Data Types

This code snippet demonstrates how various data types are used in JavaScript:

// Primitive types
let name = "Alice";            // String
let age = 25;                  // Number
let isStudent = true;          // Boolean
let unknown = undefined;       // Undefined
let empty = null;              // Null
let id = Symbol("id");         // Symbol
let bigIntValue = 123456789012345678901234567890n; // BigInt

// Reference types
let person = { name: "Alice", age: 25 }; // Object
let colors = ["red", "green", "blue"];   // Array
function greet() { console.log("Hello"); } // Function
          

This code demonstrates:

• Declaration and usage of primitive data types
• Creation of object and array reference types
• Usage of BigInt and Symbol for special use cases

• Primitive Types: These include string, number, boolean, null, undefined, symbol, and bigint. They are immutable and stored by value.
• Reference Types: Includes objects, arrays, and functions. These are mutable and stored by reference.

• Web Development: Store user inputs, preferences, and responses.
• APIs and Backend: Handle structured data with objects and arrays.
• Form Validation: Check and enforce types for user input fields.
• Data Structures: Build complex logic using objects and arrays as data containers.