# Provider object: 🔌 connect to the network :

The first thing to do: is defined with which network you want to interact. With the Provider object, you define the network to use :

`import {Provider} from 'starknet';`

## Connect your DAPP to Starknet-devnet :

`const provider = new Provider({ sequencer: { baseUrl:"http://127.0.0.1:5050"} });`If you have customized host and port during starknet-devnet initialization, adapt in accordance your script.

Newton

How do I connect my DAPP to Starknet-devnet using starknetjs?

How can I test on multi-chain with both Starknet and Ethereum?


ApeWorX: How can I test on multi-chain with both Starknet and Ethereum?

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In the medium article about 1.0.0 this is shown as the syntax for the for loop

```let sum = 0
for x in iter {
  sum = sum + x;
}```

That doesn't compile for me and loops are not mentioned on github release note.

Will recursion still be necessary if they work as they do in other languages? 

Will it be possible to invoke functions from within the loops?

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

Will it be possible to invoke functions from within the loops in Cairo 1.0?

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Does anyone know how I can create an array and populate it in the python hint?
Basically something like


```cairo
let (my_array: felt*) = alloc()
%{
  ids.my_array = [1, 2, 3]
%}
```


How can I create an array and populate it in the hint Cairo lang/Protostar?

Hey, I want to concatenate two arrays with known sizes in Cairo lang.
Is there any simple way how to do it? Can you share some of your code?

Is there any simple way to concat two arrays with known sizes in Cairo?

I have a switch statment where I need to set two distinct, values so thought I would use a tuple  or a struct but I keep getting:

For a struct

`Expected a 'felt' or a pointer type. Got:<TYPE PATH> `

For a tuple

`Expected a 'felt' or a pointer type. Got:(felt,felt) `

This is with the unset tempvar being declared before the branching, and being set in each of the paths. 


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

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How do I connect my DAPP to Starknet-devnet using starknetjs?

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Provider object: 🔌 connect to the network :

Connect your DAPP to Starknet-devnet :

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