Function Modifiers
Explore how to implement and apply function modifiers in Solidity to manage pre-conditions and post-conditions in smart contracts. This lesson helps you create reusable validation logic, such as owner-only access and state checks, enhancing your ability to write secure and maintainable Ethereum contracts.
We'll cover the following...
A lot of code in our smart contracts is dedicated to checking pre-conditions, such as validating input arguments. In this lesson, we'll learn about function modifiers, a Solidity feature that enables us to implement and reuse pre- and post-condition implementation, or any code repeated across multiple functions.
Defining function modifiers
Using a function modifier, we can specify logic that should be executed before or after the body of a particular method. It's easier to explain how modifiers work through a specific example. Let’s say we have a smart contract, and this smart contract has an owner whose address is stored in a field of this contract:
The owner of the smart contract might have some extra privileges, like being able to remove the smart contract. We can enforce these ...