changes : 1,2,3

examples/1_accounts.js

@@ -1,14 +1,21 @@
 const { ethers } = require("ethers");
 
-const INFURA_ID = ''
-const provider = new ethers.providers.JsonRpcProvider(`https://mainnet.infura.io/v3/${INFURA_ID}`)
+// const INFURA_ID = "3eaee57df35f4e3e9f41c609cf6d774b";
 
-const address = '0x73BCEb1Cd57C711feaC4224D062b0F6ff338501e'
+const provider = new ethers.providers.JsonRpcProvider(
+  'https://mainnet.infura.io/v3/3eaee57df35f4e3e9f41c609cf6d774b'
+);
+
+const address = "0x73BCEb1Cd57C711feaC4224D062b0F6ff338501e";
 
 const main = async () => {
-    const balance = await provider.getBalance(address)
-    console.log(`\nETH Balance of ${address} --> ${ethers.utils.formatEther(balance)} ETH\n`)
-}
+  const balance = await provider.getBalance(address);
 
-main()
+  console.log(
+    `\n ETH Balance of ${address} --> ${ethers.utils.formatEther(
+      balance
+    )} ETH\n`
+  );
+};
 
+main();

examples/2_read_smart_contracts.js

@@ -0,0 +1,37 @@
+const ethers = require("ethers");
+
+const provider = new ethers.providers.JsonRpcProvider(
+  "https://mainnet.infura.io/v3/3eaee57df35f4e3e9f41c609cf6d774b"
+);
+
+const ERC20_ABI = [
+  "function name() view returns (string)",
+  "function symbol() view returns (string)",
+  "function totalSupply() view returns (uint256)",
+  "function balanceOf(address) view returns (uint)",
+];
+
+const address = "0x6B175474E89094C44Da98b954EedeAC495271d0F"; // DAI Contract
+
+//creating an instance of the contract
+
+const contract = new ethers.Contract(address, ERC20_ABI, provider);
+
+const main = async () => {
+  const name = contract.name();
+  const symbol = contract.symbol();
+  const totalSupply = contract.totalSupply();
+
+  console.log(`\n Reading from ${address}\n`);
+  console.log(`Name : ${name}`);
+  console.log(`Symbol : ${symbol}`);
+  console.log(`TotalSupply : ${totalSupply}`);
+
+  const balance = await contract.balanceOf(
+    "0x6c6Bc977E13Df9b0de53b251522280BB72383700"
+  );
+
+  console.log(`Balance returned: ${balance}`);
+  console.log(`Balance Formatted: ${ethers.utils.formatEther(balance)}`); // converting DAI to Ethers format
+};
+

examples/3_send_signed_transaction.js

@@ -1,34 +1,53 @@
-const { ethers } = require("ethers");
+const ethers = require("ethers");
 
-const INFURA_ID = ''
-const provider = new ethers.providers.JsonRpcProvider(`https://kovan.infura.io/v3/${INFURA_ID}`)
+const provider = new ethers.providers.JsonRpcProvider(
+  "https://sepolia.infura.io/v3/3eaee57df35f4e3e9f41c609cf6d774b"
+);
 
-const account1 = '' // Your account address 1
-const account2 = '' // Your account address 2
+const account1 = "0xecCb2450889B3f68C0cd234FE05420Ef87b0a027"; //sender
+const account2 = "0xD43cA3765c530D697fa2ECe322d2d43d993d0651"; //recepient
+const privateKey1 =
+  "25202a70c90a9d9b1f20d20066b6b67ec95ce231b09f11ef109406a839fc9794"; //sender private key
 
-const privateKey1 = '' // Private key of account 1
-const wallet = new ethers.Wallet(privateKey1, provider)
+//creating a wallet of account 1
+const wallet = new ethers.Wallet(privateKey1, provider);
 
