How to deal with Uncaught TypeError?

[Ted K 1]

/*
Dear all,

<!-- code -->
<script>
function Array2D(x,y){
this.length = x*y;
this.x = x;
this.y = y;

        for(var i=0 ; i<this.length ; i++){
            this\[i\] = null;  
        }
        this.get = function(x,y){ 
            return this\[x\*this.x+y\];
        }
        this.set = function(x,y,value){ 
            this\[x\*this.x+y\] = value;

        }
    }

</script>

<script>
var a2d = Array2D(10,10);
a2d.set(2,3,"2");
alert(this.get(1,2));
</script>
<!-- end code -->

<!-- error message -->
Uncaught TypeError: Cannot read property 'set' of undefined

How does it happen?and what should i do to avoid this?
*/

[Wombaticus]

It's undefined because you ahven't returned anything form your Array2D function. Try adding

return this;

at the end of it. Also, your

alert(this.get(1,2));

shouold be

alert(a2d.get(1,2));

[Ted K 1]

thanks a lot! it works! ;)