Join our Live Session: The Ultimate Interview Masterclass! ⭐ Register here!

🤑 Join the Treehouse affiliate program and earn 25% commission!

✨ No-code curious? Check out 4 new FREE Adalo courses and start building an app in minutes — no code required!

🌟 Dreaming of a bright future? 🎓 Ask about the Treehouse Scholarship program! 🚀

David Papandrew

San Francisco

Have developed several iOS and Android apps for medical professionals including: Oral Contraceptives Reference, VBAC Calculator, Estimated Fetal Weight Calculator, Bishop Score Calculator and APGAR Score.

8,386

Total Points

•
1,002

Python

990 pts
Achievements

12 pts
Forum
•
338

Development Tools

338 pts
Achievements

0 pts
Forum
•
7

Java

7 pts
Achievements

0 pts
Forum
•
2

Professional Skills

2 pts
Achievements

0 pts
Forum
•
1

Go Language

1 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.

93 Achievements

Achievement
C# Syntax

C# Basics

Achieved
Apr 30, 2020
Achievement
Python Tuples

Python Collections (2016, retired 2019)

Achieved
Mar 9, 2017
Achievement
Generic Types

Generics in Swift

Achieved
Feb 17, 2017
Achievement
Generic Functions, Parameters and Constraints

Generics in Swift

Achieved
Feb 17, 2017
Achievement
Writing Great Swift

API Design Guidelines in Swift

Achieved
Feb 14, 2017
Achievement
Using the Delegate Pattern in iOS

Delegation in iOS

Achieved
Feb 13, 2017
Achievement
The Delegate Pattern

Delegation in iOS

Achieved
Feb 13, 2017
Achievement
Python Dictionaries

Python Collections (2016, retired 2019)

Achieved
Feb 10, 2017
Achievement
Python Slices

Python Collections (2016, retired 2019)

Achieved
Feb 9, 2017
Achievement
Python Lists

Python Collections (2016, retired 2019)

Achieved
Feb 9, 2017
Achievement
Access Control

Intermediate Swift

Achieved
Feb 7, 2017
Achievement
Memory Management in Swift

Intermediate Swift

Achieved
Feb 7, 2017
Achievement
Extensions and Protocols

Intermediate Swift

Achieved
Feb 7, 2017
Achievement
Value Semantics, Type Methods and Inheritance

Intermediate Swift

Achieved
Feb 7, 2017
Achievement
Object Initialization

Intermediate Swift

Achieved
Feb 6, 2017
Achievement
Letter Game App

Python Basics (2015)

Achieved
Feb 4, 2017
Achievement
Properties

Intermediate Swift

Achieved
Feb 4, 2017
Achievement
Creating Flexible Objects Using Protocols

Protocols in Swift

Achieved
Feb 2, 2017
Achievement
Protocol Basics

Protocols in Swift

Achieved
Feb 2, 2017
Achievement
Objects and Optionals

Enumerations and Optionals in Swift

Achieved
Jan 31, 2017
Achievement
Introduction to Optionals

Enumerations and Optionals in Swift

Achieved
Jan 26, 2017
Achievement
Introduction to Enumerations

Enumerations and Optionals in Swift

Achieved
Jan 25, 2017
Achievement
Differentiating Between Objects

Object-Oriented Swift

Achieved
Jan 25, 2017
Achievement
Class Inheritance

Object-Oriented Swift

Achieved
Jan 25, 2017
Achievement
Classes in Swift

Object-Oriented Swift

Achieved
Jan 25, 2017
Achievement
Complex Data Structures

Object-Oriented Swift

Achieved
Jan 25, 2017
Achievement
Adding Power to Functions

Functions in Swift

Achieved
Jan 24, 2017
Achievement
Functions in Swift

Functions in Swift

Achieved
Jan 24, 2017
Achievement
Control Flow With Conditional Statements

Swift Collections and Control Flow

Achieved
Jan 23, 2017
Achievement
Control Flow With Loops

Swift Collections and Control Flow

Achieved
Jan 20, 2017
Achievement
Dictionaries in Swift

Swift Collections and Control Flow

Achieved
Jan 20, 2017
Achievement
Introduction to Collections

Swift Collections and Control Flow

Achieved
Jan 18, 2017
Achievement
Swift Operators

Swift Basics

Achieved
Jan 18, 2017
Achievement
Swift Types

Swift Basics

Achieved
Jan 18, 2017
Achievement
An Introduction to Swift Programming

Swift Basics

Achieved
Jan 18, 2017
Achievement
Error Handling

Error Handling in Swift

Achieved
Jan 17, 2017
Achievement
Trait Collections

Introduction to Auto Layout in iOS

Achieved
Dec 7, 2016
Achievement
Understanding Scroll Views

Introduction to Scroll Views with Swift 2

Achieved
Oct 2, 2016
Achievement
Number Game App

Python Basics (2015)

Achieved
Oct 1, 2016
Achievement
What Are Design Patterns?

iOS Design Patterns

Achieved
Sep 30, 2016
Achievement
Protocol Oriented Networking

Network Programming with Swift 2

Achieved
Sep 30, 2016
Achievement
Installing Programs

Console Foundations

Achieved
Sep 30, 2016
Achievement
Environment and Redirection

Console Foundations

Achieved
Sep 30, 2016
Achievement
Console Processes

Console Foundations

Achieved
Sep 30, 2016
Achievement
Console Users and Permission

Console Foundations

Achieved
Sep 29, 2016
Achievement
Moving Around in the Console

Console Foundations

Achieved
Sep 29, 2016
Achievement
Shopping List App

Python Basics (2015)

