Notes

• A constructor is an optional function that is executed upon contract creation.
• Here are examples of how to pass arguments to constructors:

Code

solidity
Constructor.sol
Copy
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

// Base contract X
contract X {
   string public name;

   constructor(string memory _name) {
       name = _name;
   }
}

// Base contract Y
contract Y {
   string public text;

   constructor(string memory _text) {
       text = _text;
   }
}

// There are 2 ways to initialize parent contract with parameters.

// Pass the parameters here in the inheritance list.
contract B is X("Input to X"), Y("Input to Y") {

}

contract C is X, Y {
   // Pass the parameters here in the constructor,
   // similar to function modifiers.
   constructor(string memory _name, string memory _text) X(_name) Y(_text) {}
}

// Parent constructors are always called in the order of inheritance
// regardless of the order of parent contracts listed in the
// constructor of the child contract.

// Order of constructors called:
// 1. X
// 2. Y
// 3. D
contract D is X, Y {
   constructor() X("X was called") Y("Y was called") {}
}

// Order of constructors called:
// 1. X
// 2. Y
// 3. E
contract E is X, Y {
   constructor() Y("Y was called") X("X was called") {}
}