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‎Tutorial 1-Getting balance of accounts.js‎

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const Web3 = require("web3");
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//console.log(Web3);
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const rpcUrl = "https://ropsten.infura.io/v3/c89f216154d84b83bb9344a7d0a91108";
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let web3 = new Web3(rpcUrl);
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//console.log("new web 3 instance " + web);
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let account1 = "0xC0847D13b14E9dc83FCa69fD17f066d873035bEd";
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let account2 = "0x6556e03faE63AB57f1f9b11b448755798AeDAd06";
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//console.log(web.eth.getBalance(address));
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web3.eth.getBalance(account1, (err, _balance) => {
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if (err) {
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console.log("Error Has occured");
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} else {
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console.log("Account# 1 balance ", web3.utils.fromWei(_balance, "ether"));
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}
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});
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web3.eth.getBalance(account2, (err, _balance) => {
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if (err) {
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console.log("Error Has occured");
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} else {
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console.log("Account# 2 balance ", web3.utils.fromWei(_balance, "ether"));
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}
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});

‎Tutorial2 -Calling Return Functions of Smart Contract.js‎

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const Web3 = require("web3");
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//console.log(Web3);
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const rpcUrl = "https://ropsten.infura.io/v3/c89f216154d84b83bb9344a7d0a91108";
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let web = new Web3(rpcUrl);
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//console.log("new web 3 instance " + web);
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let abi = [
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{
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inputs: [
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{
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internalType: "uint256",
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name: "_age",
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type: "uint256"
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}
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],
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name: "setAge",
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outputs: [],
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stateMutability: "nonpayable",
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type: "function"
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},
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{
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inputs: [],
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name: "getAge",
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outputs: [
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{
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internalType: "uint256",
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name: "",
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type: "uint256"
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}
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],
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stateMutability: "view",
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type: "function"
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}
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];
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const address1 = "0x1c091a6fa3ed1d51285d0a9df5b7c2004ee33c7a";
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const contract = new web.eth.Contract(abi, address1);
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//console.log(contract.methods.setAge + " This is my Contract");
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contract.methods.getAge().call(function(err, result) {
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console.log("This is my age ", result);
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});

‎Tutorial3 -Transfering ether between Accounts.js‎

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var Tx = require("ethereumjs-tx").Transaction;
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const Web3 = require("web3");
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const web3 = new Web3(
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"https://ropsten.infura.io/v3/c89f216154d84b83bb9344a7d0a91108"
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);
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const account1 = "0xC0847D13b14E9dc83FCa69fD17f066d873035bEd";
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const account2 = "0x6556e03faE63AB57f1f9b11b448755798AeDAd06";
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const Private_Key_2 = Buffer.from(
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"765143AE9E78BB3E4FFB365EC0B68517EC196EAF2BF8E77B79226CDFC1B55B22",
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"hex"
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);
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const Private_Key_1 = Buffer.from(
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"01EF34E359D08E81A228935EA51E4A56477ACD6E8BD6E12405F85F684247A48D",
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"hex"
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);
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//console.log(web3.eth.accounts.create());
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/*
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web3.eth.getBalance(account1, (err, _balance) => {
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if (err) {
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console.log("Error Has occured");
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} else {
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console.log("Account# 1 balance ", web3.utils.fromWei(_balance, "ether"));
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}
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});
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web3.eth.getBalance(account2, (err, _balance) => {
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if (err) {
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console.log("Error Has occured");
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} else {
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console.log("Account# 2 balance ", web3.utils.fromWei(_balance, "ether"));
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}
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});
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*/
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web3.eth.getTransactionCount(account1, (err, _count) => {
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//build the transaction
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const txObject = {
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nonce: web3.utils.toHex(_count),
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to: account2,
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value: web3.utils.toHex(web3.utils.toWei("1", "ether")),
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gasLimit: web3.utils.toHex(21000),
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gasPrice: web3.utils.toHex(web3.utils.toWei("10", "gwei"))
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};
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//console.log(txObject);
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//sign the transaction
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const tx = new Tx(txObject, { chain: "ropsten" });
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tx.sign(Private_Key_1);
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const serialTransaction = tx.serialize();
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const raw = "0x" + serialTransaction.toString("hex");
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//brodcast the transaction
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web3.eth.sendSignedTransaction(raw, (err, txHash) => {
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if (err) {
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console.log(err.message);
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} else {
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console.log("txHash:", txHash);
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}
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});
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});

