If you run into errors using `ape plugins install cairo starknet` (if you are installing both the cairo and starknet plugins at the same time) please make sure that you are on the current version of [ape](https://github.com/ApeWorX/ape).

If you still have problems, you may have to set up your virtual environment and install the pip packages: ecdsa, fastecdsa, and sympy. This can be done in Ubuntu using `sudo apt install -y libgmp3-dev` or on Mac using `brew install gmp`. More information can be found in the Starknet Quickstart guide [here](https://starknet.io/docs/quickstart.html)


I’m just getting started and having problems installing the [Cairo](https://github.com/ApeWorX/ape-cairo) and [Starknet](https://github.com/ApeWorX/ape-starknet) plugins using the ape console. Why are the plugins not installed properly?

ApeWorX: Why are the cairo and starknet plugins not installing properly?

I’m signing a message using 
```
account.signMessage(data) 
```
and immediately verifying the signature with the same data and it’s returning false. I don’t see any issue open on this subject on starknet.js. Is this something you’ve already encountered by any chance?

here’s the code:

```python
const data = { types: proposeTypes, primaryType: 'Propose', domain, message };
const sig = await user.account.signMessage(data);
let res = await user.account.verifyMessage(data, sig); // returns `false`
```

I see that’s the expected way to use signMessage through the tests (https://github.com/0xs34n/starknet.js/blob/b20819424dea824c96ac31e0542733c84d87d441/__tests__/account.test.ts#L125-L126).

So I guess something’s going wrong when it comes to either hashing the data and signing it or hashing the data and verifying the signature?


btw: for those wondering: `verifyMessage` only works if the account is deployed: if you’re doing this with an account not deployed (basically just a keypair) then this won’t work :)

signing a message using account.signMessage(data) | starknet.js

Why should I run a Pathfinder node?

How do I interact with my Pathfinder node?

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?

Why do I need to fund an account before deploying it?


ApeWorX: Why do I need to fund a Starknet account before deploying it?

Hello! This is day 3 of the 17 days of the Cairo Challenge. And I have no idea how to solve the [playground](https://www.cairo-lang.org/playground/) exercise “Conditionals”. Perhaps you can help me?

```python
// The function `abs_eq` should return 1 if its inputs
// are equal or differ only in sign and 0 otherwise.
// Its current implementation is incorrect.
//
// 1. Click on "Run" to see where it fails.
// 2. Fix the body of `abs_eq`, so that the
//    program terminates successfully.

// Returns 1 if |x| = |y| (that is, x = y or x = -y),
// 0 otherwise.
func abs_eq(x: felt, y: felt) -> (bit: felt) {
    if (x == -y) {
        return (bit=1);
    } else {
        return (bit=0);
    }
}

func main() {
    let (bit) = abs_eq(2, -2);
    assert bit = 1;

    let (bit) = abs_eq(2, 3);
    assert bit = 0;

    let (bit) = abs_eq(2, 2);
    assert bit = 1;

    return ();
}
```

---


> 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 make conditional expressions if..then..else in Cairo lang?

Is there an equivalent of return (true) in cairo on Starknet?


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/686)_

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