On Thu, Oct 9, 2008 at 9:01 PM, Derrell Lipman <
[EMAIL PROTECTED]> wrote:
>
> Hi Stefan. What you describe is exactly the "problem" that I don't
> understand. With a regular expression literal, as with an object literal in
> 'var testobj={x:2}' or an array literal in 'var testarr=[23,42], If
> someplace in that method I say 'testobj.x=3;' the next time into that
> method, it'll reinitialize testobj to an object in which x has the value 2.
> Similarly, I would expect a new instantiation of a regular expression on
> each call into the method. It's not assigned to a static or global variable;
> it's a literal assigned to a local variable. Do you see any rationale for
> the regular expression retaining its state on subsequent calls to doTest()?
> Shouldn't we get a brand new, just-initialized regular expression object
> assigned to illegalChars on each call to doTest()?
>
Here's a minor change to the application to demonstrate what I'm talking
about. We can see that on each call, testobj.x and testarr[0] contain the
values initialized by the object and array literals, respectively, but
illegalChars.lastIndex is clearly referencing the original regular
expressing object, not a newly-instantiated one...
/*
#require(qx.log.appender.Native)
#require(qx.log.appender.Console)
*/
qx.Class.define("custom.Application",
{
extend : qx.application.Standalone,
members :
{
main: function()
{
this.base(arguments);
this.doTest("123123", true);
this.doTest("12b13b", true);
this.doTest("12b13b", true);
this.doTest("12b13b", true);
this.doTest("12b13b", true);
this.doTest("123123", false);
this.doTest("12b13b", false);
this.doTest("12b13b", false);
this.doTest("12b13b", false);
this.doTest("12b13b", false);
this.doTest("12b13b", false);
this.doTest("12b13b", false);
this.doTest("12b13b", false);
this.doTest("12b13b", false);
this.doTest("12b13b", false);
},
doTest : function(s, reset)
{
var illegalChars = /[^0-9]/g;
var testobj = { x : 2 };
var testarr = [ 23, 42 ];
var resetText = "without";
this.debug("lastIndex=" + illegalChars.lastIndex + ", " +
"testobj.x=" + testobj.x + ", " +
"testarr[0]=" + testarr[0]);
if (reset)
{
illegalChars.lastIndex = 0;
resetText = "with";
}
var isIllegal = illegalChars.test(s);
this.debug(s + " " + resetText +
" reset: " + (isIllegal ? "illegal" : "legal"));
testobj.x = 3;
testarr[0] = 223;
}
}
});
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