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Hash Map

Hash map (ya hash table) ek data structure hai jo key-value pairs store karti hai aur O(1) average…

Overview
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Hash Map — Quick Facts

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Property: Detail

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Term: Hash Map (Hash Table)

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Category: Data Structure

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Type: Associative Array / Dictionary

Topic 1
📥 📥 🧠 🔬 💡 🎯

Infobox

📚 | Property | Detail | |---|---| | Term | Hash Map (Hash Table) | | Category | Data…
Topic 2
💡 📊 🔬

Real-Life Analogy

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Key = Contact name ("Anil")

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Value = Phone number ("9876543210")

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Tum sirf naam bolo → turant number…

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Hash map bhi yehi karta hai — key…

Topic 3
📥 ⚙️ 🔬 💡

How Hash Map Works

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Array size = 8 (buckets: 0 to 7)

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Key: "name" → hashCode = 3373752 →…

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Key: "age" → hashCode = 96354 →…

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Key: "city" → hashCode = 3059573 →…

Topic 4
⭐

Internal Structure Diagram

⭐ `mermaid graph TD subgraph HashMap["Hash Map (Internal)"] HF["Hash Function<br/>key →…
Topic 5
✨

Operations aur Time Complexity

🔑 | Operation | Description | Average Case | Worst Case | |---|---|---|---| | put(key,…
Topic 6
✨ 📊 🔬

Hash Collisions

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Possible keys = infinite (strings,…

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Buckets = limited (array size…

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Pigeonhole principle — zyada…

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Collision hone par O(1) guarantee…

Topic 7
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Collision Handling Strategies

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Har bucket me ek linked list (ya…

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Collision hone par naya entry same…

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Lookup: bucket jaao → list…

🎯

Java HashMap ye use karta hai…

Topic 8
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Load Factor aur Rehashing

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Load factor 0.75 (75%) typically…

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Load factor badh jaaye →…

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Load factor bahut kam ho → memory…

Topic 9
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Comparison: Hash Map vs Other Data Structures

📚 | Aspect | Hash Map | Tree Map (BST-based) | Linked List | Array | Hash Set |…
Topic 10
💡 📊 🔬

Language Implementations

💡 | Language | Hash Map Type | Notes | |---|---|---| | Python | dict | Ordered (insertion…
Topic 11
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Common Interview Patterns

🎯 Hash map sabse frequently asked data structure hai coding interviews me: 1. Two Sum —…
Comparison
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Comparison: Hash Map vs Other Data Structures

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Stores: Key-Value pairs

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Search: O(1) average

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Insert: O(1) average

Diagram
📥 ⚙️ 🔬 💡

Visual Flow

📊 Diagram visualization — details in narration
Related Topics

See Also

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Hash Function

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Hash Set

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Hash Table

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Array

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Linked List

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Binary Search Tree

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 1

Hash Map ka sabse sahi definition kya hai?

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 2

Hash Map ka 'Term' kya hai?

Complete! 🎉
COMPLETE

Hash Map Complete!

Aliens Wiki · HIEN · Cinematic Knowledge

✅

Hash Map Complete

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Hash Function

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