Access Javascript nested objects safely

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Standard approach:

var a = b && b.c && b.c.d && b.c.d.e;

is quite fast but not too elegant (especially with longer property names).

Using functions to traverse JavaScipt object properties is neither efficient nor elegant.

Try this instead:

try { var a = b.c.d.e; } catch(e){}

in case you are certain that a was not previously used or

try { var a = b.c.d.e; } catch(e){ a = undefined; }

in case you may have assigned it before.

This is probably even faster that the first option.

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