aniket-engg/solidity-school

First place for early developers to learn Solidity

🎒 solidity-school

Solidity School is an initiative to prepare a code base for the solidity beginners by those who were beginners sometime. It categorize the smart contracts in multiple standards according to different difficulty levels. For now, standards are 0 to 5.

Idea of Solidity School is to Learn-n-Contribute. So a beginner will learn to code and can contribute too while learning.

👉 Solidity school is listed on useWeb3 platform and mostly finds a place in top 5 Most popular last week resources

How to start

To start learning, one needs to start with standard 0 (std-0). Each standard will have a problem statement and an informational hint for each task. Learners can try to write the contract to solve the problem statement by using the given hint.

Once done, final contract can be compared with the one provided in this repository. If learner thinks that his or her contract is better than the one in the repo, a Pull Request can be raised to contribute.

This project needs a great support from Blockchain enthusiasts, developer and researchers to build this school in a way which can attract learners and provide them ease for learning the development.

Categorization

Categorization of contracts in standard is done to increase the understanding.

In case of any discrepancies, discussion can be done via issues/PRs.

More Details

For various other details, visit the wiki section.

• To know about the standards, visit Standards
• How can a developer learn from this repository, visit How To Learn
• One who is looking to contribute should visit Contribution Guidelines

Solidity Version

Currently contracts in this repo support Solidity version 0.8.17 . It will be updated following the major & minor release.

NOTE: Contracts in this repository are only for learning purpose and not recommended for production use.

solidity-school's Issues

The PrimeNumber function returns true when 1 (one) is send

The number 1 (one) is not a prime number.

AttendanceRegister

Standard: 2
Sequence: 5
Contract Name: AttendanceRegister

Problem Statement:
Write a contract named "AttendanceRegister" which will be deployed by teacher. There will be a function add which will take student name, class & joiningDate and will store it where:

• Name : String to store student name
• Class : Number from 1 to 12
• Joining Date : Date timestamp of student joining day

Each student will be stored corresponding to a unique serial number called roll number.

Only teacher can add the data of student. An event will be emitted on success.

Use struct, modifier & mapping wherever applicable.

Add related hint, if required.

Please add testing sols if possible, Thanks You

PrimeNumber

Standard: 1
Sequence: 4
Contract Name: PrimeNumber

Problem Statement:
Write a contract 'PrimeNumber' which implements a function named ifPrime.

ifPrime() accepts a number and return true if number is a prime number else false. This function should not consume any gas.

Add related hint, if required.

4_Onboarding

Standard: 3
Sequence: 4
Contract Name: childOrgEnrollment
Problem Statement: https://github.com/Aniket-Engg/solidity-school/tree/master/std-3/4_Onboarding

Solve the problem statement.

Contribution guidelines: https://github.com/Aniket-Engg/solidity-school/wiki/Contribution-Guidelines

childOrgEnrollment

Standard: 3
Sequence: 3
Contract Name: childOrgEnrollment
Problem Statement: https://github.com/Aniket-Engg/solidity-school/tree/master/std-3/3_childOrgEnrollment

Solve the problem statement.

Contribution guidelines: https://github.com/Aniket-Engg/solidity-school/wiki/Contribution-Guidelines

CalculatorUsingLib

Standard: 3
Sequence: 1
Contract Name: CalculatorUsingLib
Problem Statement: https://github.com/Aniket-Engg/solidity-school/tree/master/std-3/1_CalculatorUsingLib

Solve the problem statement.

Contribution guidelines: https://github.com/Aniket-Engg/solidity-school/wiki/Contribution-Guidelines

AttendanceRegisterExtended

Standard: 3
Sequence: 2
Contract Name: AttendanceRegisterExtended
Problem Statement: https://github.com/Aniket-Engg/solidity-school/tree/master/std-3/2_AttendanceRegisterExtended

Solve the problem statement.

