The downside of this is, of course, when you accidentally make a mistake, no one will tell you about it. In this example, we gave the square() function more than one argument, and it simply ignores the extra arguments and computes the square of the first one.Īnd if we passed too few arguments, those missing parameters will be assigned the value undefined instead of giving you an error. Numbers are the easiest because it works exactly like what you studied in your math class in elementary school. In this section, let’s talk about some different types of data that JacaScript can process. What a computer program does is essentially take some input data, process them, and then return some output data.

In the computer world, it’s all about data. Or you can install Node.js on your computer, which allows you to run JavaScript programs using command terminals. To execute the code, we can simply open a browser, go to Developer Tools -> Console: In this tutorial, we are going to have a lot of example code snippets. Today the language has been adopted by all the other major web browsers, and it has become one of the most popular programming languages in the world.

It was created in 1995 as a way to add programs to web pages in the Netscape Navigator browser. Number literals, according to JavaScript syntax, can be written with or without the decimal point.JavaScript is the first programming language we are going to introduce in this tutorial. There are a few types of literals we use, and they have their own rules to be followed. Literals define fixed values used in JavaScript. Note: the hyphens method does not work in JavaScript.

Keep in mind though that in JavaScript the identifier name usually begins with a lowercase letter ( firstName) Throughout the history of programming, there have been three most popular methods to achieve that: hyphens ( first-name), underscores ( first_name), and camel case ( FirstName).Ĭamel case is the default identifier writing method in JavaScript and many other programming languages. Whenever case sensitivity is relevant, it's important to have a clear standard of writing names that consist of more than one word. Note: same rules apply to keywords and other identifiers as well.

Java script basics