Under the migration folder, place two files with the .js extension as shown here: 1_initial_migration.js: var Migrations = artifacts.require(“./Migrations.sol”); module.exports = function(deployer) { deployer.deploy(Migrations); }; 2_deploy_contracts.js: var SimpleStorage = artifacts.require(“Addition”); module.exports = function(deployer) { deployer.deploy(SimpleStorage); }; 6.
Under the test folder place the following file; this will be used for unit testing: TestAddition.sol pragma solidity ^0.4.2; import “truffle/Assert.sol”; import “truffle/DeployedAddresses.sol”; import “../contracts/Addition.sol”; contract TestAddition { function testAddition() public { Addition adder = Addition(DeployedAddresses.Addition()); adder.addx(100,100); uint returnedResult = adder.retrievex(); uint expected = 200; Assert.equal(returnedResult, expected, “should result 200”); In order to interact with the contract, the following methods can be used.
A Complete Guide to Understanding This Blockchain Concept
As the Addition contract is already instantiated and available in the truffle console, it becomes quite easy to interact with the contract using various methods.
Run the following command: $ truffle console This will open the truffle console, which will allow interaction with the contract.
For example, in order to retrieve the address of the deployed contract, the following method can be called: truffle(development)> Addition.address ‘0x345ca3e014aaf5dca488057592ee47305d9b3e10’ To call the functions from within the contract, the deployed method is used with contract functions.
An example is shown here, in which the addx function is called and two parameters are passed: The truffle console – interaction with the contract
function Migrations() public { owner = msg.sender; function setCompleted(uint completed) public restricted { last_completed_migration = completed; function upgrade(address new_address) public restricted { Migrations upgraded = Migrations(new_address); upgraded.setCompleted(last_completed_migration); 5. Under the migration folder, place two files with the .js extension as shown here: 1_initial_migration.js: var Migrations = artifacts.require(“./Migrations.sol”); module.exports = function(deployer) { deployer.deploy(Migrations); }; 2_deploy_contracts.js: var SimpleStorage = artifacts.require(“Addition”); module.exports = function(deployer) { deployer.deploy(SimpleStorage); }; 6. Under the test folder place the following file; this will be used for unit testing: TestAddition.sol pragma solidity ^0.4.2; import “truffle/Assert.sol”; import “truffle/DeployedAddresses.sol”; import “../contracts/Addition.sol”; contract TestAddition { function testAddition() public { Addition adder = Addition(DeployedAddresses.Addition()); adder.addx(100,100); uint returnedResult = adder.retrievex(); uint expected = 200; Assert.equal(returnedResult, expected, “should result 200”); In order to interact with the contract, the following methods can be used. As the Addition contract is already instantiated and available in the truffle console, it becomes quite easy to interact with the contract using various methods. Run the following command: $ truffle console This will open the truffle console, which will allow interaction with the contract. For example, in order to retrieve the address of the deployed contract, the following method can be called: truffle(development)> Addition.address ‘0x345ca3e014aaf5dca488057592ee47305d9b3e10’ To call the functions from within the contract, the deployed method is used with contract functions. An example is shown here, in which the addx function is called and two parameters are passed: The truffle console – interaction with the contract
Why This Matters for Blockchain Technology
Understanding function Migrations() public { is not just an academic exercise — it has real-world implications for how blockchain systems are designed, deployed, and secured. Whether you are a developer building decentralized applications, a business leader evaluating blockchain adoption, or a curious learner exploring the technology, this knowledge provides a critical foundation.
Key Points to Remember
- As the Addition contract is already instantiated and available in the truffle console, it becomes quite easy to interact with the contract using various methods.
- Run the following command: $ truffle console This will open the truffle console, which will allow interaction with the contract.
- For example, in order to retrieve the address of the deployed contract, the following method can be called: truffle(development)> Addition.address ‘0x345ca3e014aaf5dca488057592ee47305d9b3e10’ To call the functions from within the contract, the deployed method is used with contract functions.
- An example is shown here, in which the addx function is called and two parameters are passed: The truffle console – interaction with the contract
Conclusion
function Migrations() public { represents one of the many innovative layers that make blockchain technology so powerful and transformative. As distributed systems continue to evolve, a solid understanding of these core concepts becomes increasingly valuable — not just for developers, but for anyone building, investing in, or working alongside blockchain-powered systems.
Whether you are just starting your blockchain journey or deepening existing expertise, mastering these fundamentals gives you the tools to think clearly about decentralized systems and make smarter decisions in this rapidly evolving space.