there's `shortString.decodeShortString` 👍

From a high level language background and haven't seen shortStrings people assume it has something to do with felts, but  someone explain why we use Shortstrings? https://www.cairo-lang.org/docs/how_cairo_works/consts.html#short-string-literals
that's why starknet.js checks if a short string is 31 characters long

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

Newton

anyone has a function that converts an array of felts (numbers) to a single string in JS?

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

Do you know a function that converts an array of felts (numbers) to a single string in JS? [Cairo Lang]

Hello! This is day 9 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 “Field Elements 2”.  Perhaps you can help me?

```
// As you saw in the previous challenge, the operator '/' does not denote
// truncated (i.e., rounding down) integer division as in other programming
// languages. Instead, one can use library functions such as
// unsigned_div_rem().
//
// Note that unsigned_div_rem() does not work for negative numbers.

%builtins output range_check

// Import unsigned_div_rem() from the math module.
from starkware.cairo.common.math import unsigned_div_rem
from starkware.cairo.common.serialize import serialize_word

func main{output_ptr: felt*, range_check_ptr}() {
    let (q, r) = unsigned_div_rem(value=12, div=3);
    // Output the quotient (12 // 3).
    serialize_word(q);
    // Output the remainder (12 % 3).
    serialize_word(r);

    // Add code that outputs the quotient and remainder of 13 / 3 in addition to 12 / 3 here.

    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 divide felt in Cairo Lang using unsigned_div_rem?

How can I send a Uint256 amount of ERC20 tokens from L1 to starknet?
I have "amount" as a uint256 on L1 but how should I build my payload for "`sendMessageToL2`" to match the Uint256 format of Cairo?

---

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How can I send a Uint256 amount of ERC20 tokens from L1 to starknet? And how should I build my payload for "sendMessageToL2" to match the Uint256 format of Cairo?

What is the technical difference between Solidity -> Cairo transpiler and ZK-EVM Kakarot for StarkNet? Both of them interpret Solidity into Cairo and it can help Solidity developers to use StarkNet. 

But really, how does [Kakarot](https://github.com/sayajin-labs/kakarot) compare to [Nethermind's Warp](https://github.com/NethermindEth/warp)?

What is the technical difference of Kakarot compare to Nethermind's Warp?

Hello, is there a javascript version of StarkEx playground?

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

Is there a javascript version of StarkEx playground?

Hello, I am getting the following error in my starknet contract, does anyone know how to resolve it?


`Accessing struct/tuple members for r-value structs is not supported yet.`


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/665)_

Cairo error: Accessing struct/tuple members for r-value structs is not supported yet

anybody manged to declare contracts with the new nile?

```
Error: AssertionError: Sender must be passed explicitly when making a direct declaration using --no_wallet.
```

I saw a hardhat issue aswel

must be an upstream thing

https://docs.starknet.io/docs/Blocks/transactions/#calculating-the-hash-of-a-v1-declare-transaction

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

An error “AssertionError: Sender must be passed explicitly when making a direct declaration using —no_wallet.” using the new nile?

Does AA support "Session Keys" so I can avoid signing too many transactions when they are redundant?

---

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Do you know a function that converts an array of felts (numbers) to a single string in JS? [Cairo Lang]

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