Visibility scope
As we know, contracts comprise functions and state variables. So, when we declare functions and state variables, the next question that arises is who can access them. Visibility scope helps in determining who can view and access them. Solidity provides four levels of visibility modifiers. They vary in their usage and determine the level of visibility to their callers:
- Private: This is the most limited and constrained visibility modifier available in Solidity. Private means private to a contract. So, if a function is defined and marked as private within a contract, this function is only visible within the contract and it is not callable or visible from outside the contract, including child contracts.
- Internal: This is built on top of private scoping rules, and internal functions are visible within a contract and not from outside. However, it adds another rule that states that functions within any contract inheriting it can also call and have visibility...