Ethereum : Master Web3js Library

Name: Ethereum : Master Web3js Library
Rating: 3.9 (285 reviews)

Working with web3js on following topic : account, blockchain, smart contract and transaction

Created byTan Pham

Last updated 9/2018

English

What you'll learn

Understand how to work with Ethereum account
Understand how to work with Ethereum blockchain
Understand how to work with Ethereum smart contract
Understand how to work with Ethereum transaction

Course content

5 sections • 22 lectures • 1h 45m total length

My Another Course, Search For Title "Ethereum : Dapp Development Bootcamp"1:48
Explore the architecture of decentralized applications, code solidity smart contracts, build a ui, and deploy on a network using a client with ipfs for decentralization.
Web3js the Big Picture1:38
Explore the big picture of this Ethereum based application, including the peer-to-peer network, transaction network, and smart contracts, and how the front end uses web3js to read and update state.
Installation and Tools1:28
Download and install the required tools for this Ethereum course, including npm and web3, to prepare the development environment and start the hands-on lessons.
Source Code for All Lecture0:02

Create Web3 Object6:29
Create a Web3 object by requiring the Web3 library and instantiating a new Web3 provider, then connect to local or remote networks (Ganache, Infura) via IPC, HTTP, or HTTPS.
Create New Account6:29
Create a new Ethereum account with Web3.js by requiring the library, initializing a Web3.js instance with a provider, and connecting to Ganache or Infura for local or test networks.
Get Account Balance4:12
Learn how to retrieve an Ethereum account balance using the Web3.js library, selecting an address, invoking getBalance with a callback, and handling results and errors.
Wallet4:12
Create a wallet, add new accounts, and manage private keys in a Web3js workflow. Learn how accounts are indexed from zero and how to access wallet details.

Introduction1:15
Introduce Ethereum blockchain concepts with the Web3js library, showing real-time transactions and new blocks, block inspection, owner information, and subscribing to pending transactions.
Block Inspection9:46
Master the web3js block inspection by fetching current and specific block details, including transactions, using flexible input (numbers or strings) to uncover detailed block information.
Subscribe Block Headers3:10
subscribe to new block headers using a web socket connection, print and process each incoming block data via a callback, and handle errors during subscription.
Subscribe Pending Transactions7:47
subscribe to pending transactions in Ethereum using the Web3.js library, monitor status from pending to confirmed, and handle callbacks to track transaction hash and value conversions to ether.
Subscribe Logs Part 14:53
Learn to subscribe to blockchain events using web3.js, define topics, handle event data with callbacks, and listen to crypto kitties contract events on the Ethereum network.
Subscribe Logs Part 24:27
Learn how to subscribe to contract logs with web3js, filter by topics, retrieve hashes, and observe real-time activity in the Ethereum environment.

Create Contract Object3:30
Learn to create a web3.js contract object by supplying the contract ABI and address, then interact with the contract and read its data.
Method Call5:04
Learn to call read-only contract methods such as name, balance, and total supply using web3js. Practice executing state-changing functions like transfer, and understand read calls versus transactions in Ethereum contracts.
Subscribe Events4:02
Learn to subscribe to contract events with web3.js by using fromBlock and toBlock to define a block range, and handle transfer events from the crypto kitty contract.

Transaction Overview2:25
Explore the three kinds of Ethereum transactions: simple value transfers between users, contract data calls, and deploying new smart contracts to the network.
Transaction to Send Ether Part 16:12
Install and set up the web3.js environment, define a transaction object, and obtain test ether. Check balances, then prepare and send ether from one account to another.
Transaction to Send Ether Part 213:00
Learn to construct, sign, and broadcast an ether transfer using web3.js, covering nonce, gas, gas price, value conversion, and raw transaction serialization.
Transaction to Deploy Contract9:15
Deploy a smart contract on Ethereum using Web3.js, a voting contract with candidate structure and voter mapping; sign and broadcast the transaction to obtain the contract address.
Transaction to Execute Smart Contract4:45
Explore how to use the web3js library to execute smart contracts via transactions, including transferring funds, deploying contracts, and calling contract functions to vote and interact with other contracts.

Requirements

This course is start from beginning so every student could joint.

Description

What is Etherum ?

Ethereum is an open source, globally decentralized computing infrastructure that executes programs called smart contracts. It uses a blockchain to synchronize and store the system’s state changes, along with a cryptocurrency called ether to meter and constrain execution resource costs.

The Ethereum platform enables developers to build powerful decentralized applications with built-in economic functions. While providing high availability, auditability, transparency and neutrality, it also reduces or eliminates censorship, and reduces certain counterparty risks.

What is a smart contract ?

The term smart contract has been used over the years to describe a wide variety of different things. In the 1990s, cryptographer Nick Szabo coined the term and defined it as “a set of promises, specified in digital form, including protocols within which the parties perform on the other promises”. Since then, the concept of smart contracts has evolved, especially after the introduction of decentralized blockchain platforms with the invention of Bitcoin in 2009. In the context of Ethereum, the term is actually a bit of a misnomer, given that Ethereum smart contracts are neither smart nor legal contracts, but the term has stuck. In this book, we use the term “smart contract” to refer to immutable computer programs that run deterministically in the context of an Ethereum Virtual Machine as part of the Ethereum network protocol, i.e. on the decentralized Ethereum world computer.

What is a DApp?

A Decentralized Application, or DApp, is an application which is mostly or entirely decentralized.

Consider all the possible aspects of an application that may be decentralized:

Front-end software
Back-end software (logic)
Data storage
Name resolution
Message communications

What is Web3.js ?

web3.js is a collection of libraries which allow you to interact with a local or remote

ethereum node, using a HTTP or IPC connection.

You will learn

installation
the big picture
network
- create web3 object
- local hosted with ganache
- remote hosted with infura
account
- create new account
- get account balance
- wallet
block chain
- block inspection
- subscribe block headers
- subscribe pending transactions
contract
- create contract
- call method
- sub event
transaction
- transaction deploy contract
- transaction send ether
- transaction write to smart contract

Blockchain and Ethereum dapp right now are very hot technical trend. Developer with good skill of blockchain and Dapp very easy to get jobs with 6 figures. Are you interesting joining the huge innovation of Dapp ? Joint my course and I will show you.

Who this course is for:

Developer want to practically know how to working with web3js library

Ethereum : Master Web3js Library

What you'll learn

Explore related topics

Course content

Install and Introduction4 lectures • 5min

Web3js and Account4 lectures • 21min

Web3js and Blockchain6 lectures • 31min

Web3js and Smart Contract3 lectures • 13min

Web3js and Transaction5 lectures • 36min

Requirements

Description

Who this course is for: