Andrey Zelentsov

Andrey Zelentsov

Kherson, Ukraine
Open to Work

12,764

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

    • English
    • Ukrainian
    • Russian

157 Achievements

  • Achievement

    Introducing 'Four in a Row'

    Object-Oriented JavaScript: Challenge

    Achieved

    Oct 24, 2019

    Introducing 'Four in a Row'
  • Achievement

    HTTP Methods and Headers

    Build a Simple Dynamic Site with Node.js

    Achieved

    Oct 17, 2019

    HTTP Methods and Headers
  • Achievement

    Creating a Basic Template Engine in Node.js

    Build a Simple Dynamic Site with Node.js

    Achieved

    Oct 17, 2019

    Creating a Basic Template Engine in Node.js
  • Achievement

    Creating a Command Line Weather Application

    Node.js Basics 2017

    Achieved

    Oct 16, 2019

    Creating a Command Line Weather Application
  • Achievement

    Handling Errors in Node

    Node.js Basics 2017

    Achieved

    Oct 16, 2019

    Handling Errors in Node
  • Achievement

    Getting Data From an API With Node

    Node.js Basics 2017

    Achieved

    Oct 16, 2019

    Getting Data From an API With Node
  • Achievement

    Understanding jQuery Events and DOM Traversal (2017)

    jQuery Basics

    Achieved

    Oct 16, 2019

    Understanding jQuery Events and DOM Traversal (2017)
  • Achievement

    Exploring Async/Await

    Asynchronous Programming with JavaScript

    Achieved

    Oct 15, 2019

    Exploring Async/Await
  • Achievement

    Understanding Promises

    Asynchronous Programming with JavaScript

    Achieved

    Oct 15, 2019

    Understanding Promises
  • Achievement

    Asynchronous JavaScript with Callbacks

    Asynchronous Programming with JavaScript

    Achieved

    Oct 15, 2019

    Asynchronous JavaScript with Callbacks
  • Achievement

    What is Asynchronous Programming?

    Asynchronous Programming with JavaScript

    Achieved

    Oct 15, 2019

    What is Asynchronous Programming?
  • Achievement

    Introducing jQuery (2017)

    jQuery Basics

    Achieved

    Oct 14, 2019

    Introducing jQuery (2017)
  • Achievement

    Create Function Using Arrow Syntax

    Getting Started With ES2015

    Achieved

    Oct 14, 2019

    Create Function Using Arrow Syntax
  • Achievement

    Using Template Literals

    Getting Started With ES2015

    Achieved

    Oct 14, 2019

    Using Template Literals
  • Achievement

    Defining Variables With let and const

    Getting Started With ES2015

    Achieved

    Oct 14, 2019

    Defining Variables With let and const
  • Achievement

    JavaScript is Everywhere

    The Landscape of JavaScript

    Achieved

    Oct 14, 2019

    JavaScript is Everywhere
  • Achievement

    JavaScript Tools and Workflows

    The Landscape of JavaScript

    Achieved

    Oct 14, 2019

    JavaScript Tools and Workflows
  • Achievement

    Introducing JavaScript

    Introducing JavaScript

    Achieved

    Oct 14, 2019

    Introducing JavaScript
  • Achievement

    Finishing the Game

    Introducing JavaScript

    Achieved

    Oct 14, 2019

    Finishing the Game
  • Achievement

    Why React Native

    Introduction to React Native

    Achieved

    Jun 14, 2018

    Why React Native
  • Achievement

    Getters and Setters

    Object-Oriented JavaScript

    Achieved

    Jun 6, 2018

    Getters and Setters
  • Achievement

    Working with Classes in JavaScript

    Object-Oriented JavaScript

    Achieved

    Jun 6, 2018

    Working with Classes in JavaScript
  • Achievement

    Object Basics

    Object-Oriented JavaScript

    Achieved

    Jun 5, 2018

    Object Basics
  • Achievement

    Introduction to Object-Oriented JavaScript

    Object-Oriented JavaScript

    Achieved

    Jun 5, 2018

    Introduction to Object-Oriented JavaScript
  • Achievement

    Setting up with Create React App

    React by Example

    Achieved

    Jun 5, 2018

    Setting up with Create React App
  • Achievement

    Going Further with Routing

    React Router 4 Basics

    Achieved

    May 27, 2018

    Going Further with Routing
  • Achievement

    Navigating, Nesting and Redirecting Routes

    React Router 4 Basics

    Achieved

    May 13, 2018

    Navigating, Nesting and Redirecting Routes
  • Achievement

    Getting Started with React Router

    React Router 4 Basics

    Achieved

    May 13, 2018

    Getting Started with React Router
  • Achievement

    Putting it all Together

    Building Applications with React and Redux

    Achieved

    May 12, 2018

    Putting it all Together
  • Achievement

    Actions, Dispatch and Reducers. Oh my!

