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Christina Kopecky

Technical Writer

Christina is an experienced technical writer, covering topics as diverse as Java, SQL, Python, and web development. She earned her Master of Music in flute performance from the University of Kansas and a bachelor's degree in music with minors in French and mass communication from Southeast Missouri State. Prior to joining the Career Karma team in June 2020, Christina was a teaching assistant, team lead, and section lead at Lambda School, where she led student groups, performed code and project reviews, and debugged problems for students. Christina's technical content is featured frequently in publications like Codecademy, Repl.it, and Educative.

T Mobile Hiring Process: How to Land a Job at T Mobile in 2023
T Mobile jobs are favored by employees because of their attractive salaries and benefits packages. Thanks to its reputation, employee satisfaction rate, and quality customer service, working at T Mobile is an indirect platform to learn professional development. Understanding the T Mobile hiring process can give you an advantage if your goal is to land…
Let vs Var vs Const: What’s the Difference?
New features have been added to the JavaScript language with the release of ECMAScript6 (ES6). One such feature affects how we declare variables. With the addition of let and const, came all sorts of questions about when to use each of the variable declarations.  In this post, we talk about each of the options, with…
Using the Bootstrap Framework to Create a Carousel
When we think of a carousel, what usually comes to mind is the amusement park ride you may have ridden as a child – a big platform that rotates with colorful merry-go-round horses that go up and down as the ride progresses. A Bootstrap Carousel is not the fun fair variety we have come to…
Using the Bootstrap Framework to Create an Accordion
When we think of an accordion, what usually comes to mind is the musical instrument – a box shaped contraption that uses a keyboard or manual to push bellows – the “box” portion of the instrument – together and apart. A Bootstrap Accordion is not the musical instrument variety, but the concept has similarities. This…
Using the Bootstrap Framework to Create a Table
A table, in general, describes a relationship between a row with a set of columns. It’s a great way to organize and illustrate data. Bootstrap is a CSS framework that can help us create content super quickly. In this article, we review how to get Bootstrap set up, learn why we might need a table,…
SyntaxError: Unexpected Tokens in JSON
When working with JSON (JavaScript Object Notation), sometimes you might encounter an error that mentions Unexpected token < in JSON at position 0 or Unexpected token o in JSON at position 1.  These are just examples – you might encounter a different token or a different position number. In this article, we’ll take a look…
Using the Bootstrap Framework to Create a Navbar
A navbar is a user interface (UI) element that’s positioned at the top of a web page. It contains elements that make the navigational user experience more friendly by placing branding and navigational links that route to different components. In Bootstrap, we can use their documentation to create a navbar quickly that is fully functional…
Error: Unexpected end of input
Uncaught SyntaxError: Unexpected end of input. I know this very error has kept me up at night sometimes. Don’t sweat it! This article will talk about ways to help you debug your code so you can conquer this error and move on with your project. What does it mean? More likely than not, it means…
A Guide to Remove Spaces from String in JavaScript
In JavaScript, there are several different ways to filter out whitespace from a string. This article attempts to illustrate ways you can do that with the whitespace characters in your strings by showing you how to do it in five ways: Using LoopsUsing An Array Method: Split/Filter/Join MethodsUsing Array Methods: Split/JoinUsing Replace Method Using Loops…
JavaScript Date Object: How to Compare Dates
One thing we can do when solving coding problems is use the Date Object to compare dates and times to conditionally render certain logic in our code. This article takes a look at how to use the Date Object to compare two dates to see which one is the later (or earlier) date.  The Setup…
Dynamic Programming: An Introduction
In computer science there are several ways that describe the approach to solving an algorithm. Greedy, Naive, Divide-and-Conquer are all ways to solve algorithms. One such way is called dynamic programming (DP). In this article, we’ll take a look at what Dynamic Programming is, its characteristics, and the two main approaches to solving algorithms with…
JavaScript – Hello World
One of the very first programs you can write to make sure your Node version works is the “Hello World” program. There are two ways to create the program:  in the terminal or in your code editor of choice (i.e. Visual Studio Code, Vim, etc.). Make sure you have Node installed on your machine to…
Error: Cannot read property ‘setState’ of undefined
When you first start to write React components, you might encounter several different errors along the way. Two such errors are “Cannot read property ‘setState’ of undefined” and “this.setState is not a function”. This article takes a look at a couple of ways to make these errors go away.  Why? These errors occur because the…
Big O Notation, Part Two: Space Complexity
Note: If you haven’t read our article on time complexity, it’s recommended to start there. Part two of this series assumes you are familiar with different possible Big O values. In our first article about Big O Notation and time complexity, we talk about how much time it takes for the algorithm to complete when…
What Makes Up the LAMP Stack?
