Calling an Array[] for a function is sending an error.

[Monko]

I am working in java script, and creating an array. For some reason, unity is giving me an error “implicit downcast from object to int”

Here is a sample of the code causing the error:

internal var testarray : Array[] = new Array [3];

function Start () {
testarray[0] = [0,1,2,3];
testarray[1] = [4,5,6,7];

testfunction(testarray[0][2]);
}

function testfunction ( testvar : int)
{

}

I get this error a lot, and its usually because I forgot do define a variable. So I fix it. But this time, I have defined the variable, and yet its still giving the error. Does anyone know why?

[Loius]

Well, Arrays are collections of objects. That’s just all they know how to do. If you want specific types you should use List (which also gives you type safety and lots of nice functions like Sort and greatly reduces the number of casts you have to do)

To get from an Array entry to a specific type, you have to cast. Either (type)array[index], or array[index] as type, depending on stuff. Base types like int and float and such need (int)array[index].

The () method can throw exceptions, while the as method can return null (in case you want to check ob as GameObject != null)

[Eric5h5]

Don’t use Array. Use built-in arrays, or generic Lists.

var testArray : int[,];

function Start () {
    testArray = new int[4, 2];
    testArray[0, 0] = 55;
}

[Monko]

OK, I answered my own question. When Eric5h5 got me researching lists, I found this:

http://wiki.unity3d.com/index.php?title=Which_Kind_Of_Array_Or_Collection_Should_I_Use%3F

Near the bottom of the page it talks about jagged arrays, which is just what I need. I tested it out, and no errors appeared!

Here is a sample of the code to show how I use the jagged array:

 var myJaggedArray = [ [1, 2, 3], [4, 5, 6], [7, 8, 9,] ]; // a jagged int array   
    function Start () {
    print(myJaggedArray[2][1]); //this will print 5
    }