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JS101: Jumpstart Your Journey to Learning JavaScript

Hey there! It's great to have you along for the beginner's JavaScript journey. We've already covered HTML and CSS in previous articles, and now it's time to dive into JavaScript. In this article, we'll give you an overview of what JavaScript is all about and answer questions like "What is JavaScript?" and "What can you do with JavaScript?". Our main objective is to make sure you feel confident and clear about what JavaScript is all about.

No problem if you haven't checked out the articles yet! You can easily find them at these super convenient links:

JavaScript is the magic behind making your web pages come to life! It's a scripting or programming language that allows you to add all sorts of cool and interactive features. Think of dynamic content updates, interactive maps, eye-catching animations, and even musical video players! Whenever a website goes beyond just showing plain old information, you can bet that JavaScript is playing a part in the excitement. So, the third layer of the layer cake of the standard web technologies "JavaScript" is something we'll be talking about. But don't worry, we've already gone over the first two layers (HTML and CSS) in great detail in other sections of the Learning Area.

To make it simple, let me break it down for you.

HTML - is like the backbone of a web page, it gives all your content shape and meaning. CSS - is like makeup, it adds some flair and style to the page to make it look pretty. JavaScript - is like special effects, it brings your page to life by adding dynamic and interactive elements.

Together, these three technologies create stunning and functional web pages that we see all over the internet today. By using HTML for structure, CSS for styling, and JavaScript for interactivity, you can create websites that are not only practical but also visually appealing!

Get ready to embark on an amazing JavaScript journey! We've got a fun surprise waiting for you. In just 100 seconds, this video will give you a lightning-fast and simple overview of all things about JavaScript. Let's have a blast and learn everything there is to know about this amazing language together! So buckle up, and let's get started!

JavaScript in 100 Seconds

javascript in 100 seconds

What is Java Script?

JavaScript is a powerful and versatile programming language that is used to create dynamic and interactive web pages. It was first introduced in 1995 and has since become an essential tool for web developers. JavaScript is primarily used for client-side scripting, meaning that it runs in the user's web browser rather than on the web server. This allows it to provide a more dynamic and responsive user experience, making it an indispensable part of the modern web.

What can you do with JavaScript?

JavaScript can be used to add a wide range of functionality to web pages. For example, it can be used to create dynamic drop-down menus, validate form inputs, create animations and effects, and much more. JavaScript is also used to create interactive games, tools, and applications. One of the most important things to know about JavaScript is that it is an event-driven language, meaning that it responds to events that occur on a web page, such as a user clicking a button. This allows developers to create truly dynamic and interactive web pages that respond to user interactions in real time.

How does JavaScript work?

JavaScript is a scripting language, which means that it is interpreted rather than compiled. This means that when a web page is loaded, the JavaScript code is parsed by the web browser and executed immediately. This is in contrast to compiled languages like C++, where the code must first be translated into machine code before it can be executed. One of the key benefits of JavaScript is that it is a lightweight and fast language, making it ideal for client-side scripting. JavaScript is also highly flexible and can be used in a variety of different environments, including web browsers, servers, and standalone applications.

JavaScript, HTML, and CSS

JavaScript, HTML, and CSS are the three musketeers of web development. JavaScript adds dynamic magic, but it needs HTML and CSS to create a complete and functional web page. Without HTML's structure and content or CSS's styling and layout, JavaScript would be lost and unable to perform its magic. Together, they make a winning team!

HTML adds structure and meaning to text labels, making them meaningful elements on a web page. It's like magic!

Let me give you a simple example.

Embedding JavaScript in HTML

JavaScript can be embedded directly into an HTML file using the < script > tag. You can either place the < script > tag in the head of the HTML document, or you can place it at the end of the body of the HTML document.

The following is an example of how you can embed JavaScript in an HTML file:

<!DOCTYPE html> <html> <head> <title>My First JavaScript Program</title> </head> <body> <h1>Hello World!</h1> <script> alert("Hello World!"); </script> </body> </html>

In this example, the JavaScript code is contained within the < script > tag and is executed when the HTML file is loaded into the web browser. When the code is executed, an alert box with the message "Hello World!" will be displayed.

