OpenZeppelin has provided a contract that can be included in your project that provides the functionality you are looking for. Check out the OZ contract here <https://github.com/OpenZeppelin/cairo-contracts/blob/main/src/openzeppelin/access/ownable.cairo>. Once imported, you will be able to use all the functionality provided by OZ in your contract.


ㅤ
_This answer was originally posted on [Triality](https://triality.org/question/222)_

Is there a way besides manually checking the address in every function to make a function contract owner only


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/222)_

Cairo Owner Only Fuctions

How do I create my own account abstraction using starknetjs?

How can I connect a predeployed StarkNet account in Starknet-devnet using starknetjs. Is there any difference with connect an existing account (in any network)?

How can I connect a StarkNet account using starknetjs?

I am trying to index into an array in cairo, and getting the following error:


`Unknown value for memory cell at address 13:2`


The line of code throwing the error is:


`let item = arr[index]`


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_This question was originally posted on [Triality](https://triality.org/question/606)_

Cairo: Unknown value for memory cell at address

hi all. If I want to use starkex do I have to deploy my custom starkex contracts ?
however in my understanding startex is a protocol where I have to intergrate my dapp specific tx, isn't it ?
in the playground I saw there're some preimplemented tx like ERC20 interface 
is starknet a starkex with an integrated VirtualMachine ?

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

If I want to use starkex do I have to deploy my custom starkex contracts?

Hey, is there anyway to debug Cairo contracts in hardhat environment? Something like hardhat console in Solidity?

Hey, is there anyway to debug Cairo contracts in hardhat environment? Something like hardhat console in solidity

How can I prepare my Cairo lang project for an audit?

Hello! This is day 7 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 “Recursion”.  Perhaps you can help me?

```
// The following code prints the sum of the numbers from 1 to 10.
// Modify the function `compute_sum` to print all the intermediate sums:
// 1, 1 + 2, 1 + 2 + 3, ..., 1 + 2 + ... + 10.
// Note: you'll have to add the implicit argument output_ptr to the
// declaration of compute_sum (in order to use the serialize_word function):
//   func compute_sum{output_ptr: felt*}(n: felt) -> (sum: felt)

// Use the output builtin.
%builtins output

from starkware.cairo.common.serialize import serialize_word

func compute_sum(n: felt) -> (sum: felt) {
    if (n == 0) {
        // When 0 is reached, return 0.
        return (sum=0);
    }

    // Otherwise, call `compute_sum` recursively to compute 1 + 2 + ... + (n-1).
    let (sum) = compute_sum(n=n - 1);
    // Add the new value `n` to the sum.
    let new_sum = sum + n;
    return (sum=new_sum);
}

func main{output_ptr: felt*}() {
    let (res) = compute_sum(n=10);

    // Output the result.
    serialize_word(res);
    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)*

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Cairo Owner Only Fuctions

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