JavaScript Data Types
Quick Guide to Primitives and Objects
Primitive Data Types 🪨
JavaScript offers a set of fundamental data types, known as primitive types, that represent basic data values. These include:
Number 🔢
Represents both integers and floating-point numbers. Examples: 42, 3.14, -0.5. Special values include Infinity, -Infinity, and NaN (Not-a-Number).
String 🔤
Used for text. Strings can be enclosed in single quotes, double quotes, or backticks. Examples: 'hello', "world", `Hello, ${name}!`.
Boolean 🔦
Represents logical values: true or false. Example: let isActive = true;.
Undefined ✨
A declared variable without an assigned value. Example: let x; // x is undefined.
Null 🕳️
Represents the intentional absence of any value. Example: let y = null;.
Symbol 🔣
Unique and immutable values are often used as object keys. Example: let sym = Symbol('description');.
BigInt ☀️
For integers beyond the safe integer range of Number type. Example: let bigInt = 1234567890123456789012345678901234567890n;.
Non-Primitive Data Types (Objects) 🔥
While primitive types handle basic data, JavaScript also provides more complex data structures to organize information:
Object 🍎
Stores collections of data and more complex entities. Example: let person = { name: 'John', age: 30 };.
Array 🏎️🚙🚓🚗
An ordered collection of values. Example: let arr = [1, 2, 3, 4];.
Function 🏭
A block of code for performing tasks. Example: function greet() { return 'Hello'; }.
Date 📅
Handles dates and times. Example: let now = new Date();.
RegExp 🧬
Pattern matching within strings. Example: let regex = /ab+c/;.
Map and Set 🗺️
Map holds key-value pairs; Set holds unique values. Examples: let map = new Map();, let set = new Set();.
