JavaScript is one of the most popular programming languages in 2022. A lot of people are learning JavaScript to become front-end and/or back-end developers.
I've designed this JavaScript tutorial for beginners to learn JavaScript from scratch. We'll start off by answering the frequently asked q...
JavaScript Tutorial for Beginners: Learn JavaScript in 1 Hour
Programming with Mosh
In this 3-minute introduction , I ‘m going to answer four frequently asked questions about JavaScript.
What is JavaScript, what can you do with it, where does JavaScript code run and what is the difference
between JavaScript and ECMAScript. The average salary of a JavaScript developer in the United States is
$ 72,000 a year. Every browser has a JavaScript engine and we can easily write JavaScript code here
without any additional tools of course this is not how we build real-world applications but this is just for
a quick demo. In order to write javascript code you need a code editor there are various code editors
out there including Visual Studio code or yes code sublime text atom. Live server is a lightweight web
server that we ‘re going to use to serve our web application so install this then you will have to restart
Visual Studio code when you ‘re done go to the Explorer tab right click index. Html and select open with
live server. This will open up Chrome or your default browser and point it to this address that’s where
web application is served from now.
JavaScript is a statement a statement is a piece of code that expresses an action to be carried out in this
case we want to log a message on the console. All statements in JavaScript should be terminated by a
semicolon. In JavaScript we can add some description to our code and this description is ignored by the
JavaScript engine. In this lecture I ‘m assuming that you have installed node on your machine if not head
over to node. Js org and download the latest version of node. Combine these files into a bundle and
serve that bundle to the client. Save the changes back in the browser you can still see the hello world
message and that confirms that our code is still working. A variable is one of the most fundamental
concepts in JavaScript and any other programming languages in programming. We use a variable to
store data temporarily in a computer ‘s memory. We store our data somewhere and give that memory
location and name and with this name we can read the data at the given location in the future. The best
practice is to use the lead keyword to declare a variable.
The modern best practice Is to declare each variable on a single line so we terminate this first
declaration with a semicolon and declare the second variable on new line that ‘s the modern best best
practice next we ‘re going to look at constants alright now let ‘s declare a variable called interest rate so
let interest rate and we set this to 0. 3 now this is the initial value. The best practice is to use a constant
so the value of a variable as the name implies can change but a constant can not change so here if we
change let to Const now interest rate will be a constant. In situations where we want to have some logic
for example if the order is approved then it needs to be shipped. JavaScript is a dynamic language so
unlike other programming languages the type of these variables will be determined at runtime based on
the values that we assigned to them. In JavaScript unlike other languages we don’t have two kinds of
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