The process of enumerating values, for example from some collection.
Use enums for enumeration types.
Questions tagged [enumeration]
1779 questions
4012
votes
32 answers
How to enumerate an enum
How can you enumerate an enum in C#?
E.g. the following code does not compile:
public enum Suit
{
Spades,
Hearts,
Clubs,
Diamonds
}
public void EnumerateAllSuitsDemoMethod()
{
foreach (Suit suit in Suit)
{
…
Ian Boyd
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1216
votes
38 answers
Enumerations on PHP
I know that PHP doesn't yet have native Enumerations. But I have become accustomed to them from the Java world. I would love to use enums as a way to give predefined values which IDEs' auto-completion features could understand.
Constants do the…
Henrik Paul
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860
votes
16 answers
How to iterate a loop with index and element in Swift
Is there a function that I can use to iterate over an array and have both index and element, like Python's enumerate?
for index, element in enumerate(list):
...
thinker3
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818
votes
15 answers
C# loop - break vs. continue
In a C# (feel free to answer for other languages) loop, what's the difference between break and continue as a means to leave the structure of the loop, and go to the next iteration?
Example:
foreach (DataRow row in myTable.Rows)
{
if…
Seibar
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458
votes
8 answers
How do I iterate over an NSArray?
I'm looking for the standard idiom to iterate over an NSArray. My code needs to be suitable for OS X 10.4+.
Steve McLeod
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279
votes
7 answers
for each loop in Objective-C for accessing NSMutable dictionary
I am finding some difficulty in accessing mutable dictionary keys and values in Objective-C.
Suppose I have this:
NSMutableDictionary *xyz=[[NSMutableDictionary alloc] init];
I can set keys and values. Now, I just want to access each key and value,…
Sagar R. Kothari
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258
votes
8 answers
What does the "map" method do in Ruby?
I'm new to programming. Can someone explain what .map would do in:
params = (0...param_count).map
bigpotato
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241
votes
14 answers
Case objects vs Enumerations in Scala
Are there any best-practice guidelines on when to use case classes (or case objects) vs extending Enumeration in Scala?
They seem to offer some of the same benefits.
Alex Miller
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184
votes
13 answers
foreach vs someList.ForEach(){}
There are apparently many ways to iterate over a collection. Curious if there are any differences, or why you'd use one way over the other.
First type:
List someList =
foreach(string s in someList) {
Bryce Fischer
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183
votes
6 answers
Methods inside enum in C#
In Java, it's possible to have methods inside an enum.
Is there such possibility in C# or is it just a string collection and that's it?
I tried to override ToString() but it does not compile. Does someone have a simple code sample?
Eya
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183
votes
12 answers
How to get the name of enumeration value in Swift?
If I have an enumeration with raw Integer values:
enum City: Int {
case Melbourne = 1, Chelyabinsk, Bursa
}
let city = City.Melbourne
How can I convert a city value to a string Melbourne? Is this kind of a type name introspection available in…
Evgenii
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171
votes
12 answers
Search for a string in Enum and return the Enum
I have an enumeration:
public enum MyColours
{
Red,
Green,
Blue,
Yellow,
Fuchsia,
Aqua,
Orange
}
and I have a string:
string colour = "Red";
I want to be able to return:
MyColours.Red
from:
public MyColours…
Matt Clarkson
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151
votes
2 answers
Why is the enumeration value from a multi dimensional array not equal to itself?
Consider:
using System;
public class Test
{
enum State : sbyte { OK = 0, BUG = -1 }
static void Main(string[] args)
{
var s = new State[1, 1];
s[0, 0] = State.BUG;
State a = s[0, 0];
Console.WriteLine(a…
shingo
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150
votes
10 answers
What is the tilde (~) in the enum definition?
I'm always surprised that even after using C# for all this time now, I still manage to find things I didn't know about...
I've tried searching the internet for this, but using the "~" in a search isn't working for me so well and I didn't find…
hugoware
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127
votes
10 answers
Difference between Java Enumeration and Iterator
What is the exact difference between these two interfaces? Does Enumeration have benefits over using Iterator? If anyone could elaborate, a reference article would be appreciated.
cometta
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