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

[Jesse Graupmann]

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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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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