    Building Applications with React and Redux

    Achieved

    May 11, 2018

    Actions, Dispatch and Reducers. Oh my!
  • Achievement

    Modularizing the React Scoreboard Application

    Building Applications with React and Redux

    Achieved

    May 11, 2018

    Modularizing the React Scoreboard Application
  • Achievement

    Getting Started with Redux

    Building Applications with React and Redux

    Achieved

    May 11, 2018

    Getting Started with Redux
  • Achievement

    Component Lifecycle

    React Basics (retired)

    Achieved

    May 9, 2018

    Component Lifecycle
  • Achievement

    Designing Dataflow

    React Basics (retired)

    Achieved

    May 7, 2018

    Designing Dataflow
  • Achievement

    Stateful Components

    React Basics (retired)

    Achieved

    May 5, 2018

    Stateful Components
  • Achievement

    Thinking in Components

    React Basics (retired)

    Achieved

    May 3, 2018

    Thinking in Components
  • Achievement

    First Steps in React

    React Basics (retired)

    Achieved

    May 3, 2018

    First Steps in React
  • Achievement

    How to Install WordPress on Your Computer

    How to Install WordPress on Your Computer

    Achieved

    Aug 8, 2017

    How to Install WordPress on Your Computer
  • Achievement

    What Is WordPress?

    What Is WordPress?

    Achieved

    Aug 2, 2017

    What Is WordPress?
  • Achievement

    Introduction to Node.js

    Node.js Basics 2017

    Achieved

    Jul 31, 2017

    Introduction to Node.js
  • Achievement

    Classes

    Introducing ES2015

    Achieved

    Jul 23, 2017

    Classes
  • Achievement

    Objects and New Collection Types

    Introducing ES2015

    Achieved

    Jul 23, 2017

    Objects and New Collection Types
  • Achievement

    The Cooler Parts of ES2015

    Introducing ES2015

    Achieved

    Jul 23, 2017

    The Cooler Parts of ES2015
  • Achievement

    ES2015 Basics

    Introducing ES2015

    Achieved

    Jul 22, 2017

    ES2015 Basics
  • Achievement

    Quiz Practice Project

    Object-Oriented JavaScript (2015)

    Achieved

    Jul 20, 2017

    Quiz Practice Project
  • Achievement

    Prototypal Inheritance

    Object-Oriented JavaScript (2015)

    Achieved

    Jul 20, 2017

    Prototypal Inheritance
  • Achievement

    Constructor Functions & Prototypes

    Object-Oriented JavaScript (2015)

    Achieved

    Jul 20, 2017

    Constructor Functions & Prototypes
  • Achievement

    Introduction to Methods

    Object-Oriented JavaScript (2015)

    Achieved

    Jul 15, 2017

    Introduction to Methods
  • Achievement

    Using a jQuery Carousel

    Using jQuery Plugins

    Achieved

    Jul 13, 2017

    Using a jQuery Carousel
  • Achievement

    Add a Sticky Navigation Bar

    Using jQuery Plugins

    Achieved

    Jul 13, 2017

    Add a Sticky Navigation Bar
  • Achievement

    Introducing jQuery Plugins

    Using jQuery Plugins

    Achieved

    Jul 13, 2017

    Introducing jQuery Plugins
  • Achievement

    DOM Traversal

    Introduction to jQuery

    Achieved

    Jul 10, 2017

    DOM Traversal
  • Achievement

    DOM Manipulation

    Introduction to jQuery

    Achieved

    Jul 10, 2017

    DOM Manipulation
  • Achievement

    Events

    Introduction to jQuery

    Achieved

    Jul 9, 2017

    Events
  • Achievement

    Hello, jQuery!