Embedding JavaScript in CSS

JavaScript can be used in CSS in several ways. One of the most common ways is to manipulate the styles of HTML elements dynamically based on certain conditions. This is done by accessing the style property of an element, which represents the inline style of the element, and changing its values.

For example, consider the following HTML code:

<button id="myButton">Click Me</button>

The following JavaScript code can be used to change the background color of the button when it is clicked:

var button = document.getElementById("myButton"); button.addEventListener("click", function() { = "red"; });

In this example, the button element is first retrieved using document.getElementById("myButton") and an event listener is added to the button using addEventListener("click", function). When the button is clicked, the event listener will trigger and the style.backgroundColor property of the button will be set to "red", changing the background color of the button.

JavaScript can also be used to dynamically apply styles to elements based on the state of the page or the data it contains. For example, you could use JavaScript to apply styles to elements based on the current screen size or the presence of certain elements on the page.

In addition to changing the styles of elements directly, JavaScript can also be used to change the values of CSS variables. CSS variables, also known as custom properties, allow you to define reusable values that can be used throughout your stylesheet. The values of CSS variables can be changed using JavaScript, which allows you to create dynamic styles that respond to user interactions and other events.

Variables in JavaScript

Variables in JavaScript are used to store data. You can declare a variable in JavaScript using the var keyword. For example:

var name = "John Doe";

In this example, a variable named name is declared and assigned the value "John Doe". You can also declare variables using the let and const keywords. The difference between var, let, and const is the scope of the variable and the ability to reassign the variable.

Data Types in JavaScript

There are several data types in JavaScript, including:

  • String: A string is a sequence of characters, such as "Hello World!". Strings are defined using quotes, either single quotes (') or double quotes (").
  • Number: A number is a numeric value, such as 42 or 3.14.
  • Boolean: A boolean is a value that can either be true or false.
  • Null: The null value represents a deliberate non-value.
  • Undefined: The undefined value is assigned to a variable that has been declared, but has not been assigned a value.

Operators in JavaScript

Operators are symbols that are used to perform operations on values. Some of the most common operators in JavaScript include:

  • Arithmetic Operators: +, -, *, /, %c(modulus), ++ (increment), and -- (decrement).
  • Comparison Operators: == (equal to), != (not equal to), === (strict equal to), !== (strict not equal to), > (greater than), < (less than), >= (greater than or equal to), and <= (less than or equal to).
  • Logical Operators: && (and), || (or), and ! (not).

Control Structures in JavaScript

Control structures are statements that control the flow of execution of a program. Some of the most common control structures in JavaScript include:

  • if statement: The if statement is used to execute a block of code only if a specified condition is true. For example:
if (age >= 18) { console.log("You are an adult"); }
  • if...else statement: The if...else statement is used to execute one block of code if a condition is true, and another block of code if the condition is false. For example:
if (age >= 18) { console.log("You are an adult"); } else { console.log("You are a minor"); }
  • switch statement: The switch statement is used to select one of many blocks of code to be executed. For example:
switch (day) { case "Monday": console.log("Today is Monday"); break; case "Tuesday": console.log("Today is Tuesday"); break; case "Wednesday": console.log("Today is Wednesday"); break; default: console.log("Today is some other day"); }
  • for loop: The for loop is used to execute a block of code repeatedly, a specified number of times. For example:
for (var i = 0; i < 5; i++) { console.log("The value of i is: " + i); }
  • while loop: The while loop is used to execute a block of code repeatedly, as long as a specified condition is true. For example:
var i = 0; while (i < 5) { console.log("The value of i is: " + i); i++; }

Functions in JavaScript

Functions are blocks of code that can be called from other parts of the program. Functions can accept parameters, which are values that can be passed to the function when it is called. For example:

function greet(name) { console.log("Hello " + name); } greet("John Doe"); // Output: Hello John Doe

In this example, the greet function is defined and accepts a parameter named name. The function then outputs a message that includes the value of the name parameter. The function is then called and passed the value "John Doe".

