Enum
Also written: enumeration
An enumeration defines a type with a fixed set of named constant values, simplifying code and preventing errors.
An enumeration, often called an enum, is a way to create a custom data type that can only hold one of a specific, predefined set of values. Think of it like a multiple-choice question where only certain answers are allowed.
For example, instead of using numbers like 0, 1, or 2 to represent different "modes" in a program, you could define an enum called `Mode` with named options like `Mode.READ`, `Mode.WRITE`, and `Mode.EXECUTE`. This makes your code easier to read and understand, and it helps prevent mistakes by ensuring you only use valid options.
An enumeration (enum) is a distinct data type that comprises a set of named constants, referred to as enumerators. The underlying representation is typically an integer type, but the language enforces that only the defined enumerators can be assigned to a variable of that enum type. This provides type safety and improves code readability by replacing magic numbers with meaningful identifiers.
Enums are useful for representing states, options, or categories where the set of possible values is known and fixed. They prevent runtime errors that could occur from using invalid values and make the code's intent clearer.
The term 'Enum' appears in relation to Google Gemini's API documentation. This suggests that developers using Gemini's tools are working with code examples that define specific sets of options or states for their applications, highlighting the practical use of enums in building AI-powered features.
- Gemini API Cookbook: fix(quickstarts): correct grammar in Enum notebook (#1325)Google · Gemini API Cookbook ·
- Google Gemini
- Google Gemini's API documentation includes examples and guides that utilize enumerations to define specific sets of options or states for developers working with the API.
- Enumeration
- A broader term referring to the process of listing things one by on
- Set
- A collection of distinct items, but a set does not typically enforce a fixe
The concept of enumerations in programming dates back to early languages like Ada and C. The term 'enum' itself was popularized by C and has since been adopted by many other programming languages. Source ↗
If you are learning to code with Python, try defining a simple enum for directions: `from enum import Enum; class Direction(Enum): NORTH = 1; SOUTH = 2; EAST = 3; WEST = 4`. Then, create a variable `my_direction = Direction.NORTH` and print it to see how the enum value is represented.
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Questions people ask
- What is an enum in simple terms?
- An enum is like a special list of named options for a variable. Instead of using numbers, you use names like 'RED', 'GREEN', or 'BLUE' to represent choices.
- Why use enums instead of just numbers?
- Enums make your code easier to read because the names clearly show what each option means. They also prevent errors by ensuring you only use valid, predefined options.
First seen on Subvolts Aug 19, 2026. Updated Sep 15, 2026. Written by an AI model from the items above and reviewed against them weekly; report an error.