this pointer question
From: Jayme Pechan (jayme.pechan_at_whitefeld.com)
Date: 02/25/05
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Date: Fri, 25 Feb 2005 13:41:19 -0800
I noticed something that seems strange to me regarding the 'this' pointer
for objects. Note the code below. The output is:
b null
strange problem.
how come b.Success == null but this.Success inside the b object is not null
but instead equal to itself? I did set it = to null before running the
function.
The remarks in Visual Studios JScript reference says the following:
Remarks
The this keyword is typically used in object constructors to refer to the
current object.
Is it possible that unlike C++, the this is only valid in the constructor
and not other functions? It worked for the a.Success one.
var a = new Object();
var b = new Object();
a.Process = function()
{
this.Success();
}
b.Process = function()
{
if (this.Success == null)
WScript.echo("This null");
if (b.Success == null)
WScript.echo("b null");
if (this.Success == b.Process)
WScript.echo("strange problem");
return;
}
a.Success = b.Process;
b.Success = null;
a.Process();
-----------------------------------------
Next I tried the following script:
I got:
strange problem
stranger problem
var a = new Object();
var b = new Object();
var c = new Object();
a.Process = function()
{
this.Success();
}
b.Process = function()
{
if (this.Success == b.Process)
WScript.echo("strange problem");
b.Success();
}
c.Process = function()
{
if (this.Success == c.Process)
WScript.echo("stranger problem");
}
a.Success = b.Process;
b.Success = c.Process;
c.Success = null;
a.Process();
Am I missing something obvious here?
It seems like c.Success = null is the same as c.Success = c.Process perhaps
because it is the first variable in the object?
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