There are many ways to combine technologies to create a tech stack. One such stack is called the Linux, Apache, MySQL and PHP (LAMP) stack. For the last decade, using the Linux operating system, Apache Web Server, MySQL, and PHP has been a popular way to construct web apps. This article aims to talk about…
JavaScript: Equality Operators
There are four ways to compare equality in JavaScript. This article talks about the unique operators used to determine equality, what type coercion is, and some of the idiosyncrasies encountered when evaluating for a truthy or falsy value in the JavaScript language. Strict Equality Comparison The strict equality operator is represented by a triple equals…
Python Hello World: A How-To Guide
The Python "Hello World" program is usually the first program a coder will write in Python. This program uses a print statement to display a string to the Python console. The program looks like: print("Hello World"). One of the very first programs you can write to make sure your Python version works is “Hello World”.…
Big O Notation – Time Complexity
As software engineers, sometimes our job is to come up with a solution to a problem that requires some sort of algorithm. An algorithm, at a high level, is just a set of directions – the recipe to solve a problem. When do we get to a point where we know the “recipe” we have…
Python Interpreters: A Step-By-Step Guide
Python is super accessible to learn because Python Interpreters exist online without having to ensure you have the correct version of Python installed on your machine. In this article, we talk about what the Python Interpreter is and list some of the more popular, beginner-friendly interpreters available to use online.  How is a Python Program…
Java Compilers: A Step-By-Step Guide
Five to ten years ago, learning Java wasn’t as accessible as it is now. Back then, you had to download a Java Development Kit (JDK) that contained the compiler and interpreter to run on your machine. Now there are a multitude of Java compilers available to us free of charge online. In this article, we…
HTML vs CSS: What’s the Difference Between the Two?
An aspiring web developer learns HTML and CSS as part of their tech career training.In this article, we look at the difference between the two languages and two examples: one using HTML, the other using HTML and CSS. The hope is that you see the advantage to using CSS to make your markup more readable.…
Use the Bootstrap Framework to Create Tabs
Tabs are a user interface (UI) element that allow us to see different panes of information without using up extra space. Just like tabs in a binder or book, they mark a placement on the page for more information and are identified by what the pane of information contains. When you click on a tab,…
Using the Bootstrap Framework to Create a Modal
A modal is a window that is separate from the main window of a web page. It’s main purpose is to disable the main window from user interaction and to share information or confirm something with the user. Modal windows are popular to use as log-in components, confirmation of user input, or a myriad of…
How to Perform a JavaScript Redirect
There are several ways to redirect a web page: client side using the meta tag in HTML, and server side using HTTP redirect methods to name a few. In this article, we look at how to redirect a web page using JavaScript.  Two Methods There are two possible ways to use JavaScript code for page…
How to Perform an HTML Redirect
There may be times when you need to redirect your web traffic to a new site. There are multiple ways to perform a redirect, usually through the backend, but in this article we cover how to do it using a client side redirect in HTML. This redirect takes place in the head of your HTML…
Differentiating Between the Types of Spaces in HTML
In HTML, sometimes we need to create space, and it’s not as easy as just using the spacebar to create it. This is especially true if we need multiple spaces in a row or tabs – HTML tends to collapse those multiple spaces to one space. This is where HTML entities come in. In this…
A Guide to Using Quotes in HTML
There are several ways to cite sources or discern quotes from its surrounding text in HTML. Today, we go over the HTML Quotation Elements:  <blockquote>, <q>, <abbr>, <address>, <bdo> and <cite>. Each has their own unique use cases – we discern between each and show you how to use them in your markup. Blockquote The…
How to Open a Link in a New Tab Using HTML
When we want to direct a user to a third-party web page, the default behavior is for the link to go directly to that page in the same tab. You can keep users on your page by opening up the third-party external link in a new tab so your page is easy to navigate back…
SQL Triggers
An SQL Trigger is an event that sets off a number of other events that happens when a user interacts with a particular table. This particular SQL statement helps by validating form data, or enforcing rules. A trigger is executed either before or after the following events: INSERT – when a new row is inserted.UPDATE…
Using MySQL’s IF(), NULLIF(), and IFNULL() Functions
Just like other programming languages, the structured query language has conditional statements that control the flow of data. The IF function returns a statement if condition is met and another type statement (or none at all) if not met. Let’s look at the SQL IF function using MySQL.  Preparation This SQL Fiddle links to a…
SQL Substr() Function
Sometimes we need just a portion of a string value in our data to display. There is a string function we use called SUBSTR(). There is also an equivalent function called SUBSTRING(). In this article, we cover using this substring function in SQL.  Preparation Here is the SQL Fiddle used in this article. The schema…

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