We already know that the computer world has nothing but data.
There are different types of data (we call them data types), as follows:
Your name is a kind of data
Your age is data
Your grade is also data
Yet, they all are different. What is the difference between them? Your name only contains a group of characters or, as some people also call it, string. Your age is an integer type data. Your grade is a float type data. The wonderful thing in JavaScript is that you do not have to specify the data type before writing a variable's name.
Note
JavaScript allows working with three data types. Strings (for example, "This is an example of string"), numbers (for example, 2015, 3.1415, and so on), and Boolean (for example, true or false).
Did we discuss variables? Well, you already know the data types. You will need something to store your data. This something is called variable. In JavaScript, we use var before the variable names. Remember that var starts with small letter.
Let's consider the following...