first class， first-class object

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本文解释了一等公民对象的概念，即能在程序中动态创建、销毁、传递给函数、作为返回值的对象，拥有与其他变量相同的权利。此外，还探讨了不同编程语言中一等公民对象的具体表现形式。

In short, it means there are no restrictions on the object's use. It's the same as any other object.

A first class object is an entity that can be dynamically created, destroyed, passed to a function, returned as a value, and have all the rights as other variables in the programming language have.

Depending on the language, this can imply:

being expressible as an anonymous literal value
being storable in variables
being storable in data structures
having an intrinsic identity (independent of any given name)
being comparable for equality with other entities
being passable as a parameter to a procedure/function
being returnable as the result of a procedure/function
being constructible at runtime
being printable
being readable
being transmissible among distributed processes
being storable outside running processes