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Recently had an interviewer ask to define the difference between objects and primitives. Seemed like an odd question considering that all languages begin with a primitive. How would you have answered this question?
I should also note that this interview was for a front-end development position so the language (I assume) he was referring to was JavaScript.
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Primitive data types are predefined. Object data types are user-defined. These data types are held in a stack. In these data types, the original object is kept in the heap, and the reference variable is kept in the stack.
Java has a two-fold type system consisting of primitives such as int, boolean and reference types such as Integer, Boolean. Every primitive type corresponds to a reference type. Every object contains a single value of the corresponding primitive type.
In JavaScript, a primitive (primitive value, primitive data type) is data that is not an object and has no methods or properties. There are 7 primitive data types: string.
Non-Primitive data types refer to objects and hence they are called reference types.
A primitive is a data type that is composed of no other data types and can not be broken down any further. It is like the atoms in the programming scenario. I say atom because atom is a basic unit of matter and there is nothing that can be derived from it.
I mean, an int in C can not be broken down into smaller data type. An object, on the other hand can be thought of a molecule, consisting of more than one primitive type. For example, string comes as part of the C++ standard library; however, it is an object and it is composed of smaller data types internally and contains methods.
It is important to note that not all object-oriented languages are class based (eg. Javascript) You can not define a class in Javascript, so an object is quite different here. Even though everything in Javascript is an object (Ruby also), the Number object is really a wrapper for an internal primitive.
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