Contribution guidelines: https://github.com/Aniket-Engg/solidity-school/wiki/Contribution-Guidelines

5_CalculatorUsingInterface

Standard: 3
Sequence: 5
Contract Name: CalculatorUsingInterface
Problem Statement: https://github.com/Aniket-Engg/solidity-school/tree/master/std-3/5_CalculatorUsingInterface

Solve the problem statement.

Contribution guidelines: https://github.com/Aniket-Engg/solidity-school/wiki/Contribution-Guidelines

AllPrimeNumber

Standard: 1
Sequence: 5
Contract Name: AllPrimeNumber

Problem Statement:
Write a contract 'AllPrimeNumber' which implements a function named addPrime & getPrime.

addPrime() accepts a positive(unsigned) number and adds all the prime numbers existing from 1 to passed number in an array.

getPrime() will return the prime numbers added in previous call.

Add related hint, if required.

Time

Standard: 1
Sequence: 6
Contract Name: Time

Problem Statement:
Write a contract 'Time' which implements a function named getTime.

getTime() accepts a Unix timestamp (number of seconds since 1970-01-01 00:00:00 GMT). Method will check if this timestamp exists after the current time. If yes, it will return a timestamp after 1 hour, 20minutes and 30 seconds from passed time else return 0.

Add related hint, if required.

Is this Project Dead?

Got very excited when I saw the format of the tutorials but nothing inside except 1st 2 folders.

Rent

Standard: 2
Sequence: 4
Contract Name: Rent

Problem Statement:
Write a contract named "Rent" which will be deployed by Landlord and all ethers transferred on this contract address will be automatically transferred to landlord's address. On deployment, landlord will provide the information of tenant which will be public. Information of tenant will be name, age & occupation.

Use fallback function wherever required.

Add related hint, if required.

ThreeAndSeven

Standard: 1
Sequence: 3
Contract Name: ThreeAndSeven

Problem Statement:
Write a contract 'ThreeAndSeven' which implements a function named check.

check() accepts a number and return true if number is fully divided by 3 or 7 and greater than 10 else false. This function should not consume any gas.

Add related hint, if required.

LifeCycle

Standard: 2
Sequence: 3
Contract Name: LifeCycle

Problem Statement:
Write a function getStage(), which should take no. of months as a parameter and return the user its lifecycle stage. Stages can be:

• Infant
• Toddler
• Child
• TeenAger
• Adult
• Old

Use enum for stage listing. Use general conventions of age to categorise.
Add related hint, if required.

exercises STD3, STD4, STD5 not found

Hello, I cannot find the STD3, 4, 5 exercises.

SafeCalculator

Standard: 2
Sequence: 2
Contract Name: SafeCalculator

Problem Statement:
Extend std-1/1_Calculator/Calculator.sol with performing below checks in its methods:

• Value Overflow
• Value Underflow
• Invalid Operation

Use require or assert.
Add related hint, if required.

Status of the project

Just saw this project and seen that this is still on version 0.6.0, any plans to restart the project? If yes do let me know, even I can contribute.

existing contracts with solidity 0.6.0

Check compatibility with Solidity 0.6.0 and update wherever required

Add problems for std-3

Define standards syllabus

It will be good to give a glimpse of hierarchy of topics which will be covered in various standards.

SelfWhitelist

Standard: 1
Sequence: 7
Contract Name: SelfWhitelist

Problem Statement:
Write a contract 'SelfWhitelist' which implements two functions named whitelist & check. It maintains a list of whitelisted addresses. (Use Array)

whitelist() accepts an address as parameter and stores it in the whitelist. Passed address should be of the person calling the method.

check() checks if callee (address calling the method) exists in the whitelist and returns true otherwise false, without consuming gas.

Add related hint, if required.

Student

Standard: 2
Sequence: 1
Contract Name: Student

Problem Statement:
Write a contract 'Student' which implements a function named enroll.

enroll() takes student roll number (uint) and student name (string) as parameters and store them in a one to one mapping. Also emit en event on success with student roll number.

Add related hint, if required.