 const main = async () => {
-    const senderBalanceBefore = await provider.getBalance(account1)
-    const recieverBalanceBefore = await provider.getBalance(account2)
-
-    console.log(`\nSender balance before: ${ethers.utils.formatEther(senderBalanceBefore)}`)
-    console.log(`reciever balance before: ${ethers.utils.formatEther(recieverBalanceBefore)}\n`)
-
-    const tx = await wallet.sendTransaction({
-        to: account2,
-        value: ethers.utils.parseEther("0.025")
-    })
-
-    await tx.wait()
-    console.log(tx)
-
-    const senderBalanceAfter = await provider.getBalance(account1)
-    const recieverBalanceAfter = await provider.getBalance(account2)
-
-    console.log(`\nSender balance after: ${ethers.utils.formatEther(senderBalanceAfter)}`)
-    console.log(`reciever balance after: ${ethers.utils.formatEther(recieverBalanceAfter)}\n`)
-}
-
-main()
+  const senderBalanceBefore = await provider.getBalance(account1);
+  const receiverBalanceBefore = await provider.getBalance(account2);
+  // Logging the balances before the transaction in a user-friendly format.
+  console.log(
+    `\n Sender Balance Before: ${ethers.utils.formatEther(senderBalanceBefore)}`
+  );
+  console.log(
+    `\n Receiver Balance Before: ${ethers.utils.formatEther(
+      receiverBalanceBefore
+    )}`
+  );
+
+  //send ether
+  const tx = await wallet.sendTransaction({
+    to: account2,
+    value: ethers.utils.parseEther("0.025"), //0.025 ether to WEI
+  });
+
+  //Wait for transaction to be mined
+  await tx.wait();
+  console.log(tx);
+
+  // Getting the balances of the sender and receiver accounts after the transaction.
+  const senderBalanceAfter = await provider.getBalance(account1);
+  const receiverBalanceAfter = await provider.getBalance(account2);
+
+  // Logging the balances after the transaction in a user-friendly format
+  console.log(
+    `\n Sender Balance After: ${ethers.utils.formatEther(senderBalanceAfter)}`
+  );
+  console.log(
+    `\n Receiver Balance After: ${ethers.utils.formatEther(
+      receiverBalanceAfter
+    )}`
+  );
+};
+
+main();

examples/4_write_contract.js

@@ -1,40 +1,46 @@
-const { ethers } = require("ethers");
+const { ethers, Wallet } = require("ethers");
 
-const INFURA_ID = ''
-const provider = new ethers.providers.JsonRpcProvider(`https://kovan.infura.io/v3/${INFURA_ID}`)
+const rpovider = new ethers.JsonRpcProvider("");
 
-const account1 = '' // Your account address 1
-const account2 = '' // Your account address 2
+// Defining two Ethereum accounts and their private keys.
+const account1 = ''; // Your account address 1
+const account2 = ''; // Your account address 2
 
-const privateKey1 = '' // Private key of account 1
-const wallet = new ethers.Wallet(privateKey1, provider)
+const privateKey1 = ""; // Private key of account 1
 
+// Creating a wallet using the private key and the previously defined provider.
+const wallet = new ethers.Wallet(privateKey1, provider);
+
+// Defining an ERC20 token's ABI (Application Binary Interface), specifying functions the contract supports.
 const ERC20_ABI = [
-    "function balanceOf(address) view returns (uint)",
-    "function transfer(address to, uint amount) returns (bool)",
+  "function balanceOf(address) view returns (uint)",
+  "function transfer(address to, uint amount) returns (bool)",
 ];
 
-const address = ''
-const contract = new ethers.Contract(address, ERC20_ABI, provider)
+//fining the address of the ERC20 token contract.
+const address = '';
+
+// Creating an instance of the ERC20 token contract using the ABI, address, and provider.
+const contract = new ethers.Contract(address, ERC20_ABI, provider);
 
 const main = async () => {
-    const balance = await contract.balanceOf(account1)
+  const balance = await contract.balanceOf(account1);
 
-    console.log(`\nReading from ${address}\n`)
-    console.log(`Balance of sender: ${balance}\n`)
+  console.log(`\n Reading from ${address}\n`);
+  console.log(`Balance of sender: ${balance}`);
 
-    const contractWithWallet = contract.connect(wallet)
+  const contractWithWallet = await contract.connect(Wallet);
 
-    const tx = await contractWithWallet.transfer(account2, balance)
-    await tx.wait()
+  const tx = await contractWithWallet.transfer(account2, balance);
+  await tx.wait(); //contract mining
 
-    console.log(tx)
+  console.log(tx);
 
-    const balanceOfSender = await contract.balanceOf(account1)
-    const balanceOfReciever = await contract.balanceOf(account2)
+  const balanceOfSender = await contract.balanceOf(account1);
+  const balanceOfReceiver = await contract.balanceOf(account2);
 
-    console.log(`\nBalance of sender: ${balanceOfSender}`)
-    console.log(`Balance of reciever: ${balanceOfReciever}\n`)
-}
+  console.log(`\nBalance of sender: ${balanceOfSender}`);
+  console.log(`Balance of receiver: ${balanceOfReceiver}\n`);
+};
 
-main()
+main();

examples/5_contract_event_stream.js

@@ -22,4 +22,4 @@ const main = async () => {
     console.log(transferEvents)
 }
 
-main()
+main();