Say I have an array which has the following values
A B A A B C
How do I run a code which will increment the integer variables a, b, and c according to the amount of the times they occur in the array
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as a hint, I'd suggest running a distinct list and use the intersect (or potentially Count()) method thereafter on one list against the other...jim tollan– jim tollan2015-07-03 16:08:43 +00:00Commented Jul 3, 2015 at 16:08
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2 Answers
You can use GroupBy:
var array = new string[] {"A", "B", "A", "A", "B", "C" };
var counts = array
.GroupBy(letter => letter)
.Select(g => new { Letter = g.Key, Count = g.Count() });
If you want to get the counts individually, you can put everything into a dictionary
var countