@ethersproject/bytes

Conversion between hex strings and byte arrays

This feature allows you to convert a hex string to a byte array and vice versa. The `arrayify` function converts a hex string to a Uint8Array, and the `hexlify` function converts a Uint8Array back to a hex string.

const { arrayify, hexlify } = require('@ethersproject/bytes');

const hexString = '0x123456';
const byteArray = arrayify(hexString);
console.log(byteArray); // Uint8Array [ 18, 52, 86 ]

const newHexString = hexlify(byteArray);
console.log(newHexString); // '0x123456'

Concatenation of byte arrays

This feature allows you to concatenate multiple byte arrays into a single byte array. The `concat` function takes an array of Uint8Arrays and returns a new Uint8Array that is the concatenation of all the input arrays.

const { concat } = require('@ethersproject/bytes');

const byteArray1 = new Uint8Array([1, 2, 3]);
const byteArray2 = new Uint8Array([4, 5, 6]);
const concatenatedArray = concat([byteArray1, byteArray2]);
console.log(concatenatedArray); // Uint8Array [ 1, 2, 3, 4, 5, 6 ]

Slicing byte arrays

This feature allows you to slice a byte array to get a subarray. The `slice` function takes a byte array and start and end indices, and returns a new byte array that is a subarray of the input array.

const { arrayify, hexlify, slice } = require('@ethersproject/bytes');

const hexString = '0x1234567890abcdef';
const byteArray = arrayify(hexString);
const slicedArray = slice(byteArray, 2, 6);
console.log(hexlify(slicedArray)); // '0x34567890'