How to handle passing/returning array pointers to emscripten compiled code?

I'm new to Emscripten/javascript as well as this Overstack community. I apologize, in advance, if my situation has already been addressed.

From a windows 7 environment, I've used emcc to compile a simple c program which accepts an array and modifies it (see below).

double* displayArray(double *doubleVector) {

   for (int cnt = 0; cnt < 3; cnt++) 
       printf("doubleVector[%d] = %f\n", cnt, doubleVector[cnt]);

   doubleVector[0] = 98;
   doubleVector[1] = 99;
   doubleVector[2] = 100;

   for (int cnt1 = 0; cnt1 < 3; cnt1++) 
       printf(" modified doubleVector[%d] = %f\n", cnt1, doubleVector[cnt1]);

   return doubleVector;

}

int main() {

   double d1, d2, d3;
   double array1[3];
   double *array2;

   array1[0] = 1.00000;
   array1[1] = 2.000000;
   array1[2] = 3.000000;

   array2 = displayArray(array1);

   for (int cntr =0; cntr < 3; cntr++)
       printf("array1[%d] = %f\n", cntr, array1[cntr]);

   for (int cnt = 0; cnt < 3; cnt++)
       printf("array2[%d] = %f\n", cnt, array2[cnt]);

   return 1;

}

Using the -o options for emcc , I generated a .html file which I loaded to a browser (Chrome).

python emcc displayArray7.c -o displayArray7.html -s EXPORTED_FUNCTIONS="['_main', '_displayArray'

Upon loading, I see that the output being generated within the browser window is as expected (see below).

doubleVector[0] = 1.000000
doubleVector[1] = 2.000000
doubleVector[2] = 3.000000
modified doubleVector[0] = 98.000000
modified doubleVector[1] = 99.000000
modified doubleVector[2] = 100.000000
array1[0] = 98.000000
array1[1] = 99.000000
array1[2] = 100.000000
array2[0] = 98.000000
array2[1] = 99.000000
array2[2] = 100.000000

However, when using the module.cwrap() command via javascript console and attempting to invoke the function directly (outside of main()) ,

> displayArray=Module.cwrap('displayArray','[number]',['[number]'])

> result = displayArray([1.0,2.0,3.0])
[1, 2, 3]
> result
[1, 2, 3]

I am seeing the following being generated/displayed in the browser which is NOT what I expect to see.

doubleVector[0] = 0.000000
doubleVector[1] = 0.000000
doubleVector[2] = 0.000000
modified doubleVector[0] = 100.000000
modified doubleVector[1] = 100.000000
modified doubleVector[2] = 100.000000   

I have the following questions:

1. Do I have the syntax correct for the return type and parameter listing correct in my call to Module.cwrap()? I've successfully run the simple, straight-forward example of int_sqrt() in the "Interacting with code" section of the tutorial which deals with passing non-pointer variables to the int_sqrt() routine.

2. Is there something different that is happening when arrays and/or pointers are passed to (or returned from) the emscripten-generated javascript code?

3. How is that the generated output in the browser of the function, displayArray(), works (as expected) when called from main(); but not via the javascript console?

I am new to Emscripten/javascript so any info/assistance will be greatly appreciated.

Thank you,

FC