Learn about the zeroPad utils method
Introduction
The zeroPad method is used to pad a hex string into a byte array with leading zeros so that its length is 64 characters.
Usage
This method should be used when you want to pad a hex string into a byte array with leading zeros so that its length is 64 characters. For example, you can use this method to pad the hex string '0x1234' into:
Uint8Array(64) [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 18, 52
]
Here's a simple code example to demonstrate how to use this method:
const { Utils } = require("alchemy-sdk");
let hexString = '0x1234';
let zeroPaddedHexByteArray = Utils.zeroPad(hexString, 64);
console.log(zeroPaddedHexByteArray);
/*
Output:
Uint8Array(64) [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 18, 52
]
*/