David Papandrew

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

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

    C# Syntax
  • Achievement

    Python Tuples

    Python Collections (2016, retired 2019)

    Achieved

    Mar 9, 2017

    Python Tuples
  • Achievement

    Generic Types

    Generics in Swift

    Achieved

    Feb 17, 2017

    Generic Types
  • Achievement

    Generic Functions, Parameters and Constraints

    Generics in Swift

    Achieved

    Feb 17, 2017

    Generic Functions, Parameters and Constraints
  • Achievement

    Writing Great Swift

    API Design Guidelines in Swift

    Achieved

    Feb 14, 2017

    Writing Great Swift
  • Achievement

    Using the Delegate Pattern in iOS

    Delegation in iOS

    Achieved

    Feb 13, 2017

    Using the Delegate Pattern in iOS
  • Achievement

    The Delegate Pattern

    Delegation in iOS

    Achieved

    Feb 13, 2017

    The Delegate Pattern
  • Achievement

    Python Dictionaries

    Python Collections (2016, retired 2019)

    Achieved

    Feb 10, 2017

    Python Dictionaries
  • Achievement

    Python Slices

    Python Collections (2016, retired 2019)

    Achieved

    Feb 9, 2017

    Python Slices
  • Achievement

    Python Lists

    Python Collections (2016, retired 2019)

    Achieved

    Feb 9, 2017

    Python Lists
  • Achievement

    Access Control

    Intermediate Swift

    Achieved

    Feb 7, 2017

    Access Control
  • Achievement

    Memory Management in Swift

    Intermediate Swift

    Achieved

    Feb 7, 2017

    Memory Management in Swift
  • Achievement

    Extensions and Protocols

    Intermediate Swift

    Achieved

    Feb 7, 2017

    Extensions and Protocols
  • Achievement

    Value Semantics, Type Methods and Inheritance

    Intermediate Swift

    Achieved

    Feb 7, 2017

    Value Semantics, Type Methods and Inheritance
  • Achievement

    Object Initialization

    Intermediate Swift

    Achieved

    Feb 6, 2017

    Object Initialization
  • Achievement

    Letter Game App

    Python Basics (2015)

