Solidity
Solidity for EVM compatible smart contracts.
REPL
Learning Path
Fundamentals
Copy examples into Scaffold Eth then play around.
| Task | Done | Notes |
|---|---|---|
| Primitive Data Types | Y | boolean, uint, int, address |
| Mappings | T | Document best use cases |
| Structs | Y | Can written external to a contract and imported |
| Modifiers | Y | Clean up repetitive code, example auth checks |
| Events | Y | Cheap for of data storage |
| Inheritance | Y | Allows multiple |
| Payable | Y | Allows a method to recieve ether |
| Fallback | Y | Called when no method exists |
Global Variable and MSG
Explanatory Articles:
Random Numbers
No easy solution with Smart Contracts.
Oracles exist to solve this problem.
Mappings
Good for single value lookups.
Use instead of arrays to hold sets of data to save time and gas.
- Keys are not stored
- Values are not iterable
- Default value of type is returned
Default values, provides challenges.
Reference Types
| Name | Rules | Use When |
|---|---|---|
| Fixed Array | Single type of element; Size cannot change | |
| Dynamic Array | Single type of element; Size can change | |
| Mapping | Collection of entities | |
| Struct | Structure of an entity |
Testing Solidity
Packages
Javascript Bridge
- Cannot communicate nested dynamic arrays
- Strings in Solidity are dynamic arrays
Related
Diagrams
Resources