defaultValue()
        Returns the first parameter if not undefined, otherwise the second parameter.
Useful for setting a default value for a parameter.
    
    
    
    
    
    
    
    
    
    
    
    
    
Example:
param = Cesium.defaultValue(param, 'default');
        Source: 
        Core/defaultValue.js, line 17
    
    
Members
- 
    staticdefaultValue.EMPTY_OBJECT
- 
    
    A frozen empty object that can be used as the default value for options passed as an object literal.Source: Core/defaultValue.js, line 28
