Ultimate guide to write your first Smart contract...

What is a Smart Contract?

A smart contract is the digital version of a contract that runs on the Blockchain nodes and is executed when a set of trigger criteria are met. The transactions that happen in a smart contract are processed by the blockchain, which means they can be sent automatically without a third party.

From a developer's point of view, smart contracts are lines of code that define the business logic.

Steps to design a smart contract:

Languages used to build Smart Contract:

• Solidity

• Golang

• Javascript

• C++

• Java

In this post we will write a simple smart contract using Solidity language.

About Solidity:

Solidity is an object-oriented, high-level language for implementing smart contracts. Solidity was influenced by C++, Python and JavaScript and is designed to target the Ethereum Virtual Machine (EVM).

Solidity is statically typed, supports inheritance, libraries and complex user-defined types among other features.

IDE used to test smart contract written in Solidity:

Remix IDE is an open source web and desktop application. It fosters a fast development cycle and has a rich set of plugins with intuitive GUIs. Remix is used for the entire journey of contract development as well as being a playground for learning and teaching Ethereum.

Simple smart contract to print "hello world!" using Solidity:

Code:

//defines the versions of the compiler that particular code is compatible with.

pragma solidity ^ 0.7.4;

//a contract is defined using contract keyword

contract HelloWorld{

//function to return a string, pure => tells that this is a read only function

function helloWorld() pure public returns(string memory){

return "Hello World!";

}

}