andrejrakic

Go (Golang) Standard Library Interfaces (Selected)

This is not an exhaustive list of all interfaces in Go's standard library. I only list those I think are important. Interfaces defined in frequently used packages (like io, fmt) are included. Interfaces that have significant importance are also included.

All of the following information is based on go version go1.8.3 darwin/amd64.

andrejrakic

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.19;

contract LogEmitter {
    event Log(address indexed msgSender);

    function emitLog() public {
        emit Log(msg.sender);
    }

andrejrakic

Go vs Rust vs Node.js

Command	Go	Rust	Node.js
Installation	go install	rustup	nvm/volta/n/fnm
Package Manager	go	cargo	npm/yarn/pnpm
Configuration	go.mod	Cargo.toml	package.json
Testing	go test	cargo test	jest/vitest/node:test
Building	go build	cargo build	Webpack/turbo

andrejrakic

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

//       x ----->
//      _______________
//  y  |____|____|_____
//     |____|____|_____
//     |____|____|_____
//     |____|____|_____

andrejrakic

// SPDX-License-Identifier: MIT
pragma solidity 0.8.0;

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

contract StorageBug is Ownable {

    function write(uint256 number) external onlyOwner {
        uint256[] storage arr;
        arr.push(number);

andrejrakic

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;


// Simple contract to swap two variables in Solidity
contract Swapper {
    uint8 public x = 1;
    uint8 public y = 2;
    
    function swap() public {

andrejrakic

👍 Examples of correct code ordering rule

All units are in order

pragma solidity ^0.7.0;

import "./some/library.sol";
import "./some/other-library.sol";

andrejrakic

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.10;

/*
EtherStore is a contract where you can deposit any amount and withdraw at most
1 Ether per week. This contract is vulnerable to re-entrancy attack.
Let's see why.

1. Deploy EtherStore
2. Deposit 1 Ether each from Account 1 (Alice) and Account 2 (Bob) into EtherStore

andrejrakic

pragma solidity 0.4.24;

import "https://github.com/smartcontractkit/chainlink/evm-contracts/src/v0.4/ChainlinkClient.sol";
import "https://github.com/smartcontractkit/chainlink/evm-contracts/src/v0.4/vendor/Ownable.sol";

contract ATestnetConsumer is ChainlinkClient, Ownable {
  uint256 constant private ORACLE_PAYMENT = 1 * LINK;

  uint256 public currentPrice;
  int256 public changeDay;

andrejrakic

pragma solidity ^0.5.1;

/**
 * @dev ERC-721 non-fungible token standard. 
 * See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md.
 */
interface ERC721
{

  /**