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compact-core:ledger-adts
Use when working with Compact on-chain state management using ledger ADTs including Cell, Counter, Map, Set, List, MerkleTree, or HistoricMerkleTree, or when needing to understand which operations are available in Compact vs TypeScript.
SKILL.md
Full skill instructions
Ledger ADTs
Reference for Midnight's ledger abstract data types for on-chain state management.
Available ADTs
| ADT | Purpose | Key Operations |
|---|---|---|
Cell<T> | Single mutable value | read, write |
Counter | Increment-only counter | increment, value |
Map<K, V> | Key-value storage | lookup, insert, remove |
Set<T> | Membership collection | member, insert, remove |
List<T> | Ordered collection | append, nth, length |
MerkleTree<T> | Membership proofs | insert, root, pathForLeaf |
HistoricMerkleTree<T> | Historical roots | Same + resetHistory |
Quick Examples
Counter
ledger counter: Counter;
export circuit increment(): Uint<64> {
counter.increment(1);
return counter.value();
}
Map
ledger balances: Map<Bytes<32>, Uint<64>>;
export circuit get_balance(user: Bytes<32>): Uint<64> {
const result = balances.lookup(user);
return if result is Maybe::Some(balance) { balance } else { 0 };
}
MerkleTree
ledger members: MerkleTree<Bytes<32>>;
export circuit prove_membership(
leaf: Bytes<32>,
path: Vector<Bytes<32>, 20>
): Boolean {
const computed_root = merkleTreePathRoot(leaf, path);
return computed_root == members.root();
}
Compact vs TypeScript Operations
Some ADT operations are only available in TypeScript:
| ADT | Compact | TypeScript Only |
|---|---|---|
| Counter | value, increment | - |
| Map | lookup, insert, remove | entries, keys |
| Set | member, insert, remove | entries, size |
| List | nth, append | entries, length |
| MerkleTree | insert, root | pathForLeaf, iteration |
References
- Counter - Counter operations and patterns
- Collections - Map, Set, List operations
- Merkle Trees - MerkleTree and HistoricMerkleTree
- Kernel - Special kernel operations
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