Hello, I am trying to implement the connect wallet : ``` import { useConnectors } from '-react/core' function YourComponent() { const { connect, connectors } = useConnectors() return ( <div> {connectors.map((connector) => connector.available() ? ( <button key={connector.id()} onClick={() => connect(connector)}> Connect {connector.name()} </button> ) : null )} </div> ) } ``` I feel like connectors will only give the wallet if I have it on my chrome extensions , so whats the point of connector.available() ? I am using : ``` const connectors = getInstalledInjectedConnectors() ```

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

Newton

Implementing the connect wallet. Can you help about connectors?

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

Hey, I’m learning Cairo and I want to know more about Gas Optimization. In Solidity compiler, there is a difference between writing uint128 and uint256. Similarly to C and other languages, for example:

```solidity
contract ThisIsNotAnOptimizedContract{
	uint128 Zero;
	uint256 One;
	uint128 Two;
}

contract ThisIsAGasOptimizedContract{
	uint128 Zero;
	uint128 Two;
	uint256 One;
}

```

`uint128` variables each occupy a separate `uint256`just for themselves, wasting 128 bits for each slot (Like the first contract). The Solidity compiler puts 2 `uint128` in the one 256-bit memory slot when they are declared next to each other. 

I’m curious if there is any similar issue in Cairo. `Uint256` uses two felt objects for low/high bits of the value.

```python
struct Uint256 {
    // The low 128 bits of the value.
    low: felt,
    // The high 128 bits of the value.
    high: felt,
}
```

Is there any similar practice in Cairo to optimize `felt` and Uint256 objects to save some compiler steps?

How do you optimize gas in Cairo with Uint256/felt?

How can I read contract memory with starknetjs?

What is the extension that shows you errors before compilation ser?

Which is this extension that shows you errors before compilation ser?

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]

I'm new to Cairo and I want to know what is the difference when I write `let x = 1;` and `tempvar x = 1;`. Is there any difference in Cairo Lang between let and tempvar?

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Implementing the connect wallet. Can you help about connectors?

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