    Achieved

    Feb 4, 2017

    Letter Game App
  • Achievement

    Properties

    Intermediate Swift

    Achieved

    Feb 4, 2017

    Properties
  • Achievement

    Creating Flexible Objects Using Protocols

    Protocols in Swift

    Achieved

    Feb 2, 2017

    Creating Flexible Objects Using Protocols
  • Achievement

    Protocol Basics

    Protocols in Swift

    Achieved

    Feb 2, 2017

    Protocol Basics
  • Achievement

    Objects and Optionals

    Enumerations and Optionals in Swift

    Achieved

    Jan 31, 2017

    Objects and Optionals
  • Achievement

    Introduction to Optionals

    Enumerations and Optionals in Swift

    Achieved

    Jan 26, 2017

    Introduction to Optionals
  • Achievement

    Introduction to Enumerations

    Enumerations and Optionals in Swift

    Achieved

    Jan 25, 2017

    Introduction to Enumerations
  • Achievement

    Differentiating Between Objects

    Object-Oriented Swift

    Achieved

    Jan 25, 2017

    Differentiating Between Objects
  • Achievement

    Class Inheritance

    Object-Oriented Swift

    Achieved

    Jan 25, 2017

    Class Inheritance
  • Achievement

    Classes in Swift

    Object-Oriented Swift

    Achieved

    Jan 25, 2017

    Classes in Swift
  • Achievement

    Complex Data Structures

    Object-Oriented Swift

    Achieved

    Jan 25, 2017

    Complex Data Structures
  • Achievement

    Adding Power to Functions

    Functions in Swift

    Achieved

    Jan 24, 2017

    Adding Power to Functions
  • Achievement

    Functions in Swift

    Functions in Swift

    Achieved

    Jan 24, 2017

    Functions in Swift
  • Achievement

    Control Flow With Conditional Statements

    Swift Collections and Control Flow

    Achieved

    Jan 23, 2017

    Control Flow With Conditional Statements
  • Achievement

    Control Flow With Loops

    Swift Collections and Control Flow

    Achieved

    Jan 20, 2017

    Control Flow With Loops
  • Achievement

    Dictionaries in Swift

    Swift Collections and Control Flow

    Achieved

    Jan 20, 2017

    Dictionaries in Swift
  • Achievement

    Introduction to Collections

    Swift Collections and Control Flow

    Achieved

    Jan 18, 2017

    Introduction to Collections
  • Achievement

    Swift Operators

    Swift Basics

    Achieved

    Jan 18, 2017

    Swift Operators
  • Achievement

    Swift Types

    Swift Basics

    Achieved

    Jan 18, 2017

    Swift Types
  • Achievement

    An Introduction to Swift Programming

    Swift Basics

    Achieved

    Jan 18, 2017

    An Introduction to Swift Programming
  • Achievement

    Error Handling

    Error Handling in Swift

    Achieved

    Jan 17, 2017

    Error Handling
  • Achievement

    Trait Collections

    Introduction to Auto Layout in iOS

    Achieved

    Dec 7, 2016

    Trait Collections
  • Achievement

    Understanding Scroll Views

    Introduction to Scroll Views with Swift 2

    Achieved

    Oct 2, 2016

    Understanding Scroll Views
  • Achievement

    Number Game App

    Python Basics (2015)

    Achieved

    Oct 1, 2016

    Number Game App
  • Achievement

    What Are Design Patterns?

    iOS Design Patterns

    Achieved

    Sep 30, 2016

    What Are Design Patterns?
  • Achievement

    Protocol Oriented Networking

    Network Programming with Swift 2

    Achieved

    Sep 30, 2016

    Protocol Oriented Networking
  • Achievement

    Installing Programs

    Console Foundations

    Achieved

    Sep 30, 2016

    Installing Programs
  • Achievement

    Environment and Redirection

    Console Foundations

    Achieved

    Sep 30, 2016

    Environment and Redirection
  • Achievement

    Console Processes

    Console Foundations

    Achieved

    Sep 30, 2016

    Console Processes
  • Achievement

    Console Users and Permission

    Console Foundations

    Achieved

    Sep 29, 2016

    Console Users and Permission
  • Achievement

    Moving Around in the Console

    Console Foundations

    Achieved

    Sep 29, 2016

    Moving Around in the Console
  • Achievement

    Shopping List App

    Python Basics (2015)

    Achieved

    Sep 28, 2016

    Shopping List App
  • Achievement

    Memory Management in Swift 2

    Intermediate Swift 2

    Achieved

    Sep 28, 2016

    Memory Management in Swift 2
  • Achievement

    Extensions and Protocols

    Intermediate Swift 2

    Achieved

    Sep 28, 2016

    Extensions and Protocols
  • Achievement

    Logic in Python

    Python Basics (2015)

    Achieved

    Sep 27, 2016

    Logic in Python
  • Achievement

    Python Data Types

    Python Basics (2015)

    Achieved

    Sep 27, 2016

    Python Data Types
  • Achievement

    Value Semantics, Type Methods and Inheritance

    Intermediate Swift 2

    Achieved

    Sep 25, 2016

    Value Semantics, Type Methods and Inheritance
  • Achievement

    Python For Beginners

    Python Basics (2015)

