Questions tagged [enum]

Enum (also enumeration) is a data type consisting of a set of named values called elements, members or enumerators of the type. The enumerator names are usually identifiers that behave as constants in the language, and are often predefined with an implied ordering.

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What is the best data structure to store 2 keys and 3 values?

Well, I am having two keys and 3 values for that. Say key1,key2,value1,value2,value3. In future may the values can be increased like value4, value5 so on. I need to get the values(value1,value2,...
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How to structure enum data to achieve the desired effect

I'm making a framework for building simple html websites for an embedded system and I want to make it bulletproof in a way that a user can't make mistakes in building the html document. As I've ...
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Would adding enums to my class make my code more compact or efficient?

I am working on a C# class library for my colleagues to use when programming industrial cameras. I'm trying to determine both the most compact and elegant method to write the class. The commands are ...
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Will returning an enum, instead of String, be too restrictive here:

Currently, there are only 3 possible publishers. I might want to add some more in the future: interface NewsArticle { enum Publisher { NYPost, ChiTribune, LATimes } Publisher getPublisher(); ...
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Whether to use enum vs map vs config file?

I have ~30 resources each having ~10 attributes. I want to store some information about each attribute. Ex: its multiplicity, it RW (Read/Write), RO (Read only), longName, shortname. So I was ...
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Enum with a lot of boolean properties

I'm currently working on a webapp where we often need to condition some server logic based on the page that is going to be returned to the user. Each page is given a 4-letter page code, and these ...
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Can't I use an enum at application level if I have a NxN relationship?

After reading the answers to this question, and this and this related questions, I'm now confused about how/if to work with an enum having an NxN relationship. Let's say I have an entity Hotel, an my ...
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Why would you store an enum in DB?

I've seen a number of questions, like this, asking for advice on how to store enums in DB. But I wonder why would you do that. So let's say that I have an entity Person with a gender field, and a ...
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is switch(this) antipattern or bad practice in Java for Enums?

At work I bumped into a problem to see how enums are growing and storing business logics. As they grew, the constructors grew a lot. At one point I found out instead of putting in let's say the tenth ...
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Use of project-specific values with enum defined in class library

We have an enum in a class library: Public Enum FieldType Phone Span Gender DrawPath .... End Enum which we use with an attribute applied to properties, for multiple scenarios: ...
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Understanding Enums in Java

In the book Effective Java its told that: The basic idea behind Java’s enum types is simple: they are classes that export one instance for each enumeration constant via a public static final ...
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When are enums NOT a code smell?

Dilemma I've been reading a lot of best practice books about object oriented practices, and almost every book I've read had a part where they say that enums are a code smell. I think they've missed ...
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What was the first programming language with Enumerations?

I'm reading about Swift enum's in the Swift Programming Language guide and the text was comparing the differences between Swift's enum and C's enum. This made me curious as to where enumerations came ...
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Is it wasteful to create a new database table instead of using enum data type?

Suppose I have 4 types of services I offer (they are unlikely to change often): Testing Design Programming Other Suppose I have 60-80 of actual services that each fall into one of the above ...
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Would combining enums with static strings in java be sloppy?

Currently my team has a number of constants defined as static final strings. I want to be able to iterate over these strings as if they were an enum in one location, but everywhere else they are used ...
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Is enum order sensitivity an antipattern?

Is it an anti-pattern to depend on a particular order of an enum's instance declarations? For example, consider: public enum CompassPoint { North, East, South, West; } These points ...
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One Enum vs Multiple Enums

I am developing an application where a user submits a mission and other users accept the mission. Pretty simple. I want to keep a track of the mission progress status and store it into a database. ...
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Is it okay to go against all-caps naming for enums to make their String representation simpler?

Several times I've seen people use title-case or even all lower-case naming for enum constants, for example: enum Color { red, yellow, green; } This makes working with their string form simple ...
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Java partial enum backed by the database

I have following problem: need to use enum in my java code, since I'll have to ask in my business logic things like if(someting == enumname.VALUE_ENUM){... but I don't have all the enum types at the ...
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Static properties and implicit “self” property in structures and enumerations vs classes in Swift

I am currently reading the Swift language documentation and came across these sentences in the chapter about methods: Similarly, type methods on structures and enumerations can access static ...
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Do enums create brittle interfaces?

Consider the example below. Any change to the ColorChoice enum affects all IWindowColor subclasses. Do enums tend to cause brittle interfaces? Is there something better than an enum to allow for ...
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Enums in java switch-statements and completeness

I feel like I should be able to find an answer to this, but it turns out to be harder to search than expected... so: In C#, when we do something like: enum MyEnumClass { A, B }; static String Test(...
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How can I avoid these nested repetitive ifs?

I'm trying to implement a web interface for a user database. Hosts can create guests for their courses, the guests can get deleted after the course has ended but have to remain in the database for a ...
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Should I use enums or arrays for a dynamic data source?

I've inherited an iOS project that uses NS_Enum to store the number of rows and sections in a UITableView At the moment, the UITableView is static; no rows are being added to it. However, that is what ...
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Enforce coding decision to include or exclude an Enum element in an EnumSet at compile time

I would like to enforce that the elements of a Java Enum are chosen or excluded from an EnumSet at compile time i.e. I am forced to make the decision to put it in the set or not whenever I create a ...
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Open closed principle vs abstraction leaking (Java enums)

In Java, an enum is not a plain replacement for a number (like in C/C++), but a family of objects which can have properties. For instance public enum Order { NAME("Ordering by name"), SURNAME("...
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Is it a good practice to burn business logic into Enums?

