first-class object

1. An entity that can be constructed at run-time, passed as a parameter, returned from a function, or assigned into a variable.

2. An entity that can pass a value as a parameter, can be returned from a subroutine, and can be assigned into a variable. (This is the definition according to Raphael Finkel, who uses the terms of second- and third-class objects.)

   First-Class-Objekt

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