What Is Single Data Type?


Scott Campbell

Single Data Type is a fundamental concept in programming languages. It is used to store and manipulate single values or individual pieces of data. In this tutorial, we will explore what Single Data Type is and how it can be used in HTML programming.

What is Single Data Type?

In HTML, Single Data Type refers to a basic data type that can hold a single value. These values can be numbers, text, or boolean (true or false).

Types of Single Data Type

HTML supports several types of Single Data Types:

  • Number: This data type stores numeric values such as integers and floating-point numbers.
  • String: This data type stores textual data enclosed within quotes.
  • Boolean: This data type stores either true or false values.

Using Single Data Types in HTML

To declare and use Single Data Types in HTML, we need to use variables. A variable is a named container that holds a value of a specific data type.

To declare a variable, we use the <script> tag with the “type” attribute set to “text/javascript”. Within the script tag, we can declare variables using the keyword “var” followed by the variable name.

<script type="text/javascript">
  var numberVariable = 10;
  var stringVariable = "Hello World";
  var booleanVariable = true;

In the example above, we declared three variables: numberVariable, stringVariable, and booleanVariable. The value assigned to each variable corresponds to its respective data type.

Manipulating Single Data Types

Once we have declared variables, we can perform various operations on them.


In the case of strings, we can concatenate or combine two or more strings using the concatenation operator (+).

<script type="text/javascript">
  var firstName = "John";
  var lastName = "Doe";
  var fullName = firstName + " " + lastName;

The variable fullName will contain the concatenated value of firstName and lastName, resulting in “John Doe”.

Arithmetic Operations

In the case of numbers, we can perform arithmetic operations such as addition (+), subtraction (-), multiplication (*), and division (/).

<script type="text/javascript">
  var num1 = 10;
  var num2 = 5;
  var sum = num1 + num2;

The variable sum will contain the result of adding num1 and num2, resulting in 15.

Boolean Operations

With boolean values, we can perform logical operations such as AND (&&), OR (||), and NOT (!).

<script type="text/javascript">
  var isTrue = true;
  var isFalse = false;
  var result1 = isTrue && isFalse; // false
  var result2 = isTrue || isFalse; // true

In the examples above, result1 evaluates to false because both operands are not true. On the other hand, result2 evaluates to true because at least one operand is true.


Single Data Types are essential building blocks in HTML programming. They allow us to store and manipulate single values of different data types, including numbers, strings, and booleans. By using variables, we can declare and work with Single Data Types to perform various operations.

Now that you understand the concept of Single Data Type, you are ready to apply this knowledge in your HTML projects. Experiment with different data types and operations to enhance your coding skills!

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