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Ethereum and Solidity (Why code smt can't work (plural forms of…

- - - - Типы
        
        Возвращающие данные
        
        Не стоят денег
        
        Мгновенные
        
        Меняющие данные
        
        Время генерации блока
        
        Нужно создание транзакции
        
        Стоят денег
    - - gas
        
        gasPrice
        
        Количество Wei которе отправитель должен заплатить за 1 gas.
        
        Пример: деление стоит 5 gas. Если gasPrice = 10, то нужно заплатить 50 gas за одно деление
        
        Подробный пример
        
        Нам надо
        
        Сложить (стоит 3 gas)
        
        Умножить (стоит 5 gas)
        
        Итог
        
        =300(Wei/gas) 8gas = 2400 wei
        
        Данные транзикции
        
        gasPrice = 300
        
        gasLimit = 20
        
        startGas\gasLimit
      - Транзации
        
        надо платить за любые изменения блокчейна / вычисление чего-либо
    - - Basic types
        
        string
        
        Standard string
        
        int
        
        standard int
        
        uint
        
        positive int
        
        fixed/ufixed
        
        'Fixed' point number. Number with a decimal after it
        
        address
        
        Has method tied to it for sending money
        
        bool
        
        Standard bool
      - Reference Types
        
        Dynamic array
        int[]-->[1,2,3]
        
        Single type of element
        
        Can change in size over time
        
        mapping
        mapping(string=>string)
        mapping(int=>bool)
        
        Think of it as JS objects, Ruby hashes, or Python dictionary
        
        All keys must be the same type
        
        Key-value pairs
        
        All values must be of the same type
        
        fixed array {
        uint[] public myArray;
        }
        
        Single type of element
        
        Unchanged length
        
        struct
        
        Collection of key value pairs that can have different types
    - - msg.data
        
        'Data' field from the call or transaction that invoked the current function
      - msg.gas
        
        Amount of gas the current function invocation has available
      - msg.sender
        
        Address of the account that started the current function invocation
      - msg.value
        
        Amount of ether (in wei) that was sent along with the function invocation
    - - public
        
        Anyone can call this func
      - private
        
        Only this contract can call this function
      - view OR constant
        
        The function returns data and does not modify the contract's data
      - pure
        
        Function will not modify or even read the contract's data
      - payable
        
        When someone call this function they might send ether along
  - - - Portal to Etherium Network
    - - Test Etherium network, running on your computer
    - - Communication layer with actual blockchain
    - - Creates remix solution for us
      - Can grant not-requiring of metamask to see some blockchain data
        
        Through server-side rendering
    - - tool for styling and other beautiful things
- - - - https://codeshare.io/GLbX7l
        
        new web3.eth.Contract(JSON.parse(interface))
        
        Teaches web3 about what methods an inbox contract has
        
        .deploy line
        
        Tells web3 that we want to deploy a new copy of this contract
        
        .send line
        
        Instructs web3 to send out a transaction that creates this contract
    - - https://codeshare.io/ammqOb
  - - - function setMessage(string newMessage) public { message = newMessage; }
    - - function getArray() public view returns (int[]) { return myArray; }
- - - - create-react-app <desiredAppName>
    - - npm install --save web3
- - - - npm run dev
    - - Find "scripts": { //code }
      - add script called "dev"
        
        "dev": "next dev"
    - - In root dir of project, create folder "pages"
      - Create two page with name index.js
      - insert this code inside them
        
        import React from 'react';
        export default () => { return <h1>This is the campaign list page!!!</h1> };
    - - npm install --save next@4.1.4 react react-dom
    - - "dependencies": {
        
        "fs-extra": "^7.0.1",
        
        "ganache-cli": "^6.2.5",
        
        "mocha": "^5.2.0",
        
        "next": "^4.2.3",
        
        "next-routes": "^1.4.2",
        
        "node": "^11.5.0",
        
        "react": "^16.7.0",
        
        "react-dom": "^16.7.0",
        
        "semantic-ui-react": "^0.84.0",
        
        "solc": "^0.4.17",
        
        "tronbox": "^2.3.9",
        
        "tronweb": "^2.1.20",
        
        "truffle-hdwallet-provider": "^1.0.2",
        
        "web3": "^1.0.0-beta.37"
      - }
  - - - See "Add React Module to project"
      - Config web3 with a provider from metamask
        
        Create a file web3.js inside etherium folder
        
        Paste a code
        
        https://codeshare.io/5vm9o4
      - Tell web3 about deployed copy of the "CampaignFactory"
        
        Create a file factory.js inside etherium folder
        
        Paste a code
        
        https://codeshare.io/2WKnWW
      - Use factory instance to retrieve a list of deployed campaigns
        
        Use this code for index.js