How to correct no text displayed in "alert();" function?

Hello AEScriptingComm,
 you were highly recommended by David of Pro Video Coalition.
I hoped you could help using the alert(vals) in ExtendScript in After Effects.
When i run the script all works but,..
1)
a) ..the resulting Script Alert contains no text or numeric info, AND,..
b) its not the "AE" style alert window the tutorial shows when alert(vals) is used?
Here is the .jsx script code:
var prop1 = app.project.item(1).layer(1).property("ADBE Transform
Group").property("ADBE Position");
var keyLength = prop1.numkeys;
var vals
 = new Array();
for(var k=0; k<keyLength; k++)
vals[vals.length] = prop1.keyValue(k+1);
alert(vals);
Any help or instructions greatly appreciated,
J

Really appreciate and will use your instructions and code segments ID1215.
As much as i loved assembly, VXD and c++ games/graphics coding with ring 0 access, i should have known to debug the most obvious error in my AE project that failed an otherwise functional script.
Part B)
If i may guys i have one last question the tutorer will hopefully answer soon, and which is the ultimate goal and reason i'm learning ExtendScripts:
I have a few dozen AI, imported Shape Layers with paths "Created..from Vector Layers" in After Effects.
In order to use a .jsxbin script to change every path to the same number of verticies i must 1st convert them to Keyframes on the same Mask Path property.
1) could you please show\send an example showing how to,..
a) Get\Retrieve "KeyValue" from multiple, single (Shape Layers):Outlines > Contents > Group > Path > Path as shown in screenshot "4-CreateShapeFromVecLyr2Outlines.JPG",
and then,..
b) "SetValue" from those paths into Mask > Mask Path keyframes also in screenshot "1-ExtendScript_ShapePathsTOMaskPathKeyframes.JPG"?
esp. appreciate your patience in light of my most resent fumble, there go my wide reciever dreams, lol,
Jeff

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