How to check if object within object exists

Question

It seems that the following technique for checking the existence of an object member produces an error because the \'bar\' parent object hasn\'t been declared before the che

Answer 1

It can be done simply using the code below:

var newVal = (foo && foo.bar && typeof foo.bar.myVal !== 'undefined') ? foo.bar.myVal : foo.bar.myVal

A property is null or undefined, it will be evaluated as false so the above code will only process up to the first 'false' statement.