Ondrej Korol

Ondrej Korol

Member Since February 2, 2016

9,056

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

    • Czech
    • English
    • French

115 Achievements

  • Achievement

    Taking a Selfie

    Build a Selfie App with Swift 2

    Achieved

    Oct 18, 2016

    Taking a Selfie
  • Achievement

    Asynchronous Error Handling

    Closures in Swift 2

    Achieved

    Oct 18, 2016

    Asynchronous Error Handling
  • Achievement

    Closures in Cocoa Touch

    Closures in Swift 2

    Achieved

    Oct 18, 2016

    Closures in Cocoa Touch
  • Achievement

    Building Standard Library Functions

    Closures in Swift 2

    Achieved

    Oct 18, 2016

    Building Standard Library Functions
  • Achievement

    Closure Expressions

    Closures in Swift 2

    Achieved

    Oct 17, 2016

    Closure Expressions
  • Achievement

    Deleting and Updating Data

    Introduction to Core Data with Swift 2

    Achieved

    Oct 12, 2016

    Deleting and Updating Data
  • Achievement

    Inserting and Saving Data Using a Context

    Introduction to Core Data with Swift 2

    Achieved

    Oct 12, 2016

    Inserting and Saving Data Using a Context
  • Achievement

    Fetching Data Using Fetch Requests

    Introduction to Core Data with Swift 2

    Achieved

    Oct 12, 2016

    Fetching Data Using Fetch Requests
  • Achievement

    Understanding the Core Data Stack

    Introduction to Core Data with Swift 2

    Achieved

    Oct 10, 2016

    Understanding the Core Data Stack
  • Achievement

    Building Forms with Bootstrap

    Bootstrap 4 Basics (Retired)

    Achieved

    Aug 16, 2016

    Building Forms with Bootstrap
  • Achievement

    Using Bootstrap Components

    Bootstrap 4 Basics (Retired)

    Achieved

    Aug 16, 2016

    Using Bootstrap Components
  • Achievement

    Responsive Layouts with the Bootstrap Grid

    Bootstrap 4 Basics (Retired)

    Achieved

    Aug 16, 2016

    Responsive Layouts with the Bootstrap Grid
  • Achievement

    Getting to Know Bootstrap 4

    Bootstrap 4 Basics (Retired)

    Achieved

    Aug 16, 2016

    Getting to Know Bootstrap 4
  • Achievement

    Responsive Patterns

    Responsive Layouts

    Achieved

    Aug 16, 2016

    Responsive Patterns
  • Achievement

    Media Queries

    Responsive Layouts

    Achieved

    Aug 16, 2016

    Media Queries
  • Achievement

    Responsive Theory

    Responsive Layouts

    Achieved

    Aug 16, 2016

    Responsive Theory
  • Achievement

    Positioning Page Content

    CSS Layout Basics

    Achieved

    Aug 15, 2016

    Positioning Page Content
  • Achievement

    CSS Layout Project

    CSS Layout Basics

    Achieved

    Aug 15, 2016

    CSS Layout Project
  • Achievement

    Page Layout with the Float Property

    CSS Layout Basics

    Achieved

    Aug 12, 2016

    Page Layout with the Float Property
  • Achievement

    Controlling Layout with CSS Display Modes

    CSS Layout Basics

    Achieved

    Aug 11, 2016

    Controlling Layout with CSS Display Modes
  • Achievement

    Getting Started with CSS Layout

    CSS Layout Basics

    Achieved

    Aug 11, 2016

    Getting Started with CSS Layout
  • Achievement

    JavaScript Functions

    JavaScript Basics (Retired)

    Achieved

    Aug 10, 2016

    JavaScript Functions
  • Achievement

    JavaScript Conditional Statements

    JavaScript Basics (Retired)

    Achieved

    Aug 10, 2016

    JavaScript Conditional Statements
  • Achievement

    JavaScript Numbers

    JavaScript Basics (Retired)

    Achieved

    Aug 10, 2016

    JavaScript Numbers
  • Achievement

    JavaScript Variables

    JavaScript Basics (Retired)

    Achieved

    Aug 9, 2016

    JavaScript Variables
  • Achievement

    Introducing JavaScript

    JavaScript Basics (Retired)

    Achieved

    Aug 9, 2016

    Introducing JavaScript
  • Achievement

    Fundamental Concepts

    CSS Basics (2014)

    Achieved

    Aug 9, 2016

    Fundamental Concepts
  • Achievement

    Designing with the Latest Features

    CSS Basics (2014)