Achieved
Sep 28, 2016
Achievement
Memory Management in Swift 2

Intermediate Swift 2

Achieved
Sep 28, 2016
Achievement
Extensions and Protocols

Intermediate Swift 2

Achieved
Sep 28, 2016
Achievement
Logic in Python

Python Basics (2015)

Achieved
Sep 27, 2016
Achievement
Python Data Types

Python Basics (2015)

Achieved
Sep 27, 2016
Achievement
Value Semantics, Type Methods and Inheritance

Intermediate Swift 2

Achieved
Sep 25, 2016
Achievement
Python For Beginners

Python Basics (2015)

Achieved
Sep 22, 2016
Achievement
Fetching Data From the Web

Network Programming with Swift 2

Achieved
Sep 12, 2016
Achievement
Modeling Forecast Data

Network Programming with Swift 2

Achieved
Sep 9, 2016
Achievement
Asynchronous Error Handling

Closures in Swift 2

Achieved
Sep 9, 2016
Achievement
Closures in Cocoa Touch

Closures in Swift 2

Achieved
Sep 9, 2016
Achievement
Building Standard Library Functions

Closures in Swift 2

Achieved
Sep 9, 2016
Achievement
Closure Expressions

Closures in Swift 2

Achieved
Sep 7, 2016
Achievement
First Class Functions

Closures in Swift 2

Achieved
Sep 7, 2016
Achievement
Creating a Story

Build an Interactive Story App with Swift 2

Achieved
Sep 1, 2016
Achievement
Navigating Through an Adventure

Build an Interactive Story App with Swift 2

Achieved
Sep 1, 2016
Achievement
Using the Vending Machine

Build a Vending Machine App in Swift 2.0

Achieved
Aug 31, 2016
Achievement
Loading Data From a Resource

Build a Vending Machine App in Swift 2.0

Achieved
Aug 24, 2016
Achievement
Modeling An Interface

Build a Vending Machine App in Swift 2.0

Achieved
Aug 24, 2016
Achievement
Delegation in iOS

Delegates in Swift 2

Achieved
Aug 2, 2016
Achievement
Introduction to Delegates

Delegates in Swift 2

Achieved
Aug 1, 2016
Achievement
Object Initialization in Swift 2

Intermediate Swift 2

Achieved
Aug 1, 2016
Achievement
Properties in Swift 2

Intermediate Swift 2

Achieved
Jul 30, 2016
Achievement
Creating Flexible Objects Using Protocols

Swift 2.0 Protocols

Achieved
Jul 29, 2016
Achievement
Swift 2.0 Protocols

Swift 2.0 Protocols

Achieved
Jul 28, 2016
Achievement
Objects and Optionals

Swift 2.0 Enumerations and Optionals

Achieved
Jul 27, 2016
Achievement
Introduction to Optionals

Swift 2.0 Enumerations and Optionals

Achieved
Jul 27, 2016
Achievement
Introduction to Enumerations

Swift 2.0 Enumerations and Optionals

Achieved
Jul 26, 2016
Achievement
Running Apps on a Device

Build a Simple iPhone App with Swift 2.0

Achieved
Jul 25, 2016
Achievement
Improving Our User Interface

Build a Simple iPhone App with Swift 2.0

Achieved
Jul 25, 2016
Achievement
Structs as Data Models

Build a Simple iPhone App with Swift 2.0

Achieved
Jul 25, 2016
Achievement
View Controllers and Views

Build a Simple iPhone App with Swift 2.0

Achieved
Jul 25, 2016
Achievement
Getting Started with iOS Development

Build a Simple iPhone App with Swift 2.0

Achieved
Jul 23, 2016
Achievement
Differentiating Between Objects

Object-Oriented Swift 2.0

Achieved
Jul 22, 2016
Achievement
Class Inheritance

Object-Oriented Swift 2.0

Achieved
Jul 22, 2016
Achievement
Classes

Object-Oriented Swift 2.0

Achieved
Jul 21, 2016
Achievement
Complex Data Structures

Object-Oriented Swift 2.0

Achieved
Jul 21, 2016
Achievement
Function Parameters

Swift 2.0 Functions

Achieved
Jul 21, 2016
Achievement
Swift Operators

Swift 2.0 Basics

Achieved
Jul 21, 2016
Achievement
Functions in Swift 2.0

Swift 2.0 Functions

Achieved
Jul 21, 2016
Achievement
Swift Types

Swift 2.0 Basics

Achieved
Jul 21, 2016
Achievement
An Introduction to Swift Programming

Swift 2.0 Basics

Achieved
Jul 21, 2016
Achievement
Control Flow with Conditional Statements

Swift 2.0 Collections and Control Flow

Achieved
Jul 20, 2016
Achievement
Control Flow With Loops

Swift 2.0 Collections and Control Flow

Achieved
Jul 20, 2016
Achievement
Swift Dictionaries

Swift 2.0 Collections and Control Flow

Achieved
Jul 20, 2016
Achievement
Introduction to Collections

Swift 2.0 Collections and Control Flow

Achieved
Jul 20, 2016
Achievement
Newbie

Achieved
Jul 18, 2016