    Introduction to jQuery

    Achieved

    Jul 9, 2017

    Hello, jQuery!
  • Achievement

    Improving the Application Code

    DOM Scripting By Example

    Achieved

    Jul 8, 2017

    Improving the Application Code
  • Achievement

    Editing and Filtering Names

    DOM Scripting By Example

    Achieved

    Jul 6, 2017

    Editing and Filtering Names
  • Achievement

    Adding and Removing Names

    DOM Scripting By Example

    Achieved

    Jul 6, 2017

    Adding and Removing Names
  • Achievement

    Traversing the DOM

    JavaScript and the DOM (Retiring)

    Achieved

    Jul 4, 2017

    Traversing the DOM
  • Achievement

    Responding to User Interaction

    Interacting with the DOM

    Achieved

    May 14, 2017

    Responding to User Interaction
  • Achievement

    Making Changes to the DOM

    JavaScript and the DOM (Retiring)

    Achieved

    May 8, 2017

    Making Changes to the DOM
  • Achievement

    Getting a Handle on the DOM

    JavaScript and the DOM (Retiring)

    Achieved

    May 8, 2017

    Getting a Handle on the DOM
  • Achievement

    The Browser Environment

    JavaScript and the DOM (Retiring)

    Achieved

    May 8, 2017

    The Browser Environment
  • Achievement

    CSS Layout Project

    CSS Layout Basics

    Achieved

    May 1, 2017

    CSS Layout Project
  • Achievement

    Page Layout with the Float Property

    CSS Layout Basics

    Achieved

    May 1, 2017

    Page Layout with the Float Property
  • Achievement

    Controlling Layout with CSS Display Modes

    CSS Layout Basics

    Achieved

    May 1, 2017

    Controlling Layout with CSS Display Modes
  • Achievement

    Getting Started with CSS Layout

    CSS Layout Basics

    Achieved

    Apr 30, 2017

    Getting Started with CSS Layout
  • Achievement

    Why Version Control Matters

    Git Basics

    Achieved

    Jul 29, 2015

    Why Version Control Matters
  • Achievement

    Custom Media Players

    HTML Video and Audio (Retired)

    Achieved

    Jul 10, 2015

    Custom Media Players
  • Achievement

    Captioning Video

    HTML Video and Audio (Retired)

    Achieved

    Jun 30, 2015

    Captioning Video
  • Achievement

    Media Basics

    HTML Video and Audio (Retired)

    Achieved

    Jun 30, 2015

    Media Basics
  • Achievement

    Chrome DevTools Basics

    Website Optimization

    Achieved

    Jun 25, 2015

    Chrome DevTools Basics
  • Achievement

    Handling Routes in Node.js

    Build a Simple Dynamic Site with Node.js

    Achieved

    Jun 19, 2015

    Handling Routes in Node.js
  • Achievement

    Creating a Simple Server in Node.js

    Build a Simple Dynamic Site with Node.js

    Achieved

    Jun 17, 2015

    Creating a Simple Server in Node.js
  • Achievement

    Building a Command Line Application

    Node.js Basics (2014)

    Achieved

    Jun 16, 2015

    Building a Command Line Application
  • Achievement

    Introduction to Node.js

    Node.js Basics (2014)

    Achieved

    Jun 14, 2015

    Introduction to Node.js
  • Achievement

    AJAX and APIs

    AJAX Basics (retiring)

    Achieved

    Jun 13, 2015

    AJAX and APIs
  • Achievement

    jQuery and AJAX

    AJAX Basics (retiring)

    Achieved

    Jun 12, 2015

    jQuery and AJAX
  • Achievement

    Programming AJAX

    AJAX Basics (retiring)

    Achieved

    Jun 11, 2015

    Programming AJAX
  • Achievement

    AJAX Concepts

    AJAX Basics (retiring)

    Achieved

    Jun 11, 2015

    AJAX Concepts
  • Achievement

    Traversing and Manipulating the DOM with JavaScript

    Interactive Web Pages with JavaScript

    Achieved

    Jun 9, 2015

    Traversing and Manipulating the DOM with JavaScript
  • Achievement

    Selecting Elements and Adding Events with JavaScript

    Interactive Web Pages with JavaScript

    Achieved

    Jun 8, 2015

    Selecting Elements and Adding Events with JavaScript
  • Achievement

    JavaScript and the DOM

    Interactive Web Pages with JavaScript

    Achieved

    Jun 3, 2015

    JavaScript and the DOM
  • Achievement

    JavaScript Objects

    JavaScript Loops, Arrays and Objects

    Achieved

    Jun 2, 2015

    JavaScript Objects
  • Achievement

    JavaScript Arrays

    JavaScript Loops, Arrays and Objects

    Achieved

    Jun 1, 2015

    JavaScript Arrays
  • Achievement

    JavaScript Loops

    JavaScript Loops, Arrays and Objects

    Achieved

    May 31, 2015

    JavaScript Loops
  • Achievement

    JavaScript Functions

    JavaScript Basics (Retired)

    Achieved

    May 31, 2015

    JavaScript Functions
  • Achievement

    JavaScript Conditional Statements

    JavaScript Basics (Retired)

