Have a look at this: https://github.com/apibara/starknet-react/blob/main/examples/starknet-react-next/src/components/ConnectWallet/connect.tsx 

**I want to put a disconnect button in my dapp, does anyone know how to do this on the frontend?**

kermo

anyone know how to disconnect the connected wallet on the frontend with starknetjs or another way?


Hello! This is day 16 of the 17 days of the Cairo Challenge. In this exercise it is required to submit your first StarkNet contract. When you try to make it, you get an error:

```solidity
Error: code:20:1: Unsupported %lang directive. Are you using the correct compiler?
%lang starknet
^************^
```

Can you show your solution to [playground](https://www.cairo-lang.org/playground/) exercise “StarkNet contract” and also send a link to your contract, and a screenshot where you use your `add` method?

```solidity
// [StarkNet](https://starkware.co/product/starknet/) is a permissionless decentralized ZK-Rollup operating
// as an L2 network over Ethereum, where any dApp can achieve
// unlimited scale for its computation, without compromising
// Ethereum's composability and security.
//
// This is a simple StarkNet contract.
// Note that you won't be able to use the playground to compile and run it,
// but you can deploy it on the [StarkNet Planets Alpha network](https://medium.com/starkware/starknet-planets-alpha-on-ropsten-e7494929cb95)!
//
// 1. Click on "Deploy" to deploy the contract.
//    For more information on how to write Cairo contracts see the
//    ["Hello StarkNet" tutorial](https://cairo-lang.org/docs/hello_starknet).
// 2. Click on the contract address in the output pane to open
//    [Voyager](https://goerli.voyager.online/) - the StarkNet block explorer.
// 3. Wait for the page to load the information
//    (it may take a few minutes until a block is created).
// 4. In the "STATE" tab, you can call the "add()" transaction.

// The "%lang" directive declares this code as a StarkNet contract.
%lang starknet

@view
func add(x: felt, y: felt) -> (res: felt) {
    return (res=x + y);
}
```

---

> Answers to this question are a part of the ✨ 17 days of Cairo Lang with Playground & Newton. ✨
> 

*Vote for your favorite answer - the best answer will win a $10 award. A new day – a new reward! During the next 17 days, our goal is to attract more developers to the Cairo language and to systematize the knowledge of Cairo lang. [Read rules](https://www.notion.so/17-days-of-Cairo-Lang-with-Newton-550dfcda6a2d449ca468be293c776578)*

How to submit a StarkNet contract?

Hi! I like writing my Cairo code in vim. However, I don't like that Cairo lang code has no auto-format and syntax highlighting (see screenshot):

![https://sun9-86.userapi.com/impg/oNPtr4oks9yNwg3MDoX8c5b-B4IBgK1DARpTbg/RJgXBHR3mEY.jpg?size=1242x682&quality=96&sign=3390ee79c30971ba0dc245122af04905&type=album](https://sun9-86.userapi.com/impg/oNPtr4oks9yNwg3MDoX8c5b-B4IBgK1DARpTbg/RJgXBHR3mEY.jpg?size=1242x682&quality=96&sign=3390ee79c30971ba0dc245122af04905&type=album)

I'm looking for a plugin to write Cairo contracts on Starknet in vim with all pretty formatting. Can you recommend any and how to install it as well?



Does anyone know a vim plugin for StarkNet smart contracts?

Hi, just saw starknet.js latest is now 4.4 and not 3.x anymore. Do you plan to move the that release at what horizon? Is there some known issues staying with 3.x and working with starknet-react?

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Is there any issue between using 4.4 and 3.x starknet.js?

Another vanilla Cairo question, what are the sorts of references, i.e. ids that can be modified by hints? relatively important to work against an evil prover

presumably not locals or tempvars, but say, implicit references, or the two(?) kinds of let statements (expressions and references)

maybe if there's some documentation i don't know about re: all the id types, relocatable values and so on,

also maybe, is there a pattern that can be used for function pointers?

Another vanilla Cairo question, what are the sorts of references

Can someone explain what "Error: ... Cannot unpack x ..." means?


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/417)_

Cairo: Cannot unpack error

1. What’s the difference between AA (Abstract Account) and EOA (Externally Owned Account)?

2. What is an abstract account? Where is the account address derived from? Does the account address also come from the mnemonic and the private key?

3. What is multi-call? What will it bring to UX?

Can you explain what is Abstract Account?

I have a question about how to print "Hello World" in Cairo 1. How do I log/print ?

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anyone know how to disconnect the connected wallet on the frontend with starknetjs or another way?

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