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50 Learn to Program in Dart: Enums

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Dart Programming – Enumeration

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Syntax

Example

Dart Programming – Enumeration

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Summary of article content: Articles about Dart Programming – Enumeration Kiểu enum trong Dart còn gọi là kiểu liệt kê (kiểu liệt kê thứ tự enumerated) được sử dụng để liệt kê các giá trị hằng số. Kiểu liệt kê được … …
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Syntax

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Dart Programming – Enumeration

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Summary of article content: Articles about Data Enumeration in Dart – GeeksforGeeks Enumerated types (also known as enumerations or enums) are primarily used to define named constant values. The enum keyword is used to … …
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Dart

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Summary of article content: Articles about enums – Does Dart support enumerations? – Stack Overflow Beginning 1.8, you can use enums like this: enum Fruit { apple, banana } main() { var a = Fruit.apple; switch (a) { case Fruit.apple: … …
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enums – Does Dart support enumerations? – Stack Overflow

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Summary of article content: Articles about Flutter & Dart: ENUM Example – Kindacode An enumeration in Dart is a set of symbolic names (members) bound to unique, constant values. Within an enumeration, the members can be compared … …
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Flutter & Dart: ENUM Example - Kindacode — Flutter & Dart: ENUM Example – Kindacode

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Summary of article content: Articles about Dart Enum Enums are a crucial component of computer languages. They assist developers in defining a small collection of predetermined values that will be used … …
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What is Enum in Dart in Ubuntu 2004

How to Use the Enum in Dart in Ubuntu 2004

Example # 1 Program to Print Enum Element in a Dart in Ubuntu 2004

Example # 2 Program to Print Enum Element Through Iteration in a Dart in Ubuntu 2004

Example # 3 Program of an Enum Using Switch Case in a Dart in Ubuntu 2004

Example # 4 Program of an Enum Using Enum Elements in a Class in a Dart in Ubuntu 2004

Conclusion

Dart Enum

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Summary of article content: Articles about compareByName method – Enum class – dart:core library – Dart API API docs for the compareByName method from the Enum , for the Dart programming language. …
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compareByName method – Enum class – dart:core library – Dart API

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compareByName method – Enum class – dart:core library – Dart API

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Dart Programming – Enumeration

Dart Programming – Enumeration

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An enumeration is used for defining named constant values. An enumerated type is declared using the enum keyword.

Syntax

enum enum_name { enumeration list }

Where,

The enum_name specifies the enumeration type name

specifies the enumeration type name The enumeration list is a comma-separated list of identifiers

Each of the symbols in the enumeration list stands for an integer value, one greater than the symbol that precedes it. By default, the value of the first enumeration symbol is 0.

For example

enum Status { none, running, stopped, paused }

Example

enum Status { none, running, stopped, paused } void main() { print(Status.values); Status.values.forEach((v) => print(‘value: $v, index: ${v.index}’)); print(‘running: ${Status.running}, ${Status.running.index}’); print(‘running index: ${Status.values[1]}’); }

It will produce the following output −
[Status.none, Status.running, Status.stopped, Status.paused] value: Status.none, index: 0 value: Status.running, index: 1 value: Status.stopped, index: 2 value: Status.paused, index: 3 running: Status.running, 1 running index: Status.running

Data Enumeration in Dart

Enumerated types (also known as enumerations or enums) are primarily used to define named constant values. The enum keyword is used to define an enumeration type in Dart. The use case of enumeration is to store finite data members under the same type definition.

Syntax: enum variable_name{ // Insert the data members as shown member1, member2, member3, …., memberN }

Let’s analyze the above syntax:

The enum is the keyword used to initialize enumerated data type. The variable_name as the name suggests is used for naming the enumerated class. The data members inside the enumerated class must be separated by the commas. Each data member is assigned an integer greater than then the previous one, starting with 0 (by default). Make sure not to use semi-colon or comma at the end of the last data member.

Example 1: Printing all the elements from the enum data class.

Dart

enum Gfg { Welcome, to, GeeksForGeeks } void main() { for (Gfg geek in Gfg.values) { print(geek); } }

Output:

Gfg.Welcome Gfg.to Gfg.GeeksForGeeks

Note: Notice in the above example the strings are not enclosed with quotes, so that it can be used to print different results by comparing them with the values inside the enum.

Example 2: Using switch-case to print result.

Dart

enum Gfg { Welcome, to, GeeksForGeeks } void main() { var geek = Gfg.GeeksForGeeks; switch (geek) { case Gfg.Welcome: print( “This is not the correct case.” ); break ; case Gfg.to: print( “This is not the correct case.” ); break ; case Gfg.GeeksForGeeks: print( “This is the correct case.” ); break ; } }

Output:

This is the correct case.

Note: The enumerated class does not hold all types of data, rather it stores only string values without the quotes over them.

Limitation of Enumerated Data Type:

It cannot be subclassed or mixed in. It is not possible to explicitly instantiate an enum.

Does Dart support enumerations?

With r41815 Dart got native Enum support see http://dartbug.com/21416 and can be used like

enum Status { none, running, stopped, paused } void main() { print(Status.values); Status.values.forEach((v) => print(‘value: $v, index: ${v.index}’)); print(‘running: ${Status.running}, ${Status.running.index}’); print(‘running index: ${Status.values[1]}’); }
[Status.none, Status.running, Status.stopped, Status.paused]
value: Status.none, index: 0

value: Status.running, index: 1

value: Status.stopped, index: 2

value: Status.paused, index: 3

running: Status.running, 1

running index: Status.running

A limitation is that it is not possibly to set custom values for an enum item, they are automatically numbered.

More details at in this draft https://www.dartlang.org/docs/spec/EnumsTC52draft.pdf

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Dart Programming – Enumeration

Dart Programming – Enumeration

Data Enumeration in Dart – GeeksforGeeks

enums – Does Dart support enumerations? – Stack Overflow

Flutter & Dart: ENUM Example – Kindacode

Dart Enum

compareByName method – Enum class – dart:core library – Dart API

compareByName method – Enum class – dart:core library – Dart API

Dart Programming – Enumeration

Data Enumeration in Dart

Does Dart support enumerations?

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