🧵 Sway vs Solidity: StorageMaps Both Solidity and Sway support persistent storage, but Sway’s StorageMap offers a more structured and type-safe approach. Let’s explore the key differences 👇

StorageMap Basics ➡️ Sway has a built-in StorageMap type for key-value storage. ➡️ It resembles Rust’s HashMap, but it’s optimized for the blockchain and FuelVM.

Mappings are defined as:

Declaration & Initialization No extra imports or explicit mutability needed, storage variables are inherently mutable.

Inserting Values Explicitly annotate functions with #[storage(write)] for storage modifications.

Reading Values Safe reads with built-in fallback handling through Option<V>.

Multi-Key & Nested Maps Tuples as keys:

Nested StorageMaps:

Advantages over Solidity ✅ Explicit, strong typing for keys and values. ✅ Clear, compiler-enforced storage read/write annotations. Learn more: