Using haxe nested arrays from C# side

[azrafe7]

I'd appreciate some hints with working with a haxe generated DLL from C#.

The problem I'm facing (as far as I understand it!), seems related to hxcs converting nested arrays into `Array<object>`, thus acting as untyped on the C# side.

Here's a simplified example of what I'm trying to do:

Tools.hx (converted to a net-ver=40 dll):

```haxe

typedef Sequences = Array<Array<Float>>;

class Tools {

static public function getRandSequences():Sequences {

var res:Sequences = [];

for (i in 0...3) {

res.push([for (j in 0...5) j]);

}

return res;

}

static public function flattenSequences(sequences:Sequences):String {

var stringBuf = new StringBuf();

for (seq in sequences) {

for (n in seq) {

stringBuf.add(Std.string(n) + " ");

}

stringBuf.add("\n");

}

return stringBuf.toString();

}

static public function addUpSequences(sequences:Sequences):Float {

var sum = 0.0;

for (seq in sequences) {

for (n in seq) {

sum += n;

}

}

return sum;

}

}

```

Program.cs:

```cs

...

namespace ConsoleApp

{

    using Sequences = Array<object>;            // Actually Array<Array<Double>>, but works!

    //using Sequences = Array<Array<Double>>;   // Error: Cannot implicitly convert type 'Array<object>' to 'Array<Array<double>>'

    class Program

    {

        static void Main(string[] args)

        {

            Sequences sequences = Tools.getRandSequences();

            

            String str = Tools.flattenSequences(sequences);

            System.Diagnostics.Debug.WriteLine(str);

            

            Double sum = Tools.addUpSequences(sequences);

            System.Diagnostics.Debug.WriteLine(sum);

            //Double firstNum = (Array<Double>)(sequences[0])[0];  // how can I access this, or - better - emulate the typedef from haxe

        }

    }

}

```

[azrafe7]

Sorry for the formatting (used to github markdown: how do I do it here?!), and couldn't find a preview button to doublecheck it! ;D

[Gama11]

[azrafe7]

Thanks Gama!

I think I've found a solution to my problem. This seems to work (but any comment to know if it's the correct way to do it is welcome):

    ...
    using Sequences = Array<Array<double>>;

    class Program

    {

        static void Main(string[] args)

        {

                     var sequences = Tools.getRandSequences();     // Array<object>

            System.Diagnostics.Debug.WriteLine(sequences.GetType());

            Sequences typedSequences = (Sequences)sequences.Array_cast<Array<double>>();  // Array<Array<double>>

            

            String str = Tools.flattenSequences(sequences);

            System.Diagnostics.Debug.WriteLine(str);

            

            Double sum = Tools.addUpSequences(sequences);

            System.Diagnostics.Debug.WriteLine(sum);

            double num = typedSequences[0][0];

            System.Diagnostics.Debug.WriteLine(num);

        }

    }