choose
The choose function returns one of the specified objects based on a boolean parameter.
Note: This method should be used instead of if (), which has been deprecated.
Syntax
choose( boolean, object1, object2 )
Arguments
- boolean
- 
    The boolean operation to use when determining which object to return. 
- object1
- 
    The first object to consider returning. 
- object2
- 
    The second object to consider returning. 
Returns
If the boolean parameter is true, the first object is returned; otherwise, the second object is returned.
Note: All parameters are evaluated, even the one that's not returned.
Defined
Gecko support
Supported.