DAPP Coin

Dependencies

Node.js
Truffle Framework - Tools that allow us to write smart contract - npm install -g truffle
Ganache - local blockchain
Metamask Extension - Allowing us to interact with the smart contract

Setting up your project

truffle init

Steps

Create the contract
Initialise with number of token available passed in the constructor through the migrations
Allocate the total token to the admin account
Implement Transfer tokens ** Trigger an event transfer and return bool true if successful
Implement Deligated Transfer - Complying with ERC20 Standards
- Implement Transfer From - handles the approve function: transferFrom()
  - Transfer _value amount of tokens from address _from to address _to
  - Must fire a Transfer event (Already implemented)
- Impmement the approve function - allow someone to approve another account to spend tokens on their behalf (account a approve account b to spend c amount of token on my account ) like approving exchange to spend or sell your taking
Implement Allowance - the amount of token you approve to transfer
- Takes the address of owner and spender and return uint256 remaining
- Remaining - is the amount which the _spender is still allowed to withdraw from the _owner
Implement approval event - trigger and log when the approval function is successful

Interacting with contract

Create a migration
Migrate - truffle migrate --reset
Open the console to interact with the contract - truffle console
Get an instance of the token - DappToken.deployed().then(function(i){token = i})

Testing the smart contract (Mocha Test Framework and Chai)

Create the test file - test/DappToken.js

Checking how many tokens u have

Using ERC20 Formart, the balanceOf function returns the balance of an address

Truffle Command

Test: truffle test
Enter the Console: truffle console

Web3 Library for interacting with smart contract

web3.eth.getAccounts() -> getting all accounts