Strings can store in single quotes or double-quotes. Represent a sequence of characters such as “ Hello World”. Numbers: Represents numeric values and can store integers and decimals.Boolean: logical entity having values as true or false.JavaScript mainly supports the following types of primitive data types. These are the predefined types of data that are supported by the programming language. Let's understand the details of all these data types in the following sections. Handle many types of data, and based on that we can categorize all the supported dataTypes by JavaScript into two types: The JavaScript engine will dynamically use it based on the type of data assigned to the variable.

Which, in turn, means that users needn't explicitly specify the type of data to store in a variable. Moreover, different data items can be numerical values, alphanumeric values, decimals, boolean, etc.Īs we know that JavaScript is a dynamic type (loosely typed) language. Language it uses, or the operations that can perform on it. The values define a specific kind of data item it can take, the programming What is the Scope of Variables in JavaScript?Ī data type is a classification of data that tells the compiler or interpreter how the programmer wants to use the data. Rules for Variable Naming conventions in JavaScript? How to redeclare variables in JavaScript? Procedure to define multiple variables in a single step in JavaScript? How to declare and initialize the variable together? How to define, declare and initialiaze a variable in JavaScript?

Understanding Composite Data Types in JavaScript?.

In this article, let us deep-dive into a better understanding of DataTypes and Variables covering across the following topics:

Do you have to declare variables in JavaScript?.

Which variable is used to declare JavaScript?.

How do you declare and initialize a variable in JavaScript?.

What is the Scope of JavaScript Variables?.

How to Redeclare Variables in JavaScript?.

How to define multiple variables in a single step in JavaScript?.

How to declare and initialize the variable together?.

How to initialize a variable in JavaScript?.

How to declare a variable in JavaScript?.How to define a variable in JavaScript?.

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