    Achieved

    Aug 8, 2016

    Designing with the Latest Features
  • Achievement

    Basic Layout

    CSS Basics (2014)

    Achieved

    Aug 8, 2016

    Basic Layout
  • Achievement

    The Box Model

    CSS Basics (2014)

    Achieved

    Aug 8, 2016

    The Box Model
  • Achievement

    Understanding Values and Units

    CSS Basics (2014)

    Achieved

    Aug 8, 2016

    Understanding Values and Units
  • Achievement

    Basic Selectors

    CSS Basics (2014)

    Achieved

    Aug 8, 2016

    Basic Selectors
  • Achievement

    Getting Started with CSS

    CSS Basics (2014)

    Achieved

    Aug 7, 2016

    Getting Started with CSS
  • Achievement

    Choosing Options

    HTML Forms

    Achieved

    Aug 7, 2016

    Choosing Options
  • Achievement

    Organizing Forms

    HTML Forms

    Achieved

    Aug 7, 2016

    Organizing Forms
  • Achievement

    Form Basics

    HTML Forms

    Achieved

    Aug 7, 2016

    Form Basics
  • Achievement

    Debugging HTML and CSS Problems

    How to Make a Website

    Achieved

    Aug 7, 2016

    Debugging HTML and CSS Problems
  • Achievement

    Sharing a Website

    How to Make a Website

    Achieved

    Aug 7, 2016

    Sharing a Website
  • Achievement

    Responsive Web Design and Testing

    How to Make a Website

    Achieved

    Aug 7, 2016

    Responsive Web Design and Testing
  • Achievement

    Adding Pages to a Website

    How to Make a Website

    Achieved

    Aug 6, 2016

    Adding Pages to a Website
  • Achievement

    Styling Web Pages and Navigation

    How to Make a Website

    Achieved

    Aug 6, 2016

    Styling Web Pages and Navigation
  • Achievement

    Customizing Colors and Fonts

    How to Make a Website

    Achieved

    Aug 6, 2016

    Customizing Colors and Fonts
  • Achievement

    CSS: Cascading Style Sheets

    How to Make a Website

    Achieved

    Aug 6, 2016

    CSS: Cascading Style Sheets
  • Achievement

    Creating HTML Content

    How to Make a Website

    Achieved

    Aug 6, 2016

    Creating HTML Content
  • Achievement

    HTML First

    How to Make a Website

    Achieved

    Aug 6, 2016

    HTML First
  • Achievement

    Beginning HTML and CSS

    How to Make a Website

    Achieved

    Aug 5, 2016

    Beginning HTML and CSS
  • Achievement

    First Class Functions

    Closures in Swift 2

    Achieved

    Aug 5, 2016

    First Class Functions
  • Achievement

    URLs and Parameter Encoding

    Displaying Data with Table Views in Swift 2

    Achieved

    Jul 28, 2016

    URLs and Parameter Encoding
  • Achievement

    Introduction to UITableView

    Displaying Data with Table Views in Swift 2

    Achieved

    Jul 28, 2016

    Introduction to UITableView
  • Achievement

    Extensions and Protocols

    Intermediate Swift 2

    Achieved

    Jul 26, 2016

    Extensions and Protocols
  • Achievement

    Generics with Swift 2 - Beyond Basics

    Generics in Swift 2

    Achieved

    Jul 26, 2016

    Generics with Swift 2 - Beyond Basics
  • Achievement

    Generics with Swift 2

    Generics in Swift 2

    Achieved

    Jul 26, 2016

    Generics with Swift 2
  • Achievement

    Memory Management in Swift 2

    Intermediate Swift 2

    Achieved

    Jul 25, 2016

    Memory Management in Swift 2
  • Achievement

    Value Semantics, Type Methods and Inheritance

    Intermediate Swift 2

    Achieved

    Jul 25, 2016

    Value Semantics, Type Methods and Inheritance
  • Achievement

    Object Initialization in Swift 2

    Intermediate Swift 2

    Achieved

    Jul 25, 2016

    Object Initialization in Swift 2
  • Achievement

    Properties in Swift 2

    Intermediate Swift 2

    Achieved

    Jul 25, 2016

    Properties in Swift 2
  • Achievement

    Navigating Through an Adventure

    Build an Interactive Story App with Swift 2

    Achieved

    Apr 7, 2016

    Navigating Through an Adventure
  • Achievement

    Refreshing the Data

    Build a Weather App with Swift

    Achieved

    Apr 6, 2016

    Refreshing the Data
  • Achievement

    Adding Weather Icons

    Build a Weather App with Swift

    Achieved

    Apr 6, 2016

    Adding Weather Icons
  • Achievement

    Managing Complexity

    Build a Weather App with Swift

    Achieved

    Apr 5, 2016

    Managing Complexity
  • Achievement

    Interacting With Data From the Web

    Build a Weather App with Swift

    Achieved

    Mar 27, 2016

    Interacting With Data From the Web
  • Achievement

    Simple Data Structures

    Build a Weather App with Swift

    Achieved

    Mar 27, 2016

    Simple Data Structures
  • Achievement

    Refactoring Our Code (Swift)

