Storage Slots and Gas Optimization
Understand how Solidity lays out state variables into 32-byte storage slots and use that knowledge to write gas-efficient contracts.
Why Storage Costs Matter
Writing to contract storage is one of the most expensive operations on Ethereum. Understanding the storage layout lets you reduce slots written and save users real money.
The 32-Byte Slot
Contract storage is an array of slots, each 32 bytes (256 bits). State variables are assigned to slots in declaration order, starting at slot 0.
All lessons in this course
- State Variables and Storage Layout
- Mappings and Dynamic Arrays
- Events and Logging Data
- Storage Slots and Gas Optimization