JavaScript Tutorial Learn JavaScript

To better prepare you for the real world, we have 17 projects inspired by popular products. You can learn more in MDN’s JavaScript learning area, as well as in other parts of MDN. W3Schools maintains a complete JavaScript reference, including all HTML and browser objects. Create a variable called carName and assign the value Volvo to it. This tutorial will teach you JavaScript from basic to advanced. Conditional statements control behavior in JavaScript and determine whether or not pieces of code can run.

Once you assign a value with some type to a variable, you can later reassign the variable to host a value of any other type without any issues. JavaScript is also now widely used outside of the browser. The rise of Node.js in the last few years unlocked backend development, once the domain of Java, Ruby, Python, PHP, and more traditional server-side languages. An excellent resource for aspiring web developers — Learn JavaScript in an interactive environment, with short lessons and interactive tests, guided by automated assessment. In this module we will explore what APIs are, and how to use some of the most common APIs you’ll come across often in your development work. Spaced repetition has been proven to be a more effective learning method.

JS Versions

There are multiple different types of conditionals in JavaScript. This is a great short introductory course and Brad is an experienced developer who will walk you through all of this concepts in an easy to understand manner. This is a great short introductory course and Mosh is an experienced developer who will walk you through all of these concepts in an easy to understand manner. Then you can move onto this Odin Project course which will teach you more advanced concepts and have you building more advanced projects. This popular course has over 7 millions views on YouTube.

JavaScript Lessons

If you call this function, you’ll get some data printed to the console. In JavaScript we have a global scope, block scope and function scope. Now, to be able to use this syntax, the doSomething() function implementation must be a little bit special.

JS String

An identifier is a sequence of characters that can be used to identify a variable, a function, or an object. It can start with a letter, the dollar sign $ or an underscore _, and it can contain digits. Using Unicode, a letter can be any allowed character, for example, an emoji ?. I believe it’s a great choice for your first programming language ever. JavaScript is an actively evolving language and has changed greatly over the years.

  • In practice, you will most likely keep a well defined style and adhere to what people commonly use, and enforce this using a linter or a style tool such as Prettier.
  • It can be used for both Client-side as well as Server-side developments.
  • You can use the following operators to compare two numbers, or two strings.
  • Another way to define strings is to use template literals, defined inside backticks.

The dollar sign is commonly used to reference DOM elements. Without complicating your learning process with things that are outside of it, and provided by external ecosystems. For example, the console.log() line you can find in many code examples is not JavaScript. Instead, it’s part of the vast library of APIs provided to us in the browser. Sometimes it’s hard to separate JavaScript from the features of the environment it is used in. Other languages exist, but all must compile to JavaScript – or more recently to WebAssembly, but this is another story.

Start JavaScript Exercises

Comments are one of the most important parts of any program, in any programming language. They are important because they let us annotate the code and add important information that otherwise would not be available to other people (or ourselves) reading the code. Having previous experience with other programming languages might also help. JavaScript is the world’s most popular programming language. Whether you are an experienced programmer or not, this website is intended for everyone who wishes to learn the JavaScript programming language. is still under construction – If you wish to contribute tutorials, please click on Contributing Tutorials down below. JavaScript functions are reusable blocks of code that perform a specific task, taking some form of input and returning an output. In JavaScript, a boolean value is one that can either be TRUE or FALSE. If you need to know “yes” or “no” about something, then you would want to use the boolean function.