Javascript Course – Learn JavaScript with Online Courses

JavaScript is a programming language that has become extremely popular over the last few years. It is especially useful for building web applications because it works on almost all platforms, including mobile devices. You can use JavaScript to create interactive websites and apps, create rich user experiences, or even build games or other applications with your own code!

JavaScript code is always in use; you just might not be aware of it. It drives dynamic behaviour on websites (like this one) and is crucial to numerous industries, including virtual reality, game and mobile development, front- and back-end engineering, and more. You will master the fundamentals of JavaScript in this course, which will be useful as you delve further into more complex subjects.

What is Javascript

JavaScript is an open-source programming language that was developed by Brendan Eich in 1995. It is used to create interactive effects on web pages, such as menus and popups. JavaScript is a scripting language, which means that it is not compiled into machine code before execution; instead, it’s interpreted by the browser as instructions for how your page should look and behave.

JavaScript can also be used to create client side applications (like Google Analytics) or server side applications (like web hosting).


JavaScript in HTML

JavaScript is a scripting language, which means it’s not meant to be used in the same way that other programming languages like C or Java are. Instead of being compiled into machine code (like C), JavaScript runs on the client-side and can be interpreted directly by your web browser.

JavaScript is also dynamic: unlike statically typed languages such as C++ and Java, you don’t need to declare variables before using them. This makes for more flexibility when writing code but can sometimes lead to errors if you’re not careful about how variables are declared.

It’s important to note that although JavaScript has been around since 1995—and thus was first released under open source licensing—it isn’t really considered an “active” language anymore because there aren’t many new features being added every year like there were back in those early days after its creation by Netscape Navigator creator Brendan Eich (who now works at Mozilla).

The Script Tag

The script tag is used to include JavaScript in an HTML file. The opening tag must be and the closing tag must be .

The script tag is a good way for you to embed code into your web pages, so that users can interact with it without having to download any additional files or plugins from the server.

Using JavaScript in HTML Pages

You can use JavaScript in HTML pages.

JavaScript is a programming language that you can use to add interactivity and animation to your website. It allows you to add validation functionality to forms, as well as adding visual effects like fading images or creating animations.

Scripts and Libraries

When you’re working on a JavaScript project, it’s important that your code is organized in an efficient way. Scripts and libraries are tools that help with this process.

  • What is a Script?

A script is a piece of code that runs at runtime. It can be used by itself or as part of another library or web application (for example, jQuery). The advantage of using scripts instead of just using plain old HTML forms or JavaScript files means that they can be reused across multiple projects without having to be manually modified each time they’re used in different contexts.*What is a Library? A library provides access to reusable functions and data types for use within your applications.*How do I add scripts and libraries to my page/project? You’ll want to find the relevant files from the project directory structure into which you’re copying them; then open up those files up in either TextEdit (Mac) or Notepad++ (PC). Once there, if you see something like “js/main” where we’ll put our main JS file… copy over everything after this point until all else looks like regular text! If there are any references made elsewhere such as when referencing external CSS files etc., make sure those matches up too before moving forward!”


Remarks are notes to yourself. They can be used to document your code, add a description to a function or method, or add a description to an object.

For example:

`1) Call the function “addNumbers” with two arguments – one integer and another integer (the sum).

  • Call the function again with three arguments – two integers and one string (the product).`

JavaScript Basics

JavaScript is a programming language that you can use to add interactivity and dynamic content to your web pages. It’s one of the most popular languages in use today, and it’s used on websites like Google Maps and Facebook.

JavaScript is a client-side scripting language that runs in the browser (that means it runs on your computer). The browser interprets these scripts to make web pages appear interactive; for example, when you click an anchor tag on a page with JavaScript code embedded within it then that click will cause something to happen (e.g., show up another page).

Comments and Statements

Comments are used to explain what is going on in the code. They can be used to explain complex or confusing code, or why a particular piece of code was written.

  • /** The body of this function should be empty. */
  • In this example, you see how comments can be used to explain what is going on in the code. They allow you to give more detail about what each part does and how it works together as a whole when working with JavaScript (or any programming language).


Your variable names can contain any combination of letters, numbers, and the underscore character. They must begin with a letter or an underscore character (and cannot be a JavaScript keyword).

For example:

var myVariable = “myVariable”;

var myOtherVariable = “myOtherVariable”;

  • You could also use spaces in your variable names if you want to keep them organized. But make sure that you don’t use any other special characters like $ or % because they’re reserved for other parts of JavaScript such as functions and variables!*

Data Types and Values

In JavaScript, there are a number of primitive data types. Primitive data types include integers (1, 2, 3), floating-point numbers (3.14159), strings (“abc”, ‘abc’), and booleans (true and false).

JavaScript also has object data types like arrays and the function keyword that can be used to define objects with properties or methods. An object can contain any kind of value except another object; this is called encapsulation because it keeps objects from interacting with each other directly. Objects are often used for implementing business logic in JavaScript programs because they allow us to create reusable components that can be reused throughout an application instead of having to create them again each time we need one specific piece of functionality

Arithmetic Operators

JavaScript has a few arithmetic operators, which are used to perform mathematical operations. Here’s what they do:

  • + – * / %

In addition to these basic arithmetic operators, JavaScript also has binary (two-digit) and unary (one-digit) negative numbers. A negative number is one with a sign of minus in front of it; for example, -3 means three minus three or -1

Comparison Operators

Comparisons allow you to determine whether two values are equal, unequal or in order. You can compare an object with its prototype.

Comparison operators are mostly used with variables and literals, but they also have some special cases for comparing objects themselves (and even for comparing functions).

Logical Operators

Logical operators are used to manipulate boolean values. They can be applied to expressions, which makes them very useful in programming, especially if you’re dealing with data that needs to be processed by your application.

The logical operators are:

  • NOT, AND and OR. These three operators perform a logical operation on the values of their operands:

NOT(a == true) *AND*(a == false) *OR* (a == true) -NOT(a == false).

Expressions and Evaluations

Expressions are values that can be used in expressions. An expression is any text that contains one or more operators and operands, such as numbers, strings, booleans (true/false), and functions.

Expressions are evaluated when they’re used in an expression context: a statement or block of JavaScript code; a function call; an object property accessor; etc. The result of evaluating an expression depends on its type: if it’s a primitive value like 8 or false , then there will be no change after evaluation; if it’s an object literal which has methods attached to it (e.g., { method() } ), then those methods will execute when their names are called during evaluation—but only once per invocation!

Code Blocks, Functions, and Scope

Code blocks, functions and scope

In this section we will learn how to use code blocks, functions and scope.

JavaScript Objects, Arrays, and JSON

JavaScript objects, arrays and JSON are the three basic building blocks of programming.

In this lesson you will learn how to work with these objects by creating your own functions that use them. You’ll also learn about some common uses for them in JavaScript programs.

Course on Javascript

You will learn how to install and use Node.js, the open-source JavaScript platform for building fast, scalable network applications. You’ll learn how to use it to build web applications, command line tools, desktop apps and other things that are useful in a wide range of industries.

Node.js has many features that make it an excellent choice for building fast networking solutions:

  • It’s cross-platform—you can run Node on Windows or Mac OS X machines (or Linux).
  • It supports asynchronous programming with callbacks instead of callbacks being synchronous; this makes it easier for programmers familiar with C++/C# languages such as Java or Python because they already know how these languages work!

The course covers the basic concepts of programming using JavaScript. You will learn how to write and use functions, variables, expressions, objects and arrays in JavaScript.

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