MongoDB equivalent of Oracle's NVL?

[P A]

Hi,

I am looking to use something to similar to Oracle's NVL feature or MySQL's IFNULL feature. What is the way to accomplish it in MongoDB?

a) Oracle:

NVL ( expr1 , expr2 )

"If expr1 is null, then NVL returns expr2. If expr1 is not null, then
NVL returns expr1."

b) MySQL:

IFNULL(expr1,expr2) 

"If expr1 is not NULL, IFNULL() returns expr1, else it returns expr2."

[Asya Kamsky]

Take a look at aggregation  framework's $ifNull operator.

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