    Achieved

    Sep 22, 2016

    Python For Beginners
  • Achievement

    Fetching Data From the Web

    Network Programming with Swift 2

    Achieved

    Sep 12, 2016

    Fetching Data From the Web
  • Achievement

    Modeling Forecast Data

    Network Programming with Swift 2

    Achieved

    Sep 9, 2016

    Modeling Forecast Data
  • Achievement

    Asynchronous Error Handling

    Closures in Swift 2

    Achieved

    Sep 9, 2016

    Asynchronous Error Handling
  • Achievement

    Closures in Cocoa Touch

    Closures in Swift 2

    Achieved

    Sep 9, 2016

    Closures in Cocoa Touch
  • Achievement

    Building Standard Library Functions

    Closures in Swift 2

    Achieved

    Sep 9, 2016

    Building Standard Library Functions
  • Achievement

    Closure Expressions

    Closures in Swift 2

    Achieved

    Sep 7, 2016

    Closure Expressions
  • Achievement

    First Class Functions

    Closures in Swift 2

    Achieved

    Sep 7, 2016

    First Class Functions
  • Achievement

    Creating a Story

    Build an Interactive Story App with Swift 2

    Achieved

    Sep 1, 2016

    Creating a Story
  • Achievement

    Navigating Through an Adventure

    Build an Interactive Story App with Swift 2

    Achieved

    Sep 1, 2016

    Navigating Through an Adventure
  • Achievement

    Using the Vending Machine

    Build a Vending Machine App in Swift 2.0

    Achieved

    Aug 31, 2016

    Using the Vending Machine
  • Achievement

    Loading Data From a Resource

    Build a Vending Machine App in Swift 2.0

    Achieved

    Aug 24, 2016

    Loading Data From a Resource
  • Achievement

    Modeling An Interface

    Build a Vending Machine App in Swift 2.0

    Achieved

    Aug 24, 2016

    Modeling An Interface
  • Achievement

    Delegation in iOS

    Delegates in Swift 2

    Achieved

    Aug 2, 2016

    Delegation in iOS
  • Achievement

    Introduction to Delegates

    Delegates in Swift 2

    Achieved

    Aug 1, 2016

    Introduction to Delegates
  • Achievement

    Object Initialization in Swift 2

    Intermediate Swift 2

    Achieved

    Aug 1, 2016

    Object Initialization in Swift 2
  • Achievement

    Properties in Swift 2

    Intermediate Swift 2

    Achieved

    Jul 30, 2016

    Properties in Swift 2
  • Achievement

    Creating Flexible Objects Using Protocols

    Swift 2.0 Protocols

    Achieved

    Jul 29, 2016

    Creating Flexible Objects Using Protocols
  • Achievement

    Swift 2.0 Protocols

    Swift 2.0 Protocols

    Achieved

    Jul 28, 2016

    Swift 2.0 Protocols
  • Achievement

    Objects and Optionals

    Swift 2.0 Enumerations and Optionals

    Achieved

    Jul 27, 2016

    Objects and Optionals
  • Achievement

    Introduction to Optionals

    Swift 2.0 Enumerations and Optionals

    Achieved

    Jul 27, 2016

    Introduction to Optionals
  • Achievement

    Introduction to Enumerations

    Swift 2.0 Enumerations and Optionals

    Achieved

    Jul 26, 2016

    Introduction to Enumerations
  • Achievement

    Running Apps on a Device

    Build a Simple iPhone App with Swift 2.0

    Achieved

    Jul 25, 2016

    Running Apps on a Device
  • Achievement

    Improving Our User Interface

    Build a Simple iPhone App with Swift 2.0

    Achieved

    Jul 25, 2016

    Improving Our User Interface
  • Achievement

    Structs as Data Models

    Build a Simple iPhone App with Swift 2.0

    Achieved

    Jul 25, 2016

    Structs as Data Models
  • Achievement

    View Controllers and Views

    Build a Simple iPhone App with Swift 2.0

    Achieved

    Jul 25, 2016

    View Controllers and Views
  • Achievement

    Getting Started with iOS Development

    Build a Simple iPhone App with Swift 2.0

    Achieved

    Jul 23, 2016

    Getting Started with iOS Development
  • Achievement

    Differentiating Between Objects

    Object-Oriented Swift 2.0

    Achieved

    Jul 22, 2016

    Differentiating Between Objects
  • Achievement

    Class Inheritance

    Object-Oriented Swift 2.0

    Achieved

    Jul 22, 2016

    Class Inheritance
  • Achievement

    Classes

    Object-Oriented Swift 2.0

    Achieved

    Jul 21, 2016

    Classes
  • Achievement

    Complex Data Structures

    Object-Oriented Swift 2.0

    Achieved

    Jul 21, 2016

    Complex Data Structures
  • Achievement

    Function Parameters

    Swift 2.0 Functions

    Achieved

    Jul 21, 2016

    Function Parameters
  • Achievement

    Swift Operators

    Swift 2.0 Basics

    Achieved

    Jul 21, 2016

    Swift Operators
  • Achievement

    Functions in Swift 2.0

    Swift 2.0 Functions

    Achieved

    Jul 21, 2016

    Functions in Swift 2.0
  • Achievement

    Swift Types

    Swift 2.0 Basics

    Achieved

    Jul 21, 2016

    Swift Types
  • Achievement

    An Introduction to Swift Programming

    Swift 2.0 Basics

    Achieved

    Jul 21, 2016

    An Introduction to Swift Programming
  • Achievement

    Control Flow with Conditional Statements

    Swift 2.0 Collections and Control Flow

    Achieved

    Jul 20, 2016

    Control Flow with Conditional Statements
  • Achievement

    Control Flow With Loops

    Swift 2.0 Collections and Control Flow

    Achieved

    Jul 20, 2016

    Control Flow With Loops
  • Achievement

    Swift Dictionaries

    Swift 2.0 Collections and Control Flow

    Achieved

    Jul 20, 2016

    Swift Dictionaries
  • Achievement

    Introduction to Collections

    Swift 2.0 Collections and Control Flow

    Achieved

    Jul 20, 2016

    Introduction to Collections
  • Achievement

    Newbie

    Achieved

    Jul 18, 2016

    Newbie