Hi all, this is a question for the more experienced script programmers. I was looking at ways to optimize my code and I found that it would be handy if I could assign custom fields to item objects, because then I would be able to store calculated values on the item and if be able to use them in functions to which I would only have to pass the item as argument and not also the calculated value. Actually I wouldn’t even have to pass the items as an argument to the functions because I could make the function run on the item.

After some searching I found this: http://stackoverflow.com/questions/1646698/what-is-the-new-keyword-in-javascript

I implemented this in a small example script:

dummy = LL.getCurrentDesktop().addShortcut(“dummy”,new Intent(),0,0);

// OLD WAY

/*

function displayCenter(it, center){

it.setLabel(center[0]+”,”+center[1]);

}

function moveToCenter(it, center){

it.setPosition(center[0], center[1]);

}

function center(item){

var r=item.getRotation()*Math.PI/180;

var sin=Math.abs(Math.sin(r));

var cos=Math.abs(Math.cos(r));

var w=item.getWidth()*item.getScaleX();

var h=item.getHeight()*item.getScaleY();

return[item.getPositionX()+(w*cos+h*sin)*0.5,item.getPositionY()+(h*cos+w*sin)*0.5];

}

var center = center(dummy);

displayCenter(dummy, center);

moveToCenter(dummy, center);

*/

//NEW WAY:

myItem = function(){

this.getCenter = function(){

if(this.center==null){

alert(“test”)

var r=this.getRotation()*Math.PI/180;

var sin=Math.abs(Math.sin(r));

var cos=Math.abs(Math.cos(r));

var w=this.getWidth()*this.getScaleX();

var h=this.getHeight()*this.getScaleY();

var center = [this.getPositionX()+(w*cos+h*sin)*0.5,this.getPositionY()+(h*cos+w*sin)*0.5]

this.center = center;

}

return this.center;

};

this.displayCenter = function(){

this.setLabel(this.getCenter()[0]+”, “+this.getCenter()[1]);

};

this.moveToCenter = function(){

this.setPosition(this.getCenter()[0], this.getCenter()[1]);

};

};

myItem.prototype = dummy;

myDummy = new myItem();

myDummy.displayCenter();

myDummy.moveToCenter();

myDummy.setSize(288, myDummy.getHeight()) //ALSO STILL WORKS BOTH WORK ON SAME OBJECT DESPITE THAT I DIDN’T DEFINE A getPositionX() IN myItem

As you can see this enables me to do what I explained herebove, but I haven’t seen anyone do it before, so I am wondering if there is anything bad happening here or I actually found something cool and useful.

Please tell me what you think in the comments.

Thanks for reading

cdfa

http://stackoverflow.com/questions/1646698/what-is-the-new-keyword-in-javascript

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Hi all, this is a question for the more experienced users: I was looking at ways to optimize my code and I found that I would be handy if I could assign custom fields to item objects, but LL doesn’t allow me to. The I found this: http://stackoverflow.com/questions/1646698/what-is-the-new-keyword-in-javascript

I implemented this in a small example script:

dummy = LL.getCurrentDesktop().addShortcut(“dummy”,new Intent(),0,0);

myItem = function(){

this.getCenter = function(){

var r=this.getRotation()*Math.PI/180;

var sin=Math.abs(Math.sin(r));

var cos=Math.abs(Math.cos(r));

var w=this.getWidth()*this.getScaleX();

var h=this.getHeight()*this.getScaleY();

return[this.getPositionX()+(w*cos+h*sin)*0.5,this.getPositionY()+(h*cos+w*sin)*0.5];

};

};

myItem.prototype = dummy;

myDummy = new myItem();

alert(myDummy.getCenter()[0])

alert(myDummy.getPositionX()) // BOTH WORK ON SAME OBJECT AND DIDN’T DEFINE A getPositionX() IN myItem

I never seen anyone use this, so I was wondering if there is anything that makes this very inefficient or I actually discovered something pretty cool.

Thanks for reading

Colin

http://stackoverflow.com/questions/1646698/what-is-the-new-keyword-in-javascript

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Quick question: would it be more efficient for a script that is executed lots of times per second to get data with script.getTag() each time or to only do this once, save it to this.valueName and get it from that each time. (The data doesn’t change between script executions, and the tag would only be set once)

Might sound kinda stupid, but just to be sure…

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