Difference between array and object.

Let’s break down the difference between an array and an object in JavaScript (and generally in programming):

🔹 Array

Definition: An ordered collection of values (indexed by numbers).
Key: Uses numeric indexes (0, 1, 2, …).
Use case: Best when you need to store a list of items in order.
Methods: Has many built-in methods like .push(), .pop(), .map(), .filter(), .forEach().
Example: let fruits = ["apple", "banana", "mango"]; console.log(fruits[0]); // "apple"

Definition: A collection of properties in key–value pairs.
Key: Uses string (or symbol) keys, not numbers by default.
Use case: Best when you want to store data with labels or properties.
Methods: Doesn’t have array methods, but you can use Object.keys(), Object.values(), Object.entries().
Example: let person = { name: "John", age: 30, city: "Delhi" }; console.log(person.name); // "John" console.log(person["age"]); // 30

Feature	Array	Object
Data Structure	Ordered list	Key–value pairs
Indexing	Numeric (0,1,2,…)	String (or Symbol) keys
Use Case	Store multiple values in order	Store related data with labels
Built-in Methods	Many (push, pop, map, filter)	Fewer (Object.keys, values)
Iteration	Loops, `forEach`, `map`	`for...in`, `Object.keys()`

✅ Rule of Thumb:

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