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

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Ethereum: What is the equivalent of the bytes object function signature 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?

Thebytesobject 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, abytesobject can be defined using the following syntax:

bytes of memory data;

This creates an empty bytesobject that can be used to store any type of byte array.

Convertingbytesobject to Vyper

Now, let's convert this equivalent function signature to its Vyper counterpart. In Vyper, we use theBytestype to represent an array of bytes.

function fillRandomness(

    uint256 randomness,

    Bytes calls data dataWithRound

) return (bool);

• We replaced Solidity's bytes’ object with Vyper’s Bytes' type.

• We used thecalldatakeyword to specify that the function take a variable amount of arguments that are stored in memory. In this case we usedataWithRound, which is an array of bytes.

• The return type remainsbool’, as it was in Solidity.

Example of use

Here’s an example use case for the Vyper equivalent:

const uint256 randomness = 0x1234567890abcdef;

const bytes dataWithRound = b"Hello world!";

function fillRandomness(

    uint256 randomness,

    Bytes calls data dataWithRound

) return (bool) {

    // Data processing

    return true;

}

In this example we define a uint256 variable randomness and a byte array dataWithRound. We then use those variables in the signature of Vyper’s equivalent function.

Note that Vyper supports more advanced types and syntax than Solidity, so keep an eye out for other differences between the two platforms.

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