Refs #454 -- Added SelfDestruct to general/build/smart-contracts/gas-optimization

docs/general/build/smart-contracts/gas-optimization/self-destruct.md

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+---
+displayed_sidebar: generalSidebar
+---
+
+# Using selfdestruct in Constructors
+
+In Solidity, optimizing gas usage is crucial for creating efficient smart contracts. One technique involves using the `selfdestruct` function within the constructor for contracts designed for one-time use. This approach can reduce gas costs by eliminating the contract from the blockchain once its purpose is fulfilled.
+
+Contracts are sometimes used to deploy several contracts in a single transaction. In cases where the only function of a contract is the code within the constructor, invoking `selfdestruct` at the end of the constructor can save gas. This is because `selfdestruct` removes the contract from the blockchain, thus reclaiming the storage and returning any remaining Cfx to a specified address.
+
+**Demo Code**
+
+To demonstrate this, the contract `SelfDestructExample` deploys another contract in its constructor and then self-destructs, optimizing gas usage.
+
+```solidity
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+contract DeployedContract {
+    uint256 public value;
+
+    constructor(uint256 _value) {
+        value = _value;
+    }
+}
+
+contract SelfDestructExample {
+    constructor(uint256 _value) {
+        // Deploy another contract
+        DeployedContract newContract = new DeployedContract(_value);
+
+        // Perform any required operations here...
+
+        // Self-destruct the contract to save gas
+        selfdestruct(payable(msg.sender));
+    }
+}
+```
+
+**Using `selfdestruct` in the Constructor**
+
+1. **Deploy another contract**: In the example, the `SelfDestructExample` contract deploys an instance of `DeployedContract` in the constructor.
+2. **Perform required operations**: Any operations that need to be done during the deployment can be performed.
+3. **Invoke `selfdestruct`**: Finally, the `selfdestruct` function is called to remove the contract from the blockchain, returning any remaining Cfx to the deployer's address.
+
+
+Using `selfdestruct` in the constructor for one-time-use contracts is a effective technique for gas optimization in Solidity, it helps in reducing gas costs and cleaning up the blockchain state.
+
+Recommendations for gas optimization:
+
+🌟 For contracts that only perform operations within the constructor and do not need to persist on the blockchain, use `selfdestruct` at the end of the constructor to save on gas costs and clean up the state.