Second and Third Class Objects
Raphael Finkel offers definitions of second and third class objects (or, as he calls them, values). However, his definition of "first class object" is contrary to other authors': specifically, he does not require run-time constructability, so he would consider C functions to be first-class.
| Manipulation | First | Second | Third |
|---|---|---|---|
| Pass value as a parameter | yes | yes | no |
| Return value from a procedure | yes | no | no |
| Assign value into a variable | yes | no | no |
Read more about this topic: First-class Citizen
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