-
Receive function in Solidity
Receive function is used to get ether on contract call. It must be external with payable visibility. it only call from other contract with call method and send, transfer throw an error.
-
Fallback function in Solidity
Fallback function execute when another contract call it with unknown function. Below is basic syntax for fallback function. There are two fallback functions, first one is simple and second is payable who can receive ethers. Three ways to call a method from another contract: Example of fallback function: when we transfer ether using fallback then…
-
Self Destruct method of Smart Contract in Solidity
Here is the code example how can we destruct a contract. For destruction we have to set the payable address in selfdestruct method where all ethers of contract can be transferred. After destruct a contract all state variables become null, 0 or false, also we can’t update any state variable. e.g.
-
Ownerable Pattern in Solidity
In this pattern we can define the owner of a contract, which restrict or control the protected methods, also can transfer his ownership to another.
-
Speed Dump Pattern in Solidity
Delay in withdraw can save smart contract from malicious activity. Here is the example how you can apply a delay in smart contract.
-
Circuit Break Pattern in Solidity
In the live contract there are many chances we find an type of error and we have to stop smart contract to handle malicious activity. here is the sample of Circuit Break Pattern.
-
State Machine Pattern in Solidity
During developing a smart contract sometime we need to manage the different stages and execute and restrict method according to that state/stage of the smart contract.
-
Owner Based Restriction in solidity
Authentication is very important in any project to control and give limited access to users for this purpose, in solidity we get this functionality with this pattern.
-
Cost Based Restriction in Smart Contract Solidity
Here we apply cost based restriction, in which sender can’t able to send ethers less than cost defined my contract Owner.
-
Time Based Restriction in Smart Contract Solidity
Sometime we need to apply time base restrictions for special offer or ICO. Below, is the example for timebase restriction.