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<HTML>
<HEAD>
<TITLE>Custom objects and associative object arrays</TITLE>
<SCRIPT>
function showProperties (theObject){
for (i in theObject) {
if (theObject[i] != null) {
document.write(i + " : " + theObject[i] + "<br>");
}
else {
document.write(i + "<br>");
}
}
return;
}
</SCRIPT>
</HEAD>
<BODY>
<SCRIPT>
// constructor function
function Rectangle(height, width){
this.height = height;
this.width = width;
}
function calc_Area () {
return this.height * this.width;
}
// turn the function into an object method
Rectangle.prototype.calcArea = calc_Area;
var theRectangle = new Rectangle (3, 5);
theRectangle.width = 10;
showProperties (theRectangle);
</SCRIPT>
</BODY>
</HTML>
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