ERC-721 Tokens Exercise
Create a contract that adheres to the following specifications.
Contract
Create a contract called HaikuNFT. Add the following to the contract:
- A
structcalledHaikuto store theaddressof theauthorandline1,line2, andline3 - A public array to store these
haikus - A public
mappingto relatesharedHaikusfrom theaddressof the wallet shared with, to the id of the Haiku NFT shared - A public
counterto use as the id and to track and share the total number of Haikus minted- If 10 Haikus have been minted, the counter should be at 11, to serve as the next id
- Do NOT assign an id of 0 to a haiku
- Other variables as necessary to complete the task
Add the following functions.
Constructor
As appropriate.
Mint Haiku
Add an external function called mintHaiku that takes in the three lines of the poem. This function should mint an NFT for the minter and save their Haiku.
Haikus must be unique! If any line in the Haiku has been used as any line of a previous Haiku, revert with HaikuNotUnique().
You don't have to count syllables, but it would be neat if you did! (No promises on whether or not we counted the same as you did)
Share Haiku
Add a public function called shareHaiku that allows the owner of a Haiku NFT to share that Haiku with the designated address they are sending it _to. Doing so should add it to that address's entry in sharedHaikus.
If the sender isn't the owner of the Haiku, instead revert with an error of NotYourHaiku. Include the id of the Haiku in the error.
Remember, everything on the blockchain is public. This sharing functionality can be expanded for features similar to allowing an app user to display the selected shared haiku on their profile.
It does nothing to prevent anyone and everyone from seeing or copy/pasting the haiku!
Get Your Shared Haikus
Add a public function called getMySharedHaikus. When called, it should return an array containing all of the haikus shared with the caller.
If there are no haikus shared with the caller's wallet, it should revert with a custom error of NoHaikusShared, with no arguments.
The contract specification contains actions that can only be performed once by a given address. As a result, the unit tests for a passing contract will only be successful the first time you test.
You may need to submit a fresh deployment to pass
Submit your Contract and Earn an NFT Badge! (BETA)
Hey, where'd my NFT go!?
Testnets are not permanent! Base Goerli will soon be sunset, in favor of Base Sepolia.
As these are separate networks with separate data, your NFTs will not transfer over.
Don't worry! We've captured the addresses of all NFT owners on Base Goerli and will include them when we release the mechanism to transfer these NFTs to mainnet later this year! You can also redeploy on Sepolia and resubmit if you'd like!