    Build a Playlist Browser with Swift

    Achieved

    Mar 24, 2016

    Refactoring Our Code (Swift)
  • Achievement

    Building the Master and Detail Views (Swift)

    Build a Playlist Browser with Swift

    Achieved

    Mar 24, 2016

    Building the Master and Detail Views (Swift)
  • Achievement

    Building a Music Library and Playlists (Swift)

    Build a Playlist Browser with Swift

    Achieved

    Mar 24, 2016

    Building a Music Library and Playlists (Swift)
  • Achievement

    Using a Navigation Controller With Segues (Swift)

    Build a Playlist Browser with Swift

    Achieved

    Mar 23, 2016

    Using a Navigation Controller With Segues (Swift)
  • Achievement

    Working With Multiple View Controllers (Swift)

    Build a Playlist Browser with Swift

    Achieved

    Mar 23, 2016

    Working With Multiple View Controllers (Swift)
  • Achievement

    Displaying Additional Views

    Build a Vending Machine App in Swift 2.0

    Achieved

    Mar 19, 2016

    Displaying Additional Views
  • Achievement

    Using the Vending Machine

    Build a Vending Machine App in Swift 2.0

    Achieved

    Mar 18, 2016

    Using the Vending Machine
  • Achievement

    Loading Data From a Resource

    Build a Vending Machine App in Swift 2.0

    Achieved

    Mar 18, 2016

    Loading Data From a Resource
  • Achievement

    Modeling An Interface

    Build a Vending Machine App in Swift 2.0

    Achieved

    Mar 10, 2016

    Modeling An Interface
  • Achievement

    Error Handling in Swift 2.0

    Error Handling in Swift 2.0

    Achieved

    Mar 6, 2016

    Error Handling in Swift 2.0
  • Achievement

    Creating Flexible Objects Using Protocols

    Swift 2.0 Protocols

    Achieved

    Mar 5, 2016

    Creating Flexible Objects Using Protocols
  • Achievement

    Swift 2.0 Protocols

    Swift 2.0 Protocols

    Achieved

    Mar 3, 2016

    Swift 2.0 Protocols
  • Achievement

    Objects and Optionals

    Swift 2.0 Enumerations and Optionals

    Achieved

    Mar 3, 2016

    Objects and Optionals
  • Achievement

    Introduction to Optionals

    Swift 2.0 Enumerations and Optionals

    Achieved

    Mar 3, 2016

    Introduction to Optionals
  • Achievement

    Introduction to Enumerations

    Swift 2.0 Enumerations and Optionals

    Achieved

    Mar 2, 2016

    Introduction to Enumerations
  • Achievement

    Differentiating Between Objects

    Object-Oriented Swift 2.0

    Achieved

    Mar 1, 2016

    Differentiating Between Objects
  • Achievement

    Class Inheritance

    Object-Oriented Swift 2.0

    Achieved

    Mar 1, 2016

    Class Inheritance
  • Achievement

    Classes

    Object-Oriented Swift 2.0

    Achieved

    Mar 1, 2016

    Classes
  • Achievement

    Running Apps on a Device

    Build a Simple iPhone App with Swift 2.0

    Achieved

    Feb 29, 2016

    Running Apps on a Device
  • Achievement

    Improving Our User Interface

    Build a Simple iPhone App with Swift 2.0

    Achieved

    Feb 29, 2016

    Improving Our User Interface
  • Achievement

    Structs as Data Models

    Build a Simple iPhone App with Swift 2.0

    Achieved

    Feb 29, 2016

    Structs as Data Models
  • Achievement

    View Controllers and Views

    Build a Simple iPhone App with Swift 2.0

    Achieved

    Feb 28, 2016

    View Controllers and Views
  • Achievement

    Getting Started with iOS Development

    Build a Simple iPhone App with Swift 2.0

    Achieved

    Feb 27, 2016

    Getting Started with iOS Development
  • Achievement

    Complex Data Structures

    Object-Oriented Swift 2.0

    Achieved

    Feb 27, 2016

