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Core Syntax
var declarations const declarations Number and int String values Boolean values Array literals Object literals Operators if statements switch statements
Loops & Functions
for loop for each loop while loop do while loop Function declaration Function expressions Default parameters Rest parameters Return values Closures
Classes & OOP
package class Constructor public and private getters and setters Inheritance override Interfaces static members final classes
Collections & XML
Vector.<T> Array methods Dictionary Object property lookup E4X XML literals XML attributes XMLList Namespace in XML JSON.parse JSON.stringify
Events
EventDispatcher addEventListener removeEventListener Custom Event MouseEvent KeyboardEvent Event bubbling stopPropagation TimerEvent ENTER_FRAME
Display List
Sprite MovieClip Shape graphics addChild removeChild DisplayObject properties Bitmap and BitmapData TextField Filters Masks
Async & Networking
URLRequest URLLoader URLVariables Loader ProgressEvent IOErrorEvent SecurityErrorEvent Socket SharedObject navigateToURL
Runtime & Utilities
try catch finally throw Error is operator as operator getDefinitionByName describeType ByteArray Date RegExp trace
ActionScript 3 Complete Course / Core Syntax

var declarations

Learn var declarations in ActionScript 3 with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.

10 min read • Beginner

var declarations is an atomic ActionScript 3 topic inside Core Syntax. The example below uses the actual construct named by the lesson rather than a generic placeholder.

Focus on what var declarations changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.

Topic-specific example

actionscript-01-01-var-declarations.as
actionscript Try It Live 
var score:int = 10;
trace(score);
Edge case / engineering note

Change the key input in this ActionScript 3 example and predict the result first; the named construct should be the reason the behavior changes.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

var declarations Mastery Check →
NEXT →
const declarations