fun getDouble(name: String, defaultValue: Double): Double
Returns the double value of the member with the specified name in this object. If
this object does not contain a member with this name, the given default value is returned. If
this object contains multiple members with the given name, the last one will be picked. If this
member's value does not represent a JSON number or if it cannot be interpreted as Java
double, an exception is thrown.
name - the name of the member whose value is to be returned
defaultValue - the value to be returned if the requested member is missing
Return
the value of the last member with the specified name, or the given default value if
this object does not contain a member with that name