Explore blockchain development with Solidity and Next.js. Gain insights into Ethereum dApps, smart contracts, and Web3 integration, enabling you to launch and scale dApps effectively.

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Explore the dynamic world of decentralized applications (dApps) with this course on Solidity and Next.js. You will grasp why developers are keen to learn about blockchain technology and its transformative potential in digital interactions. 

Initially, you will delve into Solidity, the leading language for writing Ethereum smart contracts, understanding its syntax and functionalities using Remix IDE. Then, you’ll transition to integrating your contracts into a web application using Next.js, a powerful React framework that enables server-side rendering and static site generation for faster, scalable dApps. You will sequentially build your application, beginning with smart contract development, setting up your Next.js environment, and linking with Web3 technologies. 

After taking this course, you will be equipped to launch your dApp, potentially unlocking new opportunities in the blockchain space and acting as a gateway to the future of decentralized applications.

Ethereum Blockchain Development with Solidity and Next.js

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

// error messages
string constant emailAlreadyExistsMsg = "Email already exists!";
string constant addressAlreadyExistsMsg = "Address already exists!";

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

enum ProfileType { Creator, Applicant }

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

import "./enums.sol";

struct CreatorProfile {
    uint id;
    string email;
    string name;
    string tagline;
    string description;
    address creatorAddress;
    bool verified;
    ProfileType profileType;
    uint[] jobOfferIDs;
}

struct ApplicantProfile {
    uint id;
    address applicantAddress;
    string fullname;
    string email;
    string location;
    string bio;
    ProfileType profileType;
    uint[] applicationIDs;
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

import "./structs.sol";
import "./constants.sol";
/**
 * @title SolJobs
 * @dev Create, apply and award remote jobs on the blockchain
 */

contract SolJobs {
    address private manager;

    mapping (address => CreatorProfile) public creatorProfiles;
    mapping (address => ApplicantProfile) public applicantProfiles;

    uint internal numberOfCreatorProfiles;
    uint internal numberOfApplicantProfiles;

    mapping (string => bool) private creatorEmails;
    mapping (string => bool) private applicantEmails;

    mapping (address => bool) private creatorAddresses;
    mapping (address => bool) private applicantAddresses;

    constructor() {
        manager = msg.sender;
    }

    modifier accountIsUnique(string calldata _email) {
        require(creatorEmails[_email] == false && applicantEmails[_email] == false, emailAlreadyExistsMsg);
        require(creatorAddresses[msg.sender] == false && applicantAddresses[msg.sender] == false, addressAlreadyExistsMsg);

        _;
    }

    event CreatorProfileCreated(uint newCreatorID);
    event ApplicantProfileCreated(uint newApplicantID);

    function createCreatorProfile(
        string calldata _name,
        string calldata _email,
        string calldata _description,
        string calldata _tagline
    ) accountIsUnique(_email) external {
        uint creatorID = ++numberOfCreatorProfiles;

        CreatorProfile storage profile = creatorProfiles[msg.sender];
        profile.id = creatorID;
        profile.name = _name;
        profile.email = _email;
        profile.description = _description;
        profile.tagline = _tagline;

        // add to emails and addresses list
        creatorEmails[_email] = true;
        creatorAddresses[msg.sender] = true;

        // defaults
        profile.verified = false;
        profile.profileType = ProfileType.Creator;
        profile.creatorAddress = msg.sender;

        emit CreatorProfileCreated(creatorID);
    }

    function createApplicantProfile(
        string calldata _fullname,
        string calldata _email,
        string calldata _location,
        string calldata _bio
    ) external accountIsUnique(_email) {
        uint applicantID = ++numberOfApplicantProfiles;

        ApplicantProfile storage profile = applicantProfiles[msg.sender];
        profile.id = applicantID;
        profile.fullname = _fullname;
        profile.email = _email;
        profile.location = _location;
        profile.bio = _bio;
        
        // add to emails and addresses list
        applicantEmails[_email] = true;
        applicantAddresses[msg.sender] = true;

        // defaults
        profile.profileType = ProfileType.Applicant;
        profile.applicantAddress = msg.sender;

        emit ApplicantProfileCreated(applicantID);
    }
}

Learn to extend our smart contract to allow users to create profiles and apply for jobs.

Blockchain, Ethereum, and Smart Contracts

Introduction to the Solidity Programming Language

Functions in Solidity

Creating Our Project: The Smart Contract

Create a Decentralized Hiring dApp with Solidity and Next.js

Wrapping Up

Appendix

Decentralized Bank Application Using Solidity Smart Contracts

Smart Contract: Creator and Applicant Profiles

Project structure