Blockchain-North-East-Solidity-For-Beginners

https://docs.google.com/presentation/d/1tZCOUgVF_1sgipIbyFr8JYp6vIibzg3VZ4SM9p_1tqA/edit?usp=sharing

Things We’ll Cover

• Things you need to know
• Dependencies
• Link to code repository
• Benefits of Ethereum Smart Contracts
• Setup Development Environment
• Building The Smart Contract
• Building the Interface
• Summary

Things You Need To Know

• Basic programming
  • Variables
  • Classes
  • Functions and methods
• HTML
• CSS
• JavaScript
• IDEs

Dependencies and Tools

• Remix online Solidity IDE - https://remix.ethereum.org
• Ganache - http://truffleframework.com/ganache/
• Web3.js
• Twitter Bootstrap

Link to Code Repository

https://github.com/Samyoul/Blockchain-North-East-Solidity-For-Beginners

Applications of Ethereum Smart Contracts

Applications

• Finance
• Education
• Recruitment
• Medicine
• Gambling

Setting Up the Development Environment

• Launch Remix
• Launch Ganache

Building The Smart Contract

• Define the pragma
• Create the contract “BlockchainNorthEast”
• Set variables
  • organisers (mapping(address => bool))
  • attendees (mapping(address => bool))
  • attendeeCount (uint128)
• Getters
  • getAttendeeCount view
  • isAttendee view
  • isOrganiser view
• Setters -addAttendee - (as long as they are not in the list) -removedAttendee - (as long as they are in the list) -Modifiers -onlyByAttendee(address _address) -Demonstrate Remix test functionality

Building the Interface

• Copy in some boilerplate HTML, includes TWBS for prettification
• Add web3.js (https://github.com/ethereum/web3.js/tree/1.0/dist)
• (https://raw.githubusercontent.com/ethereum/web3.js/1.0/dist/web3.min.js)
• Add provider / connect to a node
• Define ethereum account we will write with
• Define contract we will be working with
• Define contract location (Contract’s ethereum address)
• Interacting with the Ethereum contract methods.
• Getting data from the contract
• Setting data in the contract
• Displaying data from the contract

Summary

• Uses and benefits of Ethereum Smart Contracts
• Basic Development Tools, Remix and Ganache
• Building a contract
  • Pragma
  • Variables
  • Getters
  • Setters
  • Modifiers
• Building a UI
  • Web3.js
  • Connecting to a node
  • Define Ethereum address, contract ABI, contract address
  • Interacting with the contract object with methods