Address Lookup Tables

const web3 = require("@solana/web3.js");
 
// connect to a cluster and get the current `slot`
const connection = new web3.Connection(web3.clusterApiUrl("devnet"));
const slot = await connection.getSlot();
 
// Assumption:
// `payer` is a valid `Keypair` with enough SOL to pay for the execution
 
const [lookupTableInst, lookupTableAddress] =
  web3.AddressLookupTableProgram.createLookupTable({
    authority: payer.publicKey,
    payer: payer.publicKey,
    recentSlot: slot,
  });
 
console.log("lookup table address:", lookupTableAddress.toBase58());
 
// To create the Address Lookup Table onchain:
// send the `lookupTableInst` instruction in a transaction

// add addresses to the `lookupTableAddress` table via an `extend` instruction
const extendInstruction = web3.AddressLookupTableProgram.extendLookupTable({
  payer: payer.publicKey,
  authority: payer.publicKey,
  lookupTable: lookupTableAddress,
  addresses: [
    payer.publicKey,
    web3.SystemProgram.programId,
    // list more `publicKey` addresses here
  ],
});
 
// Send this `extendInstruction` in a transaction to the cluster
// to insert the listing of `addresses` into your lookup table with address `lookupTableAddress`

// define the `PublicKey` of the lookup table to fetch
const lookupTableAddress = new web3.PublicKey("");
 
// get the table from the cluster
const lookupTableAccount = (
  await connection.getAddressLookupTable(lookupTableAddress)
).value;
 
// `lookupTableAccount` will now be a `AddressLookupTableAccount` object
 
console.log("Table address from cluster:", lookupTableAccount.key.toBase58());

// loop through and parse all the addresses stored in the table
for (let i = 0; i < lookupTableAccount.state.addresses.length; i  ) {
  const address = lookupTableAccount.state.addresses[i];
  console.log(i, address.toBase58());
}

// Assumptions:
// - `arrayOfInstructions` has been created as an `array` of `TransactionInstruction`
// - we are using the `lookupTableAccount` obtained above
 
// construct a v0 compatible transaction `Message`
const messageV0 = new web3.TransactionMessage({
  payerKey: payer.publicKey,
  recentBlockhash: blockhash,
  instructions: arrayOfInstructions, // note this is an array of instructions
}).compileToV0Message([lookupTableAccount]);
 
// create a v0 transaction from the v0 message
const transactionV0 = new web3.VersionedTransaction(messageV0);
 
// sign the v0 transaction using the file system wallet we created named `payer`
transactionV0.sign([payer]);
 
// send and confirm the transaction
// (NOTE: There is NOT an array of Signers here; see the note below...)
const txid = await web3.sendAndConfirmTransaction(connection, transactionV0);
 
console.log(
  `Transaction: https://explorer.solana.com/tx/${txid}?cluster=devnet`,
);