AgentSkillsCN

cairo-storage-mappings

当请求涉及在 Cairo 中优化存储成本、打包数值，或运用位运算时，讲解如何减少存储槽位，或在 Cairo 中实现紧凑型存储。

SKILL.md
--- frontmatter
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?"