Design

• We want to be able to generate random Hereos.
• The user gets to put in their class of hereo on generation
  • classes: Mage, Healer, Barbarian
  • Class will not influence stats created, therefore getting an epic hero will be hard.
• I want to be paid... 0.05 eth per hero!
• I should be able to get my heroes I have generated.
• Heroes should be stored on the chain.
• stats are strength, health, intellect, magic, dexterity
• stats are randomly generated
  • A scale of 1 - 18
  • The stats are randomly picked and their amplitude is randomly determined according to the following:
    • Stat 1 can max at 18
    • Stat 2 can max at 17
    • Stat 3 can max at 16
    • ...
• You could imagine these being an NFT
  • They are non divisable

WE WILL TEST TOO

Its important to get into the habbit.

Things for me not to forget

How to generate Randomness?

function generateRandom() public view returns (uint) {
    return uint(keccak256(abi.encodePacked(block.difficulty, block.timestamp)));
}

Lets talk bits and information

function _what_is_my_name_(a: number, b: number): boolean {
    return a & b === b;
}

First lets talk boolean logic

• and
• or
• not
• exclusive or

Bases

What are bases?

Questions

Ask the questions

Binary Positions and Implications

• What is numbers in Decimal
• What is numbers in Binary
• multiplying by 2 (don't forget shift)
• Power of 2 numbers
• Work through some examples
• Quick Mafs
• Logic Operations
• BLOW YOUR MIND

Lets talk bits and information

function _what_is_my_name_(a: number, b: number): boolean {
    return a & b === b;
}

Questions?

Lets get back to that contract

What is the size of our finished contract.

Did you know you can only have 24kb?

YIKES....

Every time your contract gets deployed again (upgrade / bug fix) address changes??

• What if you had money associated with a contract?
• What if you had data associated with that contract?

YIKES....

Don't worry! There is a solution.

But there is a bit we have to learn to understand it

YIKES...

Questions?

The Point of This Course

• If you forget solidity, dont worry!
  • The documentation is really good
  • Cryptozombies.io is one of the best