Solidity Bad Practices: Missing Constructor

The contract does not declare a constructor.

When using Solidity compiler versions prior to version 0.5.0, developers can define a constructor by creating a function with the same name as the containing contract. Constructors in general are reserved for sensitive functionality and meant to be run only at contract creation. If the constructor has a typo such that the name does not match the contract name, then the sensitive functionality in the constructor is exposed.

Example 1: The following code uses a Solidity compiler version earlier than 0.5.0 and tries to declare a constructor with a name that does not exactly match the contract name. In this example, the case of the contract name and the constructor name do not match (Missing vs missing).

pragma solidity 0.4.20;

contract Missing {
    address private owner;
    function missing() public {
        owner = msg.sender;
    }
}