Blockchain Developer Certification Practice

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Prepare for the Blockchain Developer Certification. Master blockchain concepts with flashcards and multiple choice questions. Explanation-based learning for your success!

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What does the 'payable' function type in Solidity allow?

Only ether withdrawals
Modification of storage variables
Receiving ether when the function is called
Reading contract data without changing it

The correct answer is: Receiving ether when the function is called

The 'payable' function type in Solidity is specifically designed to allow a function to receive ether when it is called. This is crucial for the operation of smart contracts that need to receive funds as part of their transaction logic. When a function is marked as 'payable', it enables the contract to accept and handle incoming ether, allowing users to interact with the contract by sending payments directly to it. For instance, a common use case for a payable function is in a crowdfunding contract where users can send ether to contribute to a project. The function then processes the incoming ether within the contract's logic, which may include updating balances, distributing tokens, or triggering other functionalities based on the contribution. Receiving ether is a critical feature for many decentralized applications (dApps) on the Ethereum blockchain, making the 'payable' designation an essential part of Solidity programming for any functionality involving monetary transactions.