Arrays in JavaScript

An array is a collection of values that can be stored in a single variable. Arrays are declared using square brackets ([]) and values are separated by commas. For example:

var names = ["John", "Jane", "Jim"];

In this example, an array named names is declared and assigned the values "John", "Jane", and "Jim". Arrays are indexed, meaning that you can access individual elements of the array by their position in the array. The first element of an array has an index of 0. For example:

console.log(names[0]); // Output: John

In this example, the first element of the names array is accessed using the index 0 and the value "John" is output.

Objects in JavaScript

An object is a collection of properties, each of which has a name and a value. Objects are declared using curly braces ({}) and properties are separated by commas. For example:

var person = { firstName: "John", lastName: "Doe", age: 30 };

In this example, an object named person is declared and assigned properties firstName, lastName, and age, with respective values "John", "Doe", and 30. The properties of an object can be accessed using dot notation. For example:

console.log(person.firstName); // Output: John

In this example, the firstName property of the person object is accessed and the value "John" is output.

Event Handling in JavaScript

Event handling is the process of detecting and responding to events, such as a user clicking a button, in a web page. Event handling is an important part of making dynamic, interactive web pages. For example:

<button id="myButton">Click Me</button> <script> var button = document.getElementById("myButton"); button.addEventListener("click", function() { console.log("Button was clicked"); }); </script>

In this example, a button element is defined in the HTML and given an id of "myButton". In the JavaScript code, the button element is retrieved using document.getElementById("myButton") and an event listener is added to the button using addEventListener("click", function). When the button is clicked, the event listener will trigger and the message "Button was clicked" will be output.

Recommended JavaScript Books for Beginners

Feeling fortunate? Look no further! We've curated a fantastic list of beginner-friendly books to help you tackle JavaScript with ease. Whether you're a complete newcomer or looking to brush up on your skills, these books are sure to provide a fun and educational experience. Happy reading!

Here are the top most recommended books to learn JavaScript for Beginners:

  1. A Smarter Way to Learn JavaScript by Mark Myers
  2. Secrets of the JavaScript Ninja by John Resig, Bear Bibeault, and Josip Maras
  3. JavaScript: The Definitive Guide by David Flanagan
  4. Eloquent JavaScript by Marijn Haverbeke
  5. Head First JavaScript Programming: A Brain-Friendly Guide by Elisabeth Robson
  6. JavaScript: The Good Parts by Douglas Crockford
  7. You Don't Know JS series by Kyle Simpson
  8. JavaScript and JQuery: Interactive Front-End Web Development by Jon Duckett
  9. Pro JavaScript Techniques by John Resig
  10. Learning JavaScript Design Patterns: A JavaScript and jQuery Developer's Guide 1st Edition by Addy Osmani

These guides will surely help you to learn all the necessary information on JavaScript. Make your journey to JavaScript enjoyable through these great resources!

Best Free JavaScript Video Tutorials for Beginners

Learning JavaScript is fun and confusing at times, but the good news is I have listed the 10 most recommended video tutorials for you to have access to anytime with these resources. Enjoy watching!

Here are ten YouTube video tutorials that are great for beginners looking to learn JavaScript:

  1. JavaScript Crash Course For Beginners
  2. JavaScript: Understanding the Weird Parts - The First 3.5 Hours
  3. How to use getElementByID in JavaScript? | JS For Beginners Ep. 2
  4. JavaScript in Half an Hour (Without jQuery!)
  5. JavaScript beginner tutorial 18 - complex conditions
  6. Introduction to JavaScript
  7. JavaScript Tutorial for Beginners: Learn JavaScript in 1 Hour
  8. Getting Started With Javascript | Javascript Tutorial For Beginners
  9. Make a JavaScript Drum Kit in Vanilla JS!
  10. Learn JavaScript - Full Course for Beginners

These video tutorials are easy to understand and fun to watch at the same time. No wonder these are the 10 best free JavaScript video tutorials. Cool right?

Whether you're looking to build a new career in web development or just want to enhance your skills, this JavaScript Courses for Beginners is the perfect place to start!


In conclusion, JavaScript is a game-changer in the world of web development, packed with power and versatility. It's a must-have skill for creating websites that really pop. Whether you're just a beginner or a seasoned coder, learning JavaScript opens up a whole world of opportunities. With the examples shared in this article, you're ready to jump in and start your JavaScript adventure. Happy coding!