What is a first-class function? Provide two scenarios where you would implement this concept.

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First class objects in a language are handled uniformly throughout. They may be stored in data structures, passed as arguments, or used in control structures. A programming language is said to support first-class functions if it treats functions as first-class objects.

Properties of first class functions:

A function is an instance of the Object type.
You can store the function in a variable.
You can pass the function as a parameter to another function.
You can return the function from a function.
You can store them in data structures such as hash tables, lists, …

First Class Functions and Closures are concepts that open the way for Functional Programming. As a result, higher order functions are possible and can be used to work with collections or to create decorators.

First class functions make it easy to pass around units of behavior and work with functions like with any other value.

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venereology answered 4 hours ago

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