Ethereum: What is the function signature equivalent of a `bytes` object in Solidity, in Vyper?

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Ethereum: What is the equivalent function signature of the bytes object in Solidity, in Vyper?

In this article, we will explore the equivalent function signature for the bytes object in two popular blockchain platforms: Ethereum (Solidity) and Vyper.

What is a bytes object in Solidity?

A bytes object in Solidity represents an array of bytes. In the context of smart contracts, it can be used to store data such as images, videos, or other binary data.

In Solidity, a bytes object can be defined using the following syntax:

bytes of memory data;

This creates an empty bytes object that can be used to store any kind of byte array.

Convert a bytes object in Vyper

Now, let’s convert this equivalent function signature to its Vyper counterpart. In Vyper, we use the « Bytes » type to represent a byte array.

functionRandomness(
uint256 randomness,
Bytes calldata dataWithRound
) returns (bool);

The following has changed:

• We have replaced Solidity’s Bytes object with the Bytes Vyper type.

• We have used the « calldata » keyword to indicate that the function has a variable number of arguments that are stored in memory. In this case, we use « dataWithRound », which is a byte array.

• The return type remains « bool », as in Solidity.

Usage example

Here is an example of using the Vyper equivalent:

const uint256 randomness = 0x1234567890abcdef;
const bytes dataWithRound = b"Hello world!";
functionRandomness(
uint256 randomness,
Bytes calldata dataWithRound
) return (bool) {
// Data Processing
return true;
}

In this example, we define a variable « randomness » of « uint256 » and a byte array « dataWithRound ». We will then use these variables in the signature of the equivalent Vyper function.

Note that Vyper supports more advanced types and syntax than Solidity. So be aware of other differences between the two platforms.

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