Javascript null conditional expression

Question

Possible duplicate:
null coalescence operator for javascript?

In C # you can do this:

var obj = newObject ?? defaultObject; 

This means that the assignment of newObject is obj , if not null yet assign defaultObject . How to write this in javascript?

Answer 1

While it is considered abuse, you can do the following:

 var obj = newObject || defaultObject; 

Note that if newObject has any falsy value (for example, 0 or an empty string), defaultObject will be returned as obj value. With this in mind, it may be preferable to use either the ternary operator or the standard if statement.

 var obj = ( "undefined" === typeof defaultObject ) ? defaultObject : newObject ;