    Achieved

    May 31, 2015

    JavaScript Conditional Statements
  • Achievement

    JavaScript Numbers

    JavaScript Basics (Retired)

    Achieved

    May 30, 2015

    JavaScript Numbers
  • Achievement

    JavaScript Variables

    JavaScript Basics (Retired)

    Achieved

    May 28, 2015

    JavaScript Variables
  • Achievement

    Introducing JavaScript

    JavaScript Basics (Retired)

    Achieved

    May 27, 2015

    Introducing JavaScript
  • Achievement

    Fundamental Concepts

    CSS Basics (2014)

    Achieved

    May 26, 2015

    Fundamental Concepts
  • Achievement

    Designing with the Latest Features

    CSS Basics (2014)

    Achieved

    May 26, 2015

    Designing with the Latest Features
  • Achievement

    Installing Programs

    Console Foundations

    Achieved

    May 26, 2015

    Installing Programs
  • Achievement

    Environment and Redirection

    Console Foundations

    Achieved

    May 26, 2015

    Environment and Redirection
  • Achievement

    Console Processes

    Console Foundations

    Achieved

    May 10, 2015

    Console Processes
  • Achievement

    Console Users and Permission

    Console Foundations

    Achieved

    Apr 8, 2015

    Console Users and Permission
  • Achievement

    Moving Around in the Console

    Console Foundations

    Achieved

    Apr 5, 2015

    Moving Around in the Console
  • Achievement

    Structuring Tables

    HTML Tables

    Achieved

    Mar 25, 2015

    Structuring Tables
  • Achievement

    Table Basics

    HTML Tables

    Achieved

    Mar 24, 2015

    Table Basics
  • Achievement

    Creating a Simple Drawing Application

    jQuery Basics (2014)

    Achieved

    Mar 24, 2015

    Creating a Simple Drawing Application
  • Achievement

    Creating a Password Confirmation Form

    jQuery Basics (2014)

    Achieved

    Mar 12, 2015

    Creating a Password Confirmation Form
  • Achievement

    Creating a Mobile Drop Down Menu

    jQuery Basics (2014)

    Achieved

    Mar 6, 2015

    Creating a Mobile Drop Down Menu
  • Achievement

    Creating a Simple Lightbox

    jQuery Basics (2014)

    Achieved

    Mar 1, 2015

    Creating a Simple Lightbox
  • Achievement

    Creating a Spoiler Revealer

    jQuery Basics (2014)

    Achieved

    Feb 26, 2015

    Creating a Spoiler Revealer
  • Achievement

    Introduction to jQuery

    jQuery Basics (2014)

    Achieved

    Feb 26, 2015

    Introduction to jQuery
  • Achievement

    Basic Layout

    CSS Basics (2014)

    Achieved

    Feb 16, 2015

    Basic Layout
  • Achievement

    The Box Model

    CSS Basics (2014)

    Achieved

    Feb 15, 2015

    The Box Model
  • Achievement

    Understanding Values and Units

    CSS Basics (2014)

    Achieved

    Feb 15, 2015

    Understanding Values and Units
  • Achievement

    Basic Selectors

    CSS Basics (2014)

    Achieved

    Feb 14, 2015

    Basic Selectors
  • Achievement

    Getting Started with CSS

    CSS Basics (2014)

