cairo-storage-mappings

name	cairo-storage-mappings
description	Explain Starknet storage mappings with Map, hashing of keys, and read/write patterns; use when a request involves mapping-like storage in Cairo.

Cairo Storage Mappings

Overview

Guide use of storage mappings, key hashing, and constraints around Map types.

Quick Use

• Read references/storage-mappings.md before answering.
• Use Map<key, value> only in storage structs.
• Access with .read(key) and .write(key, value).

Response Checklist

• Remind that Map types cannot be instantiated as regular variables.
• Note that mappings are not iterable and return default values for missing keys.
• Mention that key hashing chains through multiple keys when needed.

Example Requests

• "How do I store balances by address in storage?"
• "Can I iterate over a storage mapping?"
• "How does Starknet hash mapping keys?"