Bytes

A dynamic array of byte values can be represented using the Bytes type, which represents raw bytes.

Using Bytes

The Bytes type can be integrated with your contract calls. Consider the following contract that can compare and return a Bytes:

contract;

use std::bytes::Bytes;

abi BytesTest {
    fn echo_bytes(value: Bytes) -> Bytes;
    fn bytes_comparison(value: Bytes) -> bool;
}

impl BytesTest for Contract {
    fn echo_bytes(value: Bytes) -> Bytes {
        value
    }

    fn bytes_comparison(value: Bytes) -> bool {
        let mut bytes = Bytes::new();

        bytes.push(40u8);
        bytes.push(41u8);
        bytes.push(42u8);

        value == bytes
    }
}

See code in context

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A Bytes array can be created using a native JavaScript array of numbers or Big Numbers, and sent to a Sway contract:

const bytes: Bytes = [40, 41, 42];

const { value } = await contract.functions.echo_bytes(bytes).get();

console.log('value', value);
// Uint8Array(3)[40, 41, 42]

See code in context