Assign Default For Large Array

Hello,
As a part of my project I have a array like this myArray[100,100], it is a string array.
I use it to set the text of cards. My problem is that in order for the cards to show, myArray must have a default value. I have tested this by saying,

myArray[1,1] = " ";

and then card 1,1 works.

My question is how would i assign " " to 10000 variables?!
THANKS

You could do something like this:

var arrayLength = 1000;
var myArray = new Array ();

myArray.length = arrayLength;

for(var i = 0; i < myArray.length; i++)
{
   myArray *= " ";*

}