A user-defined object is an instance of a user-defined type, typically a class, or an enum.
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They are user-defined. In other words: You & Me (Users) define them (make them). There is an endless number of user-defined exceptions
to create user defined functions the user defined data is needed nd its useful to the programmer to create its own data.
A user-defined region is one that is classified by use. eg. hydro-electricity region
[object Object]
String - is primitive data typestring - is user defined data type