Your_First_Decentralized_Application

This is the code for "A Guide to Building Your First Decentralized Application" by Siraj Raval on Youtube

Overview

This is the code for this video on Youtube by Siraj Raval. It's a guide on how to build your first decentralized application.

Dependencies

• ethereumjs-testrpc
• [email protected]
• solc

Install missing dependencies with npm.

> git clone [email protected]:llSourcell/Your_First_Decentralized_Application.git
> cd Your_First_Decentralized_Application
> npm install 

Usage

After all dependancies are installed, run the testrpc service with:

node_modules/ethereumjs-testrpc/build/cli.node.js

Run the following commands to open the node console then deploy your contract to the test chain

siraj:~/hello_world_voting$ node
> Web3 = require('web3')
> web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
> code = fs.readFileSync('Voting.sol').toString()
> solc = require('solc')
> compiledCode = solc.compile(code)
> abiDefinition = JSON.parse(compiledCode.contracts[':Voting'].interface)
> VotingContract = web3.eth.contract(abiDefinition)
> byteCode = compiledCode.contracts[':Voting'].bytecode
> deployedContract = VotingContract.new(['Rama','Nick','Jose'],{data: byteCode, from: web3.eth.accounts[0], gas: 4700000})
> deployedContract.address
> contractInstance = VotingContract.at(deployedContract.address)

Interact with the contract via the html page attached, just open it in your browser. See this tutorial for more details.

Credits

The credits for this code go to maheshmurthy. I've merely created a wrapper to get people started.