Cairo Dictionaries

Overview

Guide correct creation and use of Cairo dictionaries with proper ownership and performance notes.

Quick Use

• •Read references/dictionaries.md before answering.
• •Show minimal snippets using Felt252Dict plus Felt252DictTrait methods.
• •Mention squashing and cost implications when discussing performance.

Response Checklist

• •Use Felt252Dict::<T>::default() to initialize.
• •Use insert and get for basic operations; use entry/finalize for advanced patterns.
• •Remind that keys are felt252 and values are generic T.
• •Call out that dictionary access is linear in the number of entries and squashing occurs on destruction.

Example Requests

• •"How do I store balances by address in Cairo?"
• •"Why does get return a default value sometimes?"
• •"What is dictionary squashing and when does it happen?"

Cairo by Example

• •Dictionaries