complete lesson 3

.gitignore

@@ -0,0 +1,3 @@
+node_modules
+.env
+package-lock.json

transfer.ts

@@ -0,0 +1,67 @@
+import {
+    Connection,
+    Transaction,
+    SystemProgram,
+    sendAndConfirmTransaction,
+    PublicKey,
+    SendTransactionError,
+    LAMPORTS_PER_SOL,
+  } from "@solana/web3.js";
+  import "dotenv/config";
+import { getEnabledCategories } from "trace_events";
+  const { getKeypairFromEnvironment, airdropIfRequired } = require("@solana-developers/helpers");
+
+  const suppliedToPubkey = process.argv[2] || null;
+
+  if (!suppliedToPubkey) {
+    console.log(`Please provide a public key to send to`);
+    process.exit(1);
+  }
+
+  const senderKeypair = getKeypairFromEnvironment("SECRET_KEY");
+
+  console.log(`suppliedToPubkey: ${suppliedToPubkey}`);
+
+  const toPubkey = new PublicKey(suppliedToPubkey);
+
+  const connection = new Connection("https://api.devnet.solana.com", "confirmed");
+
+
+    await airdropIfRequired(
+        connection,
+        toPubkey,
+        1 * LAMPORTS_PER_SOL,
+        0.5 * LAMPORTS_PER_SOL,
+    );
+
+  const bal = await connection.getBalance(senderKeypair.publicKey);
+
+  console.log(
+    `✅ Loaded our own keypair, the destination public key, and connected to Solana ${bal}`, 
+  );
+
+  const transaction = new Transaction();
+
+  const LAMPORTS_TO_SEND = 5000;
+
+  const sendSolInstruction = SystemProgram.transfer({
+    fromPubkey: senderKeypair.publicKey,
+    toPubkey,
+    lamports: LAMPORTS_TO_SEND,
+  });
+
+  transaction.add(sendSolInstruction);
+
+  try {
+    const signature = await sendAndConfirmTransaction(connection, transaction, [
+        senderKeypair,
+      ]);
+
+        console.log(
+            `💸 Finished! Sent ${LAMPORTS_TO_SEND} to the address ${toPubkey}. `,
+        );
+        console.log(`Transaction signature is ${signature}!`);
+  } catch (error) {
+    const logs = await error.getLogs(); // Використовуємо await для асинхронного методу
+    console.log(logs);
+    }