‎Tutorial4 -Deploying Smart Contracts.js‎

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var Tx = require("ethereumjs-tx").Transaction;
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const Web3 = require("web3");
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const web3 = new Web3(
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"https://ropsten.infura.io/v3/c89f216154d84b83bb9344a7d0a91108"
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);
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const account1 = "0x6556e03faE63AB57f1f9b11b448755798AeDAd06";
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const privateKey1 = Buffer.from(
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"765143AE9E78BB3E4FFB365EC0B68517EC196EAF2BF8E77B79226CDFC1B55B22",
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"hex"
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);
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// Deploy the contract
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web3.eth.getTransactionCount(account1, (err, txCount) => {
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const data =
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"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";
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const dataBuffer = Buffer.from(data, "hex");
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const txObject = {
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nonce: web3.utils.toHex(txCount),
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gasLimit: web3.utils.toHex(1000000), // Raise the gas limit to a much higher amount
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gasPrice: web3.utils.toHex(web3.utils.toWei("10", "gwei")),
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data: data
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};
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const tx = new Tx(txObject, { chain: "ropsten" });
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tx.sign(privateKey1);
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const serializedTx = tx.serialize();
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const raw = "0x" + serializedTx.toString("hex");
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web3.eth.sendSignedTransaction(raw, (err, txHash) => {
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console.log("err:", err, "txHash:", txHash);
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// Use this txHash to find the contract on Etherscan!
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});
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});

‎Tutorial5 -Executing Smart Contract Functions.js‎

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var Tx = require("ethereumjs-tx").Transaction;
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const Web3 = require("web3");
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const web3 = new Web3(
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"https://ropsten.infura.io/v3/c89f216154d84b83bb9344a7d0a91108"
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);
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const account1 = "0xC0847D13b14E9dc83FCa69fD17f066d873035bEd";
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let abi = [
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{
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inputs: [],
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name: "doSomeWork",
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outputs: [
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{
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internalType: "string",
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name: "",
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type: "string"
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}
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],
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stateMutability: "nonpayable",
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type: "function"
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},
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{
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anonymous: false,
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inputs: [
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{
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indexed: false,
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internalType: "string",
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name: "",
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type: "string"
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}
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],
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name: "logString",
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type: "event"
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},
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{
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inputs: [
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{
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internalType: "uint256",
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name: "_age",
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type: "uint256"
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}
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],
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name: "setAge",
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outputs: [],
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stateMutability: "nonpayable",
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type: "function"
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},
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{
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inputs: [],
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name: "getAge",
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outputs: [
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{
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internalType: "uint256",
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name: "",
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type: "uint256"
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}
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],
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stateMutability: "view",
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type: "function"
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},
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{
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inputs: [],
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name: "getString",
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outputs: [
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{
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internalType: "string",
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name: "",
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type: "string"
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}
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],
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stateMutability: "view",
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type: "function"
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}
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];
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const account2 = "0x1c091a6fa3ed1d51285d0a9df5b7c2004ee33c7a";
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const Private_Key_1 = Buffer.from(
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"01EF34E359D08E81A228935EA51E4A56477ACD6E8BD6E12405F85F684247A48D",
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"hex"
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);
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const contract = new web3.eth.Contract(abi, account2);
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data = contract.methods.setAge(12).encodeABI();
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//console.log(web3.eth.accounts.create());
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/*
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web3.eth.getBalance(account1, (err, _balance) => {
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if (err) {
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console.log("Error Has occured");
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} else {
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console.log("Account# 1 balance ", web3.utils.fromWei(_balance, "ether"));
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}
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});
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web3.eth.getBalance(account2, (err, _balance) => {
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if (err) {
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console.log("Error Has occured");
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} else {
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console.log("Account# 2 balance ", web3.utils.fromWei(_balance, "ether"));
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}
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});
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*/
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web3.eth.getTransactionCount(account1, (err, _count) => {
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//build the transaction
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const txObject = {
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nonce: web3.utils.toHex(_count),
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to: account2,
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data: data,
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gasLimit: web3.utils.toHex(800000),
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gasPrice: web3.utils.toHex(web3.utils.toWei("10", "gwei"))
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};
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//console.log(txObject);
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//sign the transaction
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const tx = new Tx(txObject, { chain: "ropsten" });
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tx.sign(Private_Key_1);
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const serialTransaction = tx.serialize();
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const raw = "0x" + serialTransaction.toString("hex");
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//brodcast the transaction
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web3.eth.sendSignedTransaction(raw, (err, txHash) => {
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if (err) {
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console.log(err.message);
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} else {
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console.log("txHash:", txHash);
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}
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});
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});
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contract.methods.getAge().call(function(err, result) {
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if (err) {
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console.log(err.message);
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}
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console.log("This is my age ", result);
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});

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