Flash eval ( ) vs. Array operator
What’s the difference between eval ( ) and Array operator [ ” ” ]? According to this article Scope Chain and Memory waste in Flash MX,
eval can resolve a path:
var val = eval ( “obj.prop.prop.prop.prop” )
the Array operator can only retrieve an immediate property of an object:
var val = obj [ “prop” ]
eval can even resolve to class methods:
var obj = {numbers: {a:.1, b:.4 } };
var num = eval ( “obj.numbers.a” ) + obj.numbers [ “b” ];
var roundedNum = eval ( “Math.round” ) ( num );
trace( num ); // traces .5
trace( roundedNum ); // traces 1
var num = eval ( “obj.numbers.a” ) + obj.numbers [ “b” ];
var roundedNum = eval ( “Math.round” ) ( num );
trace( num ); // traces .5
trace( roundedNum ); // traces 1
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jgraup said,
February 22, 2007 @ 10:45 am
Eval() on the left side of an argument causes error
http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=tn_16187
Although this code was allowed in Macromedia Flash 5, it actually deviates from the ECMA-262 standard. Macromedia Flash MX is now fully ECMA-262 complaint and no longer allows this structure when authoring a Macromedia Flash Player 6 SWF.
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