Re: [Flashcoders] 'trace' executes function
On 02/02/2011 10:12, Wenzler, Thomas wrote:
Hi List, I just made a little experiment with this code...
function setMovieClipX(mc,desiredCoordX):Boolean
{
var updated:Boolean=true;
(desiredCoordX!=mc.x)?mc.x=desiredCoordX:updated=false;
"If the x posn isn't the right one move the movieclip, otherwise update
the status"
return updated;
}
trace(setMovieClipX(movieClip,286));
...and found to my utmost surprise that the trace command actually executed the
function and updated the movieClip.x position instead of just tracing true or
false.
It's just doing as you ask, isn't it?
If you check omit Trace in the Publish settings, movieClip remains at it's x
Position.
Well, it would!
Wonder if this could be of any use or is a potential danger when using traces
to debug?
Unless there's something I'm missing, everything is working as I would
expect it to.
If you pass a function call as a parameter, the function is run. If the
function includes code that will move a movieclip, the clip will move.
Regards
Thomas
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Re: [Flashcoders] 'trace' executes function
trace() is a normal function. If you pass arguments to trace(), they
will be evaluated first.
1. trace (name == "Jens");
Wouldn't you here expect a true or false depending on your name?
2. Write a custom function to which you pass
setMovieClipX(movieClip,286). What parameter type you would use?
function testUpdate(updated : Boolean) : void {
trace ("updated", updated);
}
testUpdate(setMovieClipX(movieClip,286));
In this case it seems to be clear that the mc is positioned first.
3. I cannot count how many times I have tried to find a bug due to this
trace(expression) issue. While in DEBUG mode everything worked well, the
production version did not work :-) It is really a danger that should be
in mind.
Jens
Am 02.02.2011 11:12, schrieb Wenzler, Thomas:
Hi List, I just made a little experiment with this code...
function setMovieClipX(mc,desiredCoordX):Boolean
{
var updated:Boolean=true;
(desiredCoordX!=mc.x)?mc.x=desiredCoordX:updated=false;
return updated;
}
trace(setMovieClipX(movieClip,286));
...and found to my utmost surprise that the trace command actually executed the
function and updated the movieClip.x position instead of just tracing true or
false.
If you check omit Trace in the Publish settings, movieClip remains at it's x
Position.
Wonder if this could be of any use or is a potential danger when using traces
to debug?
Regards
Thomas
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[Flashcoders] 'trace' executes function
Hi List, I just made a little experiment with this code...
function setMovieClipX(mc,desiredCoordX):Boolean
{
var updated:Boolean=true;
(desiredCoordX!=mc.x)?mc.x=desiredCoordX:updated=false;
return updated;
}
trace(setMovieClipX(movieClip,286));
...and found to my utmost surprise that the trace command actually executed the
function and updated the movieClip.x position instead of just tracing true or
false.
If you check omit Trace in the Publish settings, movieClip remains at it's x
Position.
Wonder if this could be of any use or is a potential danger when using traces
to debug?
Regards
Thomas
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