I'm wanting to store four boxes in an array and iterate over all of them in a 'for' loop placing each at a different location. I'm using the isometric library As3IsoLib. Here is my code so far.
var BOX1:IsoBox = new IsoBox();
var BOX2:IsoBox = new IsoBox();
var myArray:Array = new Array(BOX1,BOX2);
for (var occr:IsoBox in myArray){
But I'm getting an error at my 'for' loop line which is
Description Resource Path Location Type
1067: Implicit coercion of a value of type String to an unrelated type as3isolib.display.primitive:IsoBox. isometric.as /main/src line 51 Flex Problem
This line:
for (var occr:IsoBox in myArray){
Should be:
for each (var occr:IsoBox in myArray){
That will solve the error. This is happening because it is intended to loop over properties of an object, not indexes of an array. So there is a strange type requirement.
The "for each" loop is much better suited to looping over elements of an array.
Related
I am in the need of multiple staged WebViews for holding multiple loaded websites at the same time.
I was hoping to manage this by making an array of webviews object, so i could call them later as view[i].
var view:Array=[webview0, webview1, webview2];
for each (var v in view){
var v:StageWebView = new StageWebView();
This gives error: 1086: Syntax error: expecting semicolon before left bracket.
Does someone know how to make an array like that?
You're doing something really weird there in terms of syntax. If you just want an Array of freshly created instances, it goes like that:
// Initialize the array.
var Views:Array = new Array;
// This loop counts 0,1,2.
for (var i:int = 0; i < 3; i++)
{
// Create a new instance.
// Yes, you can omit () with new operator if there are no arguments.
var aView:StageWebView = new StageWebView;
// Assign the new element to your array.
Views[i] = aView;
}
Or, if you need only 3 then you don't need to go algorithmic.
var Views:Array = [new StageWebView, new StageWebView, new StageWebView];
Not on topic but related:
Here is an example of one HTML page hold multiple StageWebViews
https://www.w3schools.com/graphics/tryit.asp?filename=trymap_basic_many
Actionscript provides the loop for...in to reference the element being iterated, through the key.
But the for...each...in loop yields a copy of the element rather a reference to the original element in the collection being iterated. Is there a way to get a reference to it or do I have to resort to for...in?
Consider the hypothetical:
for each( var &iter:* in collection )
I know there is no such dereferencing operator in actionscript, but can you get a reference here by any other means?
PS: Adobe's documentation states that:
variableIterant:* — The name of a variable to act as the iterant, referencing the item in a collection.
Although it's rather a copy by value and not a reference.
But the for...each...in loop yields a copy of the element rather a
reference to the original element in the collection being iterated.
Uhh... No it doesn't. Otherwise this test would yield 0 0:
var a:Shape = new Shape();
var b:Shape = new Shape();
var list:Array = [a,b];
for each(var i:Shape in list) i.x = 10;
trace(a.x, b.x); // 10 10
I want to remove the first four indexes from the array using splice(), then rebuild the array starting at index 0. How do I do this?
Array.index[0] = 'one';
Array.index[1] = 'two';
Array.index[2] = 'three';
Array.index[3] = 'four';
Array.index[4] = 'five';
Array.index[5] = 'six';
Array.index[6] = 'seven';
Array.index[7] = 'eight';
Array.splice(0, 4);
Array.index[0] = 'five';
Array.index[1] = 'six';
Array.index[2] = 'seven';
Array.index[3] = 'eight';
I am accessing the array via a timer, on each iteration I want to remove the first four indexes of the array. I assumed splice() would remove the indexes then rebuild the array starting at 0 index. it doesn't, so instead what I have done is created a 'deleteIndex' variable, on each iteration a +4 is added to deleteIndex.
var deleteIndex:int = 4;
function updateTimer(event:TimerEvent):void
{
Array.splice(0,deleteIndex);
deleteIndex = deleteIndex + 4;
}
What type of object is "Array" in the code you have shown? The Flash Array object does not have a property named "index". The Array class is dynamic, which means that it let's you add random properties to it at run time (which seems to be what you are doing).
In any case, if you are using the standard Flash Array class, it's splice() method updates the array indexes automatically. Here is a code example that proves it:
var a:Array = [1,2,3,4,5];
trace("third element: ", a[2]); // output: 3
a.splice(2,1); // delete 3rd element
trace(a); // output: 1,2,4,5
trace(a.length); // ouput: 4
trace("third element: ", a[2]); // output: 4
If I am understanding what you want correctly, you need to use the unshift method of Array.
example :
var someArray:Array = new Array(0,1,2,3,4,5,6,7,8);
someArray.splice(0,4);
somearray.unshift(5,6,7,8);
Also, you are using the Array Class improperly, you need to create an instance of an array to work with first.
The question is confusing because you used Array class name instead of an instance of an array. But as the commenter on this post said, if you splice elements, it automatically re-indexes.
im not sure what you want to do, but Array=Array.splice(0,4) should fix somethin..
I have the following code at frame one of the top layer:
var level:Array = new Array();
var level[0] = new Object();
I am getting the following error:
Scene 1, Layer 'levels', Frame 1, Line 2
1086: Syntax error: expecting semicolon before leftbracket.
I've looked at many examples which seem to be doing the same thing I'm doing, and I've also tried defining the object separately and then adding it to the array, with the same error. I've also searched for the answer, but all the questions I've found are a little different than this situation.
The syntax/grammar production
var level[0] = new Object();
is invalid.
The var production expects a simple Identifier, not an expression1. The parser was roughly trying to treat the production as var level;[0] = ..; (but failed due to the missing semicolon, and would have failed anyway because [0] = ..; is an invalid production as well).
Try:
var level:Array = new Array();
level[0] = new Object(); // no "var" here so it is a valid grammar production
or, more concisely:
var level:Array = [{}]; // using Array and Object literal notations
1 See AS3.g for that ANTLR production rules. Alternatively, for ECMAScript (from which AS derives), see 12.2 Variable Statement from ES5-Annotated and note that it requires an "Identifier" followed by an optional initializer (=) or another declaration (,) or end of statement (;).
Only is
level[0] = {};
or
level.push({});
How to make a kind of array that index things based on a object? but not being strict like dictionary.
What I mean:
var a:Object = {a:3};
var b:Object = {a:3};
var dict:Dictionary = new Dictionary();
dict[a] = 'value for a';
// now I want to get the value for the last assignment
var value = dict[b];
// value doesn't exits :s
How to make something like that. TO not be to heavy as a lot of data will be flowing there.
I have an idea to use the toString() method but I would have to make custom classes.. I would like something fast..
Why not make a special class that encapsulates an array, put methods in there to add and remove elements from the array, and then you could make a special method (maybe getValueByObject(), whatever makes sense). Then you could do:
var mySpecialArrayClass:MySpecialArrayClass = MySpecialArrayClass();
var a:Object = {a:3};
var b:Object = {a:3};
mySpecialArrayClass.addElement(a,'value for a');
var value = mySpecialArrayClass.getValueByObject(a);
I could probably cook up a simple example of such a class if you don't follow.
Update:
Would something like this help?
http://snipplr.com/view/6494/action-script-to-string-serialization-and-deserialization/
Update:
Could you use the === functionality? if you say
if ( object === object )
it compares the underlying memory address to see if two objects are the same reference...