Storage Exercise

Create a contract that adheres to the following specifications:

---

Contract

Create a single contract called EmployeeStorage. It should not inherit from any other contracts. It should have the following functions:

State Variables

The contract should have the following state variables, optimized to minimize storage:

• A private variable shares storing the employee's number of shares owned
  • Employees with more than 5,000 shares count as directors and are stored in another contract
• Public variable name which stores the employee's name
• A private variable salary storing the employee's salary
  • Salaries range from 0 to 1,000,000 dollars
• A public variable idNumber storing the employee's ID number
  • Employee numbers are not sequential, so this field should allow any number up to 2^256-1

Constructor

When deploying the contract, utilize the constructor to set:

• shares
• name
• salary
• idNumber

For the purposes of the test, you must deploy the contract with the following values:

• shares - 1000
• name - Pat
• salary - 50000
• idNumber - 112358132134

View Salary and View Shares

danger

In the world of blockchain, nothing is ever secret!* private variables prevent other contracts from reading the value. You should use them as a part of clean programming practices, but marking a variable as private does not hide the value. All data is trivially available to anyone who knows how to fetch data from the chain.

*You can make clever use of encryption though!

Write a function called viewSalary that returns the value in salary.

Write a function called viewShares that returns the value in shares.

Grant Shares

Add a public function called grantShares that increases the number of shares allocated to an employee by _newShares. It should:

• Add the provided number of shares to the shares
  • If this would result in more than 5000 shares, revert with a custom error called TooManyShares that returns the number of shares the employee would have with the new amount added
  • If the number of _newShares is greater than 5000, revert with a string message, "Too many shares"

Check for Packing and Debug Reset Shares

Add the following function to your contract exactly as written below.

/**
* Do not modify this function.  It is used to enable the unit test for this pin
* to check whether or not you have configured your storage variables to make
* use of packing.
*
* If you wish to cheat, simply modify this function to always return `0`
* I'm not your boss ¯\_(ツ)_/¯
*
* Fair warning though, if you do cheat, it will be on the blockchain having been
* deployed by your wallet....FOREVER!
*/
function checkForPacking(uint _slot) public view returns (uint r) {
    assembly {
        r := sload (_slot)
    }
}

/**
* Warning: Anyone can use this function at any time!
*/
function debugResetShares() public {
    shares = 1000;
}

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Submit your Contract and Earn an NFT Badge! (BETA)

info

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