Question

Possible Duplicate:
Checking existence of properties in JavaScript

I am trying to get the first row of a table’s tbody cells (i.e. this.tBodies[0].rows[0].cells) without using jQuery. If there are not any, I do not wish to cause an error.
The following seems to work, but is there a better way?

var tbody_cells = (this.tBodies
  && this.tBodies
  && this.tBodies[0].rows
  && this.tBodies[0].rows[0])
? this.tBodies[0].rows[0].cells
:undefined;

Answer 1

Use a try catch block:

var result;
try{
result = this.tBodies[0].rows[0].cells;
}catch(e if e instanceof ReferenceError){
result = undefined;
}