[Flashcoders] Inconsistent Constant
In the following example should maxHeight and maxWidth be constants?
If not, why?
class Box {
//accessing a static property through a method.
//The box class, with methods to set and retreive the
//value of the class property, numSides.
//
//The class property numSides
private static var numSides:Number = 4;
//
private var width:Number;
private var height:Number;
private var area:Number;
//
//all CAPS denotes constants, values that never change.
private static var DEFAULT_WIDTH:Number = 30;
private static var DEFAULT_HEIGHT:Number = 20;
//SHOULD THESE BE CONSTANT
public static var maxWidth = 250;
public static var maxHeight = 250;
//
//The constructor function.
public function Box(w:Number, h:Number) {
if (w == undefined) {
w = DEFAULT_WIDTH;
}
if (h == undefined) {
h = DEFAULT_HEIGHT;
}
width = w;
height = h;
//initialize area. This is perfectly legal within a constructor
area = width*height;
}
//Method for setting numSides.
public function setNumSides(newNumSides:Number):Void {
numSides = newNumSides;
}
//Method for getting numSides.
public function getNumSides():Number {
return numSides;
}
}
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Re: [Flashcoders] Inconsistent Constant
Chris...
Firstly - Flash doesn't have the concept of constants, so you couldn't
enforce a constant even if you wanted to (except by a hack like
defining a null set() function, but that's beside the point a bit)...
you can only suggest that specific things should be constant by
convention i.e. tell all your coders to treat variables in capitals as
constant and not to change their values.
Secondly - who knows? Those variables aren't actually referred to in
the code except for on their defining lines. They could be used for
absolutely anything at all. You'd need to be much clearer on the
purpose of those variables before anyone could tell you if they
'should' be constant. But see my first paragraph.
I could answer more fully if I knew why you were asking, and what the
values were actually supposed to be...
Ian
On 3/20/06, Chris [EMAIL PROTECTED] wrote:
In the following example should maxHeight and maxWidth be constants?
If not, why?
class Box {
//accessing a static property through a method.
//The box class, with methods to set and retreive the
//value of the class property, numSides.
//
//The class property numSides
private static var numSides:Number = 4;
//
private var width:Number;
private var height:Number;
private var area:Number;
//
//all CAPS denotes constants, values that never change.
private static var DEFAULT_WIDTH:Number = 30;
private static var DEFAULT_HEIGHT:Number = 20;
//SHOULD THESE BE CONSTANT
public static var maxWidth = 250;
public static var maxHeight = 250;
//
//The constructor function.
public function Box(w:Number, h:Number) {
if (w == undefined) {
w = DEFAULT_WIDTH;
}
if (h == undefined) {
h = DEFAULT_HEIGHT;
}
width = w;
height = h;
//initialize area. This is perfectly legal within a
constructor
area = width*height;
}
//Method for setting numSides.
public function setNumSides(newNumSides:Number):Void {
numSides = newNumSides;
}
//Method for getting numSides.
public function getNumSides():Number {
return numSides;
}
}
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Re: [Flashcoders] Inconsistent Constant
Ian,
Flash doesn't have the concept of constants, so you couldn't
enforce a constant even if you wanted to (except by a hack like
defining a null set() function, but that's beside the point a bit)...
you can only suggest that specific things should be constant by
convention
It's not really beside the point. We define constants in this way...
class Test {
public static function get SOME_CONSTANT():String {
return value;
}
}
...which works perfectly.
--
Steve Webster
Head of Development
Featurecreep Ltd.
http://www.featurecreep.com
14 Orchard Street, Bristol, BS1 5EH
0117 905 5047
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Fwd: [Flashcoders] Inconsistent Constant
Ian,
Flash doesn't have the concept of constants, so you couldn't
enforce a constant even if you wanted to (except by a hack like
defining a null set() function, but that's beside the point a bit)...
you can only suggest that specific things should be constant by
convention
It's not really beside the point. We define constants in this way...
class Test {
public static function get SOME_CONSTANT():String {
return value;
}
}
...which works perfectly.
PS. Sorry if I sounded a little short in the above e-mail; I sent it
in a hurry and forgot to add relevant smilies :o)
--
Steve Webster
Head of Development
Featurecreep Ltd.
http://www.featurecreep.com
14 Orchard Street, Bristol, BS1 5EH
0117 905 5047
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RE: [Flashcoders] Inconsistent Constant
I agree with that. I set constants like that so I cant overwrite them on
accident.
Jim
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Steve
Webster
Sent: 20 March 2006 17:36
To: Flashcoders mailing list
Subject: Re: [Flashcoders] Inconsistent Constant
Ian,
Flash doesn't have the concept of constants, so you couldn't
enforce a constant even if you wanted to (except by a hack like
defining a null set() function, but that's beside the point a bit)...
you can only suggest that specific things should be constant by
convention
It's not really beside the point. We define constants in this way...
class Test {
public static function get SOME_CONSTANT():String {
return value;
}
}
...which works perfectly.
--
Steve Webster
Head of Development
Featurecreep Ltd.
http://www.featurecreep.com
14 Orchard Street, Bristol, BS1 5EH
0117 905 5047
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Re: [Flashcoders] Inconsistent Constant
Steve,
Fine. :-) My two-second thought works, then. Haven't tried that, but
may well start using it - it only just occurred to me as a method as I
was writing the post. :-)
I stand corrected. :-)
That doesn't gainsay the second part of the posting - there really
isn't enough detail in that original post to answer the poster's
question.
Ian
On 3/20/06, Steve Webster [EMAIL PROTECTED] wrote:
Ian,
Flash doesn't have the concept of constants, so you couldn't
enforce a constant even if you wanted to (except by a hack like
defining a null set() function, but that's beside the point a bit)...
you can only suggest that specific things should be constant by
convention
It's not really beside the point. We define constants in this way...
class Test {
public static function get SOME_CONSTANT():String {
return value;
}
}
...which works perfectly.
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RE: [Flashcoders] Inconsistent Constant
Just a quick note on this. There are ways to prevent variables from being
overwritten. ASSetPropFlags.
Here is a description as to its usage.
http://www.flashguru.co.uk/assetpropflags/
It's kind of strange, but it's useful once and awhile.
Scott
-Original Message-
From: [EMAIL PROTECTED] on behalf of Jim Tann
Sent: Mon 3/20/2006 1:27 PM
To: Flashcoders mailing list
Cc:
Subject:RE: [Flashcoders] Inconsistent Constant
I agree with that. I set constants like that so I cant overwrite them on
accident.
Jim
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Steve
Webster
Sent: 20 March 2006 17:36
To: Flashcoders mailing list
Subject: Re: [Flashcoders] Inconsistent Constant
Ian,
Flash doesn't have the concept of constants, so you couldn't
enforce a constant even if you wanted to (except by a hack like
defining a null set() function, but that's beside the point a bit)...
you can only suggest that specific things should be constant by
convention
It's not really beside the point. We define constants in this way...
class Test {
public static function get SOME_CONSTANT():String {
return value;
}
}
...which works perfectly.
--
Steve Webster
Head of Development
Featurecreep Ltd.
http://www.featurecreep.com
14 Orchard Street, Bristol, BS1 5EH
0117 905 5047
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