🧠 HashMap Problems

Welcome to the HashMap section of JDCodebase!

HashMaps (also called dictionaries or objects in JavaScript) are extremely useful in DSA for storing key-value pairs and counting frequencies. They offer constant-time average performance for inserts and lookups.

📘 What You’ll Learn

Count frequencies of characters, elements, or patterns
Track positions or occurrences efficiently
Design look-up and cache-based logic
Optimize brute force problems using HashMaps

🛠️ Common JavaScript Methods

const map = new Map() — create a new HashMap
map.set(key, value) — insert/update value
map.get(key) — get value for key
map.has(key) — check if key exists
map.delete(key) — remove key
map.size — number of key-value pairs

📝 Problems List