Re: [Flashcoders] [AS3] optional parameters - sans defaults for Boolean/Number/int

[Glen Pike]

Hi,

   You can have * to specify any parameter:

   function myFunc(param1:Boolean, param2:*);

Matthew Houliston wrote:

don't you mean

    function test2 ( a:Boolean = false )
    {
        trace( "a: " + ( a == true ) );
    }

?


A Boolean is never null.

    var b:Boolean;
    trace(b);



On 29/02/2008 10:42, Jesse Graupmann wrote:

I'm trying to create typed functions using optional parameters sans the

defaults. I'm finding String to be the only thing that allows for null to be

passed. Is there a way to extend that functionality to other types like;
Numbers, Booleans, and/or ints?

NOTE : I am aware of ...rest and passing an object like what's used in
Tweener but that hides too much.


Thanks in advance,
Jesse



//    EXPECTED


    function test ( a:String = null )     {
        trace( "test: " + ( a == null ) );
    }

test ( "test" ); // false

    test ( ); // true <--- GOOD




//    UNFORTUNATE

function test2 ( a:Boolean = false ) {

        trace( "a: " + ( a == null ) );
    }
    test2 ( true ); // false
    test2 ( false ); // false
    test2 ( ); // false <--- BAD



//    IDEAL


    function test4 ( b:Boolean = null )
    {
        trace( b==null );
    }

function test5 ( n:Number = null )

    {
        trace( isNaN(n) );
    }

function test6 ( i:int = null ) {

        trace( isNaN(i) );
    }

    test4 ( ); // true <--- DESIRED
    test5 ( ); // true <--- DESIRED
    test6 ( ); // true <--- DESIRED



//    CURRENT WORK AROUND -- ONLY WORKS WHEN NEEDING POSITIVES


    function test7 ( w:Number = -1, h:Number = -1 )     {
        trace( (w < 0 || h < 0) );
    }

    test7 (10, 10); // false
    test7 (10); // true
    test7 (); // true

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--

Glen Pike
01736 759321
www.glenpike.co.uk <http://www.glenpike.co.uk>
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