Blockchain Developer Certification Practice

What differentiates address payable from a regular address in Solidity?

1. Address payable can store funds

2. Address can send Ether

3. Address payable can receive funds

4. Address can never hold a payee

The correct answer is: Address payable can store funds

The primary distinction between `address payable` and a regular `address` in Solidity lies in the ability of an `address payable` to manage and interact with Ether. Specifically, an `address payable` can not only send Ether but also receive it, making it suitable for accounts that are intended to manage financial transactions within smart contracts. When a contract or account is defined as `address payable`, it gains additional functionality related to handling Ether. This includes the capability to directly receive Ether transfers through functions like `.transfer()` and `.send()`, which are not available to a regular `address`. A regular `address`, on the other hand, lacks this inherent capability to receive Ether directly, hence limiting its use in transactions that involve cryptocurrency. Understanding this capability is crucial for developers, especially when designing smart contracts that require the management of funds. The additional functionalities associated with `address payable` enable safer and more versatile contract implementations, particularly when income or payments are involved.