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Creating and Editing Lookup Tables in Web3.js 2.0.0: A Step-by-Step Guide
As web3.js continues to evolve with new releases, it is not uncommon for developers to encounter changes in the underlying protocols and APIs. In this article, we will learn how to create and edit lookup tables (also known as AddressLookupTableProgram) in the new web3.js version 2.0.0.
What is a lookup table?
A lookup table is an interface for querying addresses or data on a blockchain. It allows you to perform searches based on specific criteria, such as address, signature, or data. In the context of web3.js, lookup tables are used for various applications such as decentralized finance (DeFi), non-fungible tokens (NFTs), etc.
The old way: using AddressLookupTableProgram
Prior to version 2.0.0, you could create and modify lookup tables using the old AddressLookupTableProgram API:
const lookupTable = new web3.eth.AddressLookupTableProgram({
// lookup table configuration
});
// Create a function to query the table
function query() {
return lookupTable.query(address);
}
// Use the function to look up an address
query().then((result) => {
console.log(result);
});
However, this approach had some limitations. The AddressLookupTableProgram API was not designed for large-scale use cases or complex queries.
The new method: using lookupTables.createAndEdit
With the release of web3.js 2.0.0, a new interface has been introduced to create and edit lookup tables: lookupTables.createAndEdit. This method provides more flexibility and scalability compared to the old API:
const lookupTable = await lookupTables.createAndEdit({
// configuration of the lookup table (e.g. list of addresses)
addresses,
});
// Create a function to query the table
async function query() {
const result = await lookupTable.query();
return result;
}
// Use the function to look up an address
query().then((result) => {
console.log(result);
});
The createAndEdit method is responsible for creating and managing multiple tables, including setting default values for a table or merging existing tables.
How lookup tables work
To understand how lookup tables work in the new web3.js, let's take a look at their inner workings. Here's a high-level overview:
- Table creation: When you create a new table using
lookupTables.createAndEdit, web3.js generates an index for the table based on its configuration.
- Data indexing: Data is indexed by storing it in a separate storage system (e.g., JSON or a database).
- Data querying
: When a query is executed, web3.js searches through the index data to retrieve the relevant records.
Conclusion
In this article, we explored how to create and edit lookup tables in the new web3.js version 2.0.0 using the lookupTables.createAndEdit method. By taking advantage of this improved interface, you can now perform more complex queries and easily manage large datasets.
Be sure to check out the [official web3.js documentation]( for more information on lookup tables and related topics.
Sample Code
Here is an example of using lookupTables.createAndEdit to create a new table:
const lookupTable = await lookupTables.createAndEdit({
addresses: [
'0x...',
'0x...',
],
});
// Create a function to query the table
async function query() {
const result = wait lookupTable.query();
return result;
}
// Use the function to lookup an address
query().then((result) => {
console.log(result);
});
This code creates a new lookup table with two addresses and shows how to query it using the createAndEdit method.
