Question

I have a class that needs instantiating with an object:

public class FusePumpComboBox extends Sprite
{
    private var _rowCount;

    public function FusePumpComboBox(args:Object)
    {
        _rowCount = (args.rowCount !== undefined) ? args.rowCount : 5;
    }
}

What if I don’t want to pass it a row count and instantaiate like this:

var obj:FusePumpComboBox = new FusePumpComboBox();

At the moment I get an error with mismatched number of arguments, as you’d expect. I’ve tried giving the args:Object a default value… I think this is where the solution lies, just don’t know what to give it or how (args:Object = {}) doesn’t work.

EDIT: I will also have getters and setters…

Answer 1

You could try this:

public function FusePumpComboBox(args:Object=null)
{
    _rowCount = (args && args.hasOwnProperty('rowCount')) ? args.rowCount : 5;
                       //      ^----- The correct way of checking the properties
}