    Complex Data Structures
  • Achievement

    Function Parameters

    Swift 2.0 Functions

    Achieved

    Feb 22, 2016

    Function Parameters
  • Achievement

    Functions in Swift 2.0

    Swift 2.0 Functions

    Achieved

    Feb 21, 2016

    Functions in Swift 2.0
  • Achievement

    Control Flow with Conditional Statements

    Swift 2.0 Collections and Control Flow

    Achieved

    Feb 21, 2016

    Control Flow with Conditional Statements
  • Achievement

    Control Flow With Loops

    Swift 2.0 Collections and Control Flow

    Achieved

    Feb 17, 2016

    Control Flow With Loops
  • Achievement

    Swift Dictionaries

    Swift 2.0 Collections and Control Flow

    Achieved

    Feb 17, 2016

    Swift Dictionaries
  • Achievement

    Introduction to Collections

    Swift 2.0 Collections and Control Flow

    Achieved

    Feb 17, 2016

    Introduction to Collections
  • Achievement

    Swift Operators

    Swift 2.0 Basics

    Achieved

    Feb 16, 2016

    Swift Operators
  • Achievement

    Swift Types

    Swift 2.0 Basics

    Achieved

    Feb 15, 2016

    Swift Types
  • Achievement

    An Introduction to Swift Programming

    Swift 2.0 Basics

    Achieved

    Feb 15, 2016

    An Introduction to Swift Programming
  • Achievement

    Ruby Blocks

    Ruby Blocks

    Achieved

    Feb 14, 2016

    Ruby Blocks
  • Achievement

    Build a Simple Todo List Program

    Ruby Booleans

    Achieved

    Feb 8, 2016

    Build a Simple Todo List Program
  • Achievement

    Ruby Booleans

    Ruby Booleans

    Achieved

    Feb 6, 2016

    Ruby Booleans
  • Achievement

    Build a Bank Account Class

    Ruby Objects and Classes

    Achieved

    Feb 6, 2016

    Build a Bank Account Class
  • Achievement

    Ruby Variables and Methods

    Ruby Objects and Classes

    Achieved

    Feb 5, 2016

    Ruby Variables and Methods
  • Achievement

    Ruby Objects and Classes

    Ruby Objects and Classes

    Achieved

    Feb 5, 2016

    Ruby Objects and Classes
  • Achievement

    Build a Simple Contact List

    Ruby Loops

    Achieved

    Feb 4, 2016

    Build a Simple Contact List
  • Achievement

    Ruby Iteration

    Ruby Loops

    Achieved

    Feb 3, 2016

    Ruby Iteration
  • Achievement

    Ruby Loops

    Ruby Loops

    Achieved

    Feb 3, 2016

    Ruby Loops
  • Achievement

    Build a Grocery List Program

    Ruby Collections

    Achieved

    Feb 2, 2016

    Build a Grocery List Program
  • Achievement

    Ruby Hashes

    Ruby Collections

    Achieved

    Feb 2, 2016

    Ruby Hashes
  • Achievement

    Ruby Arrays

    Ruby Collections

    Achieved

    Feb 2, 2016

    Ruby Arrays
  • Achievement

    Ruby Logical Operators

    Ruby Operators and Control Structures

    Achieved

    Feb 2, 2016

    Ruby Logical Operators
  • Achievement

    Ruby Control Structures

    Ruby Operators and Control Structures

    Achieved

    Feb 2, 2016

    Ruby Control Structures
  • Achievement

    Ruby Operators

    Ruby Operators and Control Structures

    Achieved

    Feb 2, 2016

    Ruby Operators
  • Achievement

    Ruby Methods

    Ruby Basics (Retired)

    Achieved

    Feb 2, 2016

    Ruby Methods
  • Achievement

    Ruby Numbers (Ruby Basics)

    Ruby Basics (Retired)

    Achieved

    Feb 2, 2016

    Ruby Numbers (Ruby Basics)
  • Achievement

    Ruby Strings (Ruby Basics)

    Ruby Basics (Retired)

    Achieved

    Feb 2, 2016

    Ruby Strings (Ruby Basics)
  • Achievement

    How Ruby Works

    Ruby Basics (Retired)

    Achieved

    Feb 2, 2016

    How Ruby Works
  • Achievement

    Newbie

    Achieved

    Feb 2, 2016

    Newbie