Let's have a simplified business logic like this: public enum BusinessLogic { STAGE_ONE(true, false, false), STAGE_TWO(true, true, false), STAGE_THREE(false, false, true); private final ...
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Enum as singleton or fully functional class [duplicate]

Joshua Bloch claims that "a single-element enumeration type is the best way to implement a singleton" Why? I totally disagree with this statement because enumeration is data type with some type-...
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Nullable enumeration values vs. “NoValue” or “Undefined”, etc

I often write code which translates entities in the database to domain objects. These entities often have fields which are constrained and translate to enumerations in the domain objects. In some ...
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Why use a enum to create the singleton pattern [duplicate]

Why would you use an enum to create a singleton pattern? To what purpose would it serve over a conventional singleton pattern? I have seen the above used. The code uses an enum to create this pattern ...
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Is it better to use strings or int to reference enums outside the java part of the system?

We were having a discussion at my work about the use of enums in Java. A coworker was arguing that when using enums on the server-side, whenever required we should use string to reference to it (for ...
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Enumerated types and their interpretation by compilers

It seems to me that a lot, if not most, compilers treat enumerated types as int underneath. In C/gcc, enums are compiled to int. In C#/Visual C#, you can change the underlying data type with something ...
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Explicitly define enum values, even if the default value is the same?

There are times when an enum's values are important: it is not necessary for them to be unique, they also need to have specific values. In such cases, should the values be explicitly defined, even if ...
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How can I mock this architecture?

This is not a very general question, so it may not exactly be appropriate here, but I could sure use a suggestion if you have one: I have an object containing a dictionary keyed off of an enum, ...
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Is there a way for Object 1 to call Object 2's enums in a function call?

For example, if I have two classes "Director" and "Follower". I want the Director to tell the follower where to go (ex: follower1.go(direction.LEFT)), and I want the Director to know what directions ...
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Best approach for multilingual Java Enum

I'm running into issues with an approach I am taking and am now wondering if I just started down the wrong path and should rethink my approach. Here is what I attempting. I would like to use an Enum ...
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1answer
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Several enum classes that declare constants with the same names

I'm working on a Java library for sorts for Magic: the Gathering. Well, without going into a lot of detail, in the game there are five different colors of magic: white, blue, black, red, and green. ...
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Why isn't there a next operation on enums?

In most popular programming languages like Java and C# there is a way to define enums, which are essentially datatypes with a fixed set of values, e.g. DayOfWeek. The problem is, given a value, e.g. ...
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In what situation do Entity Framework enums become useful?

I am working on a project where there will be plenty of static options being stored in the database. I looked at using Enums for this, but do not see how they could be useful. They do not create any ...
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Allowing enum to express a valid combination of values

Suppose in a manufacturing environment, there are certain stock materials available for use in a product. For example, there are only a few different sizes of copper tube, each having a specific ...
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How to unit test a missing case in a switch statement where all cases are true

I often use enum types in my code with a switch to apply logic to each type. In these cases it's important that each enum has code implemented. For example; public enum eERROR { REQUIRED, ...
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constants/enums in API

What are a few ways constants and enums are dealt with when creating an API Client? I'm writing a client in python for our API and I've hit a sticking point with this. We use a lot of mappings to ...
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Are the IETF BCP 47 language tags defined as enums anywhere in JDK?

Are the IETF BCP 47 language tags defined as enums anywhere in JDK? For Locale.forLanguageTag() we pass values like fr-FR, jp-JP etc. Are there any enums already provided by JDK for it? Or should ...
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Which is better to use? (Enum or Constant)

I have my enum like this. enum Size{PAGE_SIZE=20, HEADER_SIZE=30 }; I only use them as constants(No enum variable created) in my program. i.e= int x = PAGE_SIZE + 20; So what is the ...
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How to represent (enum) types in a public API

I am working on a simple API that I want to use for my own client, and to open to the public in the future. I have "Item" objects which can have different "types". The type is a C "typedef enum", for ...
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Compatibility of Enum Vs. string constants

I was recently told that using Enum: public enum TaskEndState { Error, Completed, Running } may have compatibility/serialization issues, and thus sometimes it's better to use const string: public ...
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Could someone explain HaXe enums?

I have AS3/PHP background and some basic understaning of enums from C++. Saying shortly: I read this: http://haxe.org/ref/enums http://haxe.org/doc/cross/more_on_enum And though - good ...
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In what situations does it make sense to use an enumeration when writing object-oriented code?

Enumerations1 are often associated with procedural code rather than object-oriented code. They tend to give rise to similar switch statements scattered through the code, and in general, these are ...
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Does an in-code enumeration provide a stronger domain model than a static table?

Does an in-code enumeration provide a stronger domain model than a static database table? As an example, say I have an Marble entity, with a Color attribute. The color attribute has a finite set of ...
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use of Enum with flags in practice?

I just have read some stuff on enum today. Use of flags with enum was something interesting and new for me. But often practice and theoretical uses are different. I go through many articles they ...