First-class objects are an important concept in object-oriented programming.

In object-oriented programming, a class is a first-class entity.

The conference brought together various first-class entities from different industries.

In object-oriented programming, a first-class object is an entity that can be dynamically created, destroyed, passed as a parameter, and returned as a result.

In object-oriented programming, a first-class value is a value that can be dynamically created, passed as a parameter, and returned as a result.

First-class continuations are a powerful feature in programming languages.

She received a first-class continuation in her studies.

The first class matches were highly competitive.

The privates first class were promoted to sergeants.

The petty officer first class is responsible for leading a team of sailors.