Blockchain

Getting Started with Ethereum Blockchain Development

Getting Started with Ethereum Blockchain Development

this tutorial will show how to develop your own Blockchain environment with Ethereum by writing, deploy and test your first smart contract πŸ™‚

steps:
1. Installation (don’t forget to create a directory before doing installations. in my case it is blockchain-project-cg)
– Node Environment. Download node.js installer here
– Solc Compiler. npm install -g solc
– Go Ethereum. Download here
– Truffle Framework. npm install -g truffle
– Ganache. npm install -g ganache-cli

2. Writing Smart Contract
– truffle-config.js (add this to)
module.exports = {
networks: {
development: {
host: “127.0.0.1”,
port: 8545,
network_id: “*” // Match any network id
}
}
};

– /contracts/counter.sol
pragma solidity ^0.5.12;
contract Counter {

event CounterIncrementedEvent(int count);
event CounterDecrementedEvent(int count);
int private count = 0;
function incrementCounter() public {
count += 1;
emit CounterIncrementedEvent(count);
}
function decrementCounter() public {
count -= 1;
emit CounterDecrementedEvent(count);
}
function getCount() public constant returns (int) {
return count;
}
}

– /migrations/2_initial_migration.js
var Counter = artifacts.require(“./Counter.sol”);
module.exports = function(deployer) {
deployer.deploy(Counter);
};

3. /test/counter_test.js
const Counter = artifacts.require(“Counter”);
contract(‘Counter test’, async (accounts) =(angle bracket) {
let instance;
before(async () =(angle bracket) {
instance = await Counter.deployed();//deploy contract
});
it(“Initial value of counter should be zero”, async () =(angle bracket) {
let count = await instance.getCount.call({from: accounts[0]});
assert.equal(count, 0);
});
});

4. ganache-cli
5. truffle test
6. You can see the result of the counter Contracts πŸ™‚ and you have successfully deployed and tested your first smart contract πŸ™‚ notice the change of block number, gas usage, etc πŸ™‚ in the next tutorial we will learn to do voting with blockchain πŸ™‚

IMPORTANT NOTES: please check the listing of codes in the video because it is not allowed to put angle brackets in the description

References:

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