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* Rename Base Camp to Base Learn * Rename Base Camp to Base Learn * Update learn link * change wallet type property from camel to snake case (#643) * Update api key requirement, minor style updates (#642) * Fix type and clarify inheritance ex (#655) * Document Reth snapshot URLs (#651) * feat(ecosystem): New additions to Ecosystem page (#647) * feat(ecosystem): New additions to Ecosystem page * chore(Ecosystem): Add image for Dynamic * Update preparing-for-fault-proofs-on-base-sepolia.md (#633) Update preparing-for-fault-proofs-on-base-sepolia * Fix conflict * fix conflict --------- Co-authored-by: Brendan from DeFi <brendan.forster@coinbase.com> Co-authored-by: Danyal Prout <danyal.prout@coinbase.com> Co-authored-by: wbnns <hello@wbnns.com> Co-authored-by: Olexandr Radovenchyk <radole1203@gmail.com>
84 lines
2.8 KiB
Markdown
84 lines
2.8 KiB
Markdown
---
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title: Structs Exercise
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description: Exercise - Demonstrate your knowledge of structs.
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hide_table_of_contents: false
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---
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Create a contract that adheres to the following specifications.
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---
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## Contract
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Create a contract called `GarageManager`. Add the following in storage:
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- A public mapping called `garage` to store a list of `Car`s (described below), indexed by address
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Add the following types and functions.
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### Car Struct
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Implement a `struct` called `Car`. It should store the following properties:
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- `make`
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- `model`
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- `color`
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- `numberOfDoors`
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### Add Car Garage
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Add a function called `addCar` that adds a car to the user's collection in the `garage`. It should:
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- Use `msg.sender` to determine the owner
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- Accept arguments for make, model, color, and number of doors, and use those to create a new instance of `Car`
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- Add that `Car` to the `garage` under the user's address
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### Get All Cars for the Calling User
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Add a function called `getMyCars`. It should return an array with all of the cars owned by the calling user.
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### Get All Cars for Any User
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Add a function called `getUserCars`. It should return an array with all of the cars for any given `address`.
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### Update Car
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Add a function called `updateCar`. It should accept a `uint` for the index of the car to be updated, and arguments for all of the `Car` types.
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If the sender doesn't have a car at that index, it should revert with a custom `error` `BadCarIndex` and the index provided.
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Otherwise, it should update that entry to the new properties.
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### Reset My Garage
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Add a public function called `resetMyGarage`. It should delete the entry in `garage` for the sender.
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---
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### Submit your Contract and Earn an NFT Badge! (BETA)
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:::info
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#### Hey, where'd my NFT go!?
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[Testnets](../deployment-to-testnet/test-networks) are not permanent! Base Goerli [will soon be sunset](https://base.mirror.xyz/kkz1-KFdUwl0n23PdyBRtnFewvO48_m-fZNzPMJehM4), in favor of Base Sepolia.
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As these are separate networks with separate data, your NFTs **will not** transfer over.
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**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!
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:::
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import CafeUnitTest from '../../../src/components/CafeUnitTest/index.jsx'
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<CafeUnitTest nftNum={7}/>
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<br/>
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<details>
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<summary>
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⚠️ Spoiler Alert: Open only if tests fail</summary>
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Ensure your variable sizes align with their intended use, and consider the nuances of packing in Solidity. Resources: [Solidity - Layout in Storage](https://docs.soliditylang.org/en/v0.8.17/internals/layout_in_storage.html#layout-of-state-variables-in-storage), [Variables in Struct](https://docs.base.org/base-learn/docs/structs/structs-sbs#setting-up-the-struct)
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</details>
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