    Achieved

    Feb 13, 2015

    Getting Started with CSS
  • Achievement

    Choosing Options

    HTML Forms

    Achieved

    Feb 11, 2015

    Choosing Options
  • Achievement

    Organizing Forms

    HTML Forms

    Achieved

    Feb 9, 2015

    Organizing Forms
  • Achievement

    Form Basics

    HTML Forms

    Achieved

    Feb 9, 2015

    Form Basics
  • Achievement

    JavaScript Objects

    JavaScript Foundations

    Achieved

    Feb 7, 2015

    JavaScript Objects
  • Achievement

    JavaScript Functions

    JavaScript Foundations

    Achieved

    Feb 1, 2015

    JavaScript Functions
  • Achievement

    JavaScript Arrays

    JavaScript Foundations

    Achieved

    Sep 11, 2014

    JavaScript Arrays
  • Achievement

    JavaScript Numbers

    JavaScript Foundations

    Achieved

    Sep 5, 2014

    JavaScript Numbers
  • Achievement

    JavaScript Strings

    JavaScript Foundations

    Achieved

    Sep 5, 2014

    JavaScript Strings
  • Achievement

    Introduction Variables

    JavaScript Foundations

    Achieved

    Sep 4, 2014

    Introduction Variables
  • Achievement

    Functions

    Introduction to Programming

    Achieved

    Sep 2, 2014

    Functions
  • Achievement

    Objects and Arrays

    Introduction to Programming

    Achieved

    Sep 2, 2014

    Objects and Arrays
  • Achievement

    Control Structures

    Introduction to Programming

    Achieved

    Sep 2, 2014

    Control Structures
  • Achievement

    Basics

    Introduction to Programming

    Achieved

    Sep 1, 2014

    Basics
  • Achievement

    Media Queries

    Unused CSS Stages

    Achieved

    Sep 1, 2014

    Media Queries
  • Achievement

    CSS Animations

    Unused CSS Stages

    Achieved

    Aug 25, 2014

    CSS Animations
  • Achievement

    Transitions and Transforms

    Unused CSS Stages

    Achieved

    Aug 16, 2014

    Transitions and Transforms
  • Achievement

    Flexbox and Multi-Column Layout

    Unused CSS Stages

    Achieved

    Aug 3, 2014

    Flexbox and Multi-Column Layout
  • Achievement

    Gradients

    CSS Foundations

    Achieved

    Aug 3, 2014

    Gradients
  • Achievement

    Web Typography

    CSS Foundations

    Achieved

    Jul 29, 2014

    Web Typography
  • Achievement

    Backgrounds and Borders

    CSS Foundations

    Achieved

    Jul 27, 2014

    Backgrounds and Borders
  • Achievement

    CSS Box Model

    CSS Foundations

    Achieved

    Jul 24, 2014

    CSS Box Model
  • Achievement

    Text, Fonts, and Lists

    CSS Foundations

    Achieved

    Jul 20, 2014

    Text, Fonts, and Lists
  • Achievement

    Values and Units

    CSS Foundations

    Achieved

    Jul 16, 2014

    Values and Units
  • Achievement

    Advanced Selectors

    CSS Foundations

    Achieved

    Jul 14, 2014

    Advanced Selectors
  • Achievement

    Selectors

    CSS Foundations

    Achieved

    Jul 9, 2014

    Selectors
  • Achievement

    Getting Started with CSS

    CSS Foundations

    Achieved

    Jun 9, 2014

    Getting Started with CSS
  • Achievement

    Forms

    HTML

    Achieved

    Jun 7, 2014

    Forms
  • Achievement

    Tables

    HTML

    Achieved

    Jun 7, 2014

    Tables
  • Achievement

    Objects

    HTML

    Achieved

    Jun 7, 2014

    Objects
  • Achievement

    Links

    HTML

    Achieved

    Jun 7, 2014

    Links
  • Achievement

    Lists

    HTML

    Achieved

    Jun 6, 2014

    Lists
  • Achievement

    Text

    HTML

    Achieved

    Jun 6, 2014

    Text
  • Achievement

    Introduction

    HTML

    Achieved

    Jun 6, 2014

    Introduction
  • Achievement

    Debugging HTML and CSS Problems

    How to Make a Website

    Achieved

    Jun 3, 2014

    Debugging HTML and CSS Problems
  • Achievement

    Sharing a Website

    How to Make a Website

    Achieved

    Jun 3, 2014

    Sharing a Website
  • Achievement

    Responsive Web Design and Testing

    How to Make a Website

    Achieved

    Jun 3, 2014

    Responsive Web Design and Testing
  • Achievement

    Adding Pages to a Website

    How to Make a Website

    Achieved

    May 31, 2014

    Adding Pages to a Website
  • Achievement

    Styling Web Pages and Navigation

    How to Make a Website

    Achieved

    May 30, 2014

    Styling Web Pages and Navigation
  • Achievement

    Customizing Colors and Fonts

    How to Make a Website

    Achieved

    May 29, 2014

    Customizing Colors and Fonts
  • Achievement

    CSS: Cascading Style Sheets

    How to Make a Website

    Achieved

    May 29, 2014

    CSS: Cascading Style Sheets
  • Achievement

    Creating HTML Content

    How to Make a Website

    Achieved

    May 29, 2014

    Creating HTML Content
  • Achievement

    HTML First

    How to Make a Website

    Achieved

    May 24, 2014

    HTML First
  • Achievement

    Beginning HTML and CSS

    How to Make a Website

    Achieved

    May 23, 2014

    Beginning HTML and CSS
  • Achievement

    Creating the Menu and Footer

    Build a Simple PHP Application

    Achieved

    May 14, 2014

    Creating the Menu and Footer
  • Achievement

    Getting Started with PHP

    Build a Simple PHP Application

    Achieved

    May 5, 2014

    Getting Started with PHP
  • Achievement

    Newbie

    Achieved

    May 5, 2014

    Newbie