What are data types in javaScript

In JavaScript, data types refer to the classification or categorization of values that a variable can hold. JavaScript is a dynamically typed language, which means that you don't need to explicitly declare the data type of a variable; the interpreter determines the data type dynamically during runtime.

Here are the main data types in JavaScript:

  1. Primitive Data Types:
    • String: Represents textual data, e.g., "Hello, World!".
    • Number: Represents numeric values, e.g., 42 or 3.14.
    • Boolean: Represents either true or false.
    • Undefined: Represents the absence of a value or an uninitialized variable.
    • Null: Represents the intentional absence of any object value.
  2. Special Values:
    • NaN (Not a Number): Represents a value that is not a legal number.
    • Infinity and -Infinity: Represent positive and negative infinity, respectively.
  3. Composite Data Types:
    • Object:Represents a collection of key-value pairs and is a fundamental building block in JavaScript.
    • Array: Represents an ordered list of values and is a specialized type of object.
    • Function: Represents a reusable set of statements.
  4. Derived Data Types:
    • RegExp (Regular Expression):Represents a pattern used for matching character combinations in strings.
    • Date:Represents a specific point in time.

JavaScript is loosely typed, meaning that a variable can hold values of any type, and its type can be changed during runtime. For example, a variable initially assigned a number can later be assigned a string or another type of value.

Here's an example illustrating some of the data types in JavaScript:

            // Primitive data types
            let str = "Hello, World!";   // String
            let num = 42;                // Number
            let isTrue = true;           // Boolean
            let undef;                   // Undefined
            let n = null;                // Null
            // Composite data types
            let obj = { key: "value" };  // Object
            let arr = [1, 2, 3];         // Array
            let func = function() {};    // Function
            // Special values
            let notANumber = NaN;         // NaN
            let positiveInfinity = Infinity; // Infinity
            // Derived data types
            let regex = /pattern/;       // Regular Expression
            let today = new Date();       // Date            

Understanding these data types is crucial for working with variables and performing operations in JavaScript.

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