieved
Apr 20, 2020
Achievement
Testing for Accessibility

Web Accessibility Compliance

Achieved
Apr 19, 2020
Achievement
Mobile Accessibility

Web Accessibility Compliance

Achieved
Apr 19, 2020
Achievement
Accessible UI Patterns

Web Accessibility Compliance

Achieved
Apr 19, 2020
Achievement
Semantic HTML and WAI-ARIA

Web Accessibility Compliance

Achieved
Apr 14, 2020
Achievement
WCAG 2.0 (and Other Standards)

Web Accessibility Compliance

Achieved
Apr 14, 2020
Achievement
Access for Everybody

Web Accessibility Compliance

Achieved
Apr 14, 2020
Achievement
Getters and Setters

Object-Oriented JavaScript

Achieved
Apr 14, 2020
Achievement
Working with Classes in JavaScript

Object-Oriented JavaScript

Achieved
Apr 13, 2020
Achievement
Object Basics

Object-Oriented JavaScript

Achieved
Apr 13, 2020
Achievement
Introduction to Object-Oriented JavaScript

Object-Oriented JavaScript

Achieved
Apr 13, 2020
Achievement
Exploring Async/Await

Asynchronous Programming with JavaScript

Achieved
Apr 13, 2020
Achievement
Understanding Promises

Asynchronous Programming with JavaScript

Achieved
Apr 11, 2020
Achievement
Asynchronous JavaScript with Callbacks

Asynchronous Programming with JavaScript

Achieved
Apr 6, 2020
Achievement
Captioning Video

HTML Video and Audio

Achieved
Apr 6, 2020
Achievement
Media Basics

HTML Video and Audio

Achieved
Apr 6, 2020
Achievement
Structuring Tables

HTML Tables

Achieved
Apr 6, 2020
Achievement
Table Basics

HTML Tables

Achieved
Apr 6, 2020
Achievement
Callbacks and the DOM

Callback Functions in JavaScript

Achieved
Apr 6, 2020
Achievement
Callbacks with Timers

Callback Functions in JavaScript

Achieved
Apr 6, 2020
Achievement
Introduction to Callback Functions

Callback Functions in JavaScript

Achieved
Apr 6, 2020
Achievement
What is Asynchronous Programming?

Asynchronous Programming with JavaScript

Achieved
Apr 6, 2020
Achievement
Combine and Minify Assets

Introduction to Front End Performance Optimization

Achieved
Apr 5, 2020
Achievement
Optimize Assets

Introduction to Front End Performance Optimization

Achieved
Apr 5, 2020
Achievement
Measuring Performance

Introduction to Front End Performance Optimization

Achieved
Apr 5, 2020
Achievement
Planning for Performance

Introduction to Front End Performance Optimization

Achieved
Apr 5, 2020
Achievement
Building Forms With Bootstrap

Bootstrap Basics

Achieved
Apr 5, 2020
Achievement
Using Bootstrap Components

Bootstrap Basics

Achieved
Apr 5, 2020
Achievement
Responsive Layouts With the Bootstrap Grid

Bootstrap Basics

Achieved
Apr 5, 2020
Achievement
Getting to Know Bootstrap 4

Bootstrap Basics

Achieved
Apr 5, 2020
Achievement
Advanced Selectors

CSS Selectors

Achieved
Apr 5, 2020
Achievement
Going Further with Attribute Selectors and Pseudo-Classes

CSS Selectors

Achieved
Apr 4, 2020
Achievement
Selectors - Beyond the Basics

CSS Selectors

Achieved
Apr 4, 2020
Achievement
Choosing Options

HTML Forms

Achieved
Apr 4, 2020
Achievement
Organizing Forms

HTML Forms

Achieved
Apr 4, 2020
Achievement
Form Basics

HTML Forms

Achieved
Apr 4, 2020
Achievement
Building a Layout with Flexbox

CSS Flexbox Layout

Achieved
Apr 4, 2020
Achievement
Flexbox Properties

CSS Flexbox Layout

Achieved
Apr 4, 2020
Achievement
Understanding Flexbox

CSS Flexbox Layout

Achieved
Apr 4, 2020
Achievement
Responsive Patterns

Responsive Layouts

Achieved
Apr 4, 2020
Achievement
Media Queries

Responsive Layouts

Achieved
Apr 4, 2020
Achievement
Responsive Theory

Responsive Layouts

Achieved
Apr 4, 2020
Achievement
Positioning Page Content

CSS Layout Basics

Achieved
Apr 4, 2020
Achievement
CSS Layout Project

CSS Layout Basics

Achieved
Apr 4, 2020
Achievement
Page Layout with the Float Property

CSS Layout Basics

Achieved
Apr 4, 2020
Achievement
Controlling Layout with CSS Display Modes

CSS Layout Basics

Achieved
Apr 4, 2020
Achievement
Getting Started with CSS Layout

CSS Layout Basics

Achieved
Apr 4, 2020
Achievement
Fundamental Concepts

CSS Basics (2014)

Achieved
Apr 2, 2020
Achievement
Designing with the Latest Features

CSS Basics (2014)

Achieved
Apr 2, 2020
Achievement
Basic Layout

CSS Basics (2014)

Achieved
Apr 2, 2020
Achievement
The Box Model

CSS Basics (2014)

Achieved
Apr 2, 2020
Achievement
Understanding Values and Units

CSS Basics (2014)

Achieved
Apr 2, 2020
Achievement
Basic Selectors

CSS Basics (2014)

Achieved
Apr 1, 2020
Achievement
Getting Started with CSS

CSS Basics (2014)

