Index

Solidity

  1. types
  2. External
  3. Library
    1. self in Library
    2. using * for
    3. self example
  4. interfaces
  5. import
  6. msg.value
  7. Handling ether
  8. Erc20 token in contract
  9. assembly
  10. Enum
  11. memory, storage, calldata
  12. Array Pushing
  13. length in array
  14. Struct array
  15. mapping
  16. bytes and string
  17. uint to bytes32
  18. returns with name
  19. score voting
  20. Tests
    1. Async Tests
    2. Hooks

Library

Library:
- can't have state variables
- cannot inherit nor be inherited
- cannot receive Ether

images/795-1.png



See the:

using SafeMath for uint256;

accounts[msg.sender] is a uint256

images/795-2.png

https://solidity.readthedocs.io/en/v0.6.2/contracts.html#libraries