Question

When there is a single dimension array, it is easy to check whether it is defined, by either simple calling arr[6] which will return undefined if such property does not exist or calling typeof arr[6] === undefined.

The problem is, that in my case I have arr[5][1][6][2][5][3][7], where arr[5] can be non existent, or arr[5][1], etc. Which will naturally trigger error: TypeError: Cannot read property [..] One solution is to write many IF statements. However, is there any better solution, that’d simple allow me to check whether arr[5][1][6][2][5][3][7] is defined?

Answer 1

I can’t think of anything better than:

var defined = false;
try {
   defined = !!arr[5][1][6][2][5][3][7]
} catch(e)
{
   // nothing
}

But seriously bad design.