Achieved
Apr 1, 2020
Achievement
Going Further with HTML

HTML Basics

Achieved
Apr 1, 2020
Achievement
Images, Text and Links

HTML Basics

Achieved
Apr 1, 2020
Achievement
Structuring Your Content

HTML Basics

Achieved
Apr 1, 2020
Achievement
Getting Started With HTML

HTML Basics

Achieved
Apr 1, 2020
Achievement
Adding a New Web Page

Introduction to HTML and CSS (2016)

Achieved
Apr 1, 2020
Achievement
Make It Beautiful with CSS

Introduction to HTML and CSS (2016)

Achieved
Apr 1, 2020
Achievement
HTML: The Structural Foundation of Web Pages and Applications

Introduction to HTML and CSS (2016)

Achieved
Apr 1, 2020
Achievement
Getting Familiar with HTML and CSS

Introduction to HTML and CSS (2016)

Achieved
Apr 1, 2020
Achievement
Programming AJAX

AJAX Basics

Achieved
Apr 1, 2020
Achievement
AJAX Concepts

AJAX Basics

Achieved
Apr 1, 2020
Achievement
JavaScript Tools and Workflows

The Landscape of JavaScript

Achieved
Apr 1, 2020
Achievement
JavaScript is Everywhere

The Landscape of JavaScript

Achieved
Apr 1, 2020
Achievement
The Math Object

JavaScript Numbers

Achieved
Apr 1, 2020
Achievement
Working with Numbers

JavaScript Numbers

Achieved
Apr 1, 2020
Achievement
Making Decisions in Your Code with Conditional Statements

JavaScript Basics

Achieved
Apr 1, 2020
Achievement
Working With Strings

JavaScript Basics

Achieved
Mar 31, 2020
Achievement
Storing and Tracking Information with Variables

JavaScript Basics

Achieved
Mar 31, 2020
Achievement
Hello, JavaScript!

JavaScript Basics

Achieved
Mar 31, 2020
Achievement
Arrow Functions

JavaScript Functions

Achieved
Mar 31, 2020
Achievement
Pass Information Into Functions

JavaScript Functions

Achieved
Mar 31, 2020
Achievement
Create Reusable Code with Functions

JavaScript Functions

Achieved
Mar 31, 2020
Achievement
Traversing the DOM

JavaScript and the DOM (Retiring)

Achieved
Mar 30, 2020
Achievement
Responding to User Interaction

Interacting with the DOM

Achieved
Mar 28, 2020
Achievement
Making Changes to the DOM

JavaScript and the DOM (Retiring)

Achieved
Nov 20, 2019
Achievement
Getting a Handle on the DOM

JavaScript and the DOM (Retiring)

Achieved
Nov 18, 2019
Achievement
The Browser Environment

JavaScript and the DOM (Retiring)

Achieved
Nov 18, 2019
Achievement
JavaScript Objects

JavaScript Loops, Arrays and Objects

Achieved
Nov 18, 2019
Achievement
JavaScript Arrays

JavaScript Loops, Arrays and Objects

Achieved
Nov 1, 2019
Achievement
JavaScript Loops

JavaScript Loops, Arrays and Objects

Achieved
Oct 28, 2019
Achievement
JavaScript Functions

JavaScript Basics (Retired)

Achieved
Oct 2, 2019
Achievement
JavaScript Conditional Statements

JavaScript Basics (Retired)

Achieved
Oct 1, 2019
Achievement
JavaScript Numbers

JavaScript Basics (Retired)

Achieved
Sep 30, 2019
Achievement
JavaScript Variables

JavaScript Basics (Retired)

Achieved
Sep 30, 2019
Achievement
Introducing JavaScript

JavaScript Basics (Retired)

Achieved
Sep 30, 2019
Achievement
What is User Experience (UX)?

UX Basics

Achieved
Jan 14, 2018
Achievement
Understanding Classes

Object-Oriented PHP Basics

Achieved
Dec 14, 2017
Achievement
Why Object-Oriented Programming?

Object-Oriented PHP Basics

Achieved
Dec 3, 2017
Achievement
AJAX and APIs

AJAX Basics (retiring)

Achieved
Dec 2, 2017
Achievement
jQuery and AJAX

AJAX Basics (retiring)

Achieved
Nov 10, 2017
Achievement
Programming AJAX

AJAX Basics (retiring)

Achieved
Nov 10, 2017
Achievement
AJAX Concepts

AJAX Basics (retiring)

Achieved
Nov 9, 2017
Achievement
More Advanced PHP for WordPress

PHP for WordPress

Achieved
Jul 24, 2017
Achievement
Add Bootstrap Components to WordPress Theme

From Bootstrap to WordPress

Achieved
Jul 21, 2017
Achievement
Setup a Bootstrap Theme

From Bootstrap to WordPress

Achieved
Jul 21, 2017
Achievement
Hooking Into WordPress Plugins

WordPress Hooks - Actions and Filters

Achieved
Jul 20, 2017
Achievement
Action Functions in WordPress

WordPress Hooks - Actions and Filters

Achieved
Jul 20, 2017
Achievement
Filter Functions in WordPress

WordPress Hooks - Actions and Filters

Achieved
Jul 20, 2017
Achievement
An Overview of Hooks in WordPress

WordPress Hooks - Actions and Filters

Achieved
Jul 20, 2017
Achievement
Introduction to Ecommerce with WordPress

Ecommerce with WordPress and WooCommerce

Achieved
Jul 20, 2017
Achievement
SEO Plugins for WordPress

SEO for WordPress

Achieved
Jul 20, 2017
Achievement
Enhancing the SEO of a WordPress Theme

SEO for WordPress

Achieved
Jul 20, 2017
Achievement
Content Comes First

SEO for WordPress

Achieved
Jul 20, 2017
Achievement
Newbie

Achieved
Jul 20, 2017