script assertion

Hi, not being a programmer could anyone suggest a way to check if the property "apples" has a number rather than just null for example. So below is the result of running a test. I can easily ask SOAP to check if there is an item called "apples" but I have no idea how to ask if "apples" equals a numerical value- any value not just 111.

{  

"CONTENT":   

{      "apples": 111,  

},

.......in my own language.... I have a test in SOAP- one element of that test = "apples". I want to add a SCRIPT Assertion that checks that the test has created a Value for "apples" and not just a blank or "0".

thanks in advance

.....almost total non-programmer