openzeppelin-solidity
SoliditySamples
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openzeppelin-solidity | SoliditySamples | |
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openzeppelin-solidity
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Attack Vectors in Solidity #6:Unexpected Ether( Incorrect Use of this.balance)
pragma solidity ^0.5.0; import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/math/SafeMath.sol"; contract MyContract { using SafeMath for uint256; function deposit() public payable { // code to deposit ether } function withdraw(uint256 _amount) public { require(this.balance.sub(_amount) >= 0, "Insufficient funds"); // code to withdraw ether } }
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How to check if tokenholder is holding 2 different tokens at the same time before an event is triggered?
The basic structure could be done as follows using OZ ERC20 interface https://github.com/OpenZeppelin/openzeppelin-solidity/blob/master/contracts/token/ERC20/IERC20.sol
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Is this why shib price keeps going down?
return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a, "SafeMath: subtraction overflow"); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0, "SafeMath: division by zero"); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b != 0, "SafeMath: modulo by zero"); return a % b; }
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can someone tell me what this contract wants?
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
SoliditySamples
- New to ETH need Guidance
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A Few Ethereum Questions
Easy, but Ethereum cant trigger tasks on a schedule so something external is needed. You can probably get started here https://github.com/ajlopez/SoliditySamples
- When should i move on Solidty?
- WHERE DO I BEGIN LEARNING?
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[COMPLETE NOOB HERE] Wanted to create an ERC20 token. Any no code tool you would recommend? PS, I know a token is only on one chain, but I've seen tokens on both ETH & BSC chains. I think its called wrapping. How does it work? How is price kept same? Any no code tool you would recommend? Thank you!
You might also find something useful here https://github.com/ajlopez/SoliditySamples
- Best way to get into Ethereum based development from a supply chain perspective?
- Daily General Discussion - December 9, 2021
- Making an βERC20β token but comes out as BEP20 please assist
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Devs who use oracle?
Maybe you can find a code example here.
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Why Solana over Ethereum? Developer looking to get into blockchain development
Heres a big list of Ethereum projects you can have a look at https://github.com/ajlopez/SoliditySamples
What are some alternatives?
RegEx-DoS - :cop: :punch: RegEx Denial of Service (ReDos) Scanner
l2beat - L2BEAT is an analytics and research website about Ethereum layer two (L2) scaling solutions.
openzeppelin-contracts - OpenZeppelin Contracts is a library for secure smart contract development.
scaffold-eth-challenges - Scaffold-Eth π Challenges repository
echidna - Ethereum smart contract fuzzer
zksync - zkSync: trustless scaling and privacy engine for Ethereum
eattheblocks - Source code for Eat The Blocks, a screencast for Ethereum Dapp Developers
airdrop-addresses
yulp - β A low-level, highly efficient extension to Yul, an intermediate language for the Ethereum Virtual Machine.
starkex-contracts
bytecode-verifier - Compile Solidity source code and verify its bytecode matches the blockchain