A first-class object is an entity within a programming language that can: Appear in an expression. Be assigned to a variable. Be used as an argument. Be returned by a function call.

What does first class mean in programming?

A programming language is said to have First-class functions when functions in that language are treated like any other variable. For example, in such a language, a function can be passed as an argument to other functions, can be returned by another function and can be assigned as a value to a variable.

How do you determine if something is a first-class object?

In short, anything is a first-class object if it acts in the language as a state manipulation sort of object or type of object. Simply something you can operate on and pass around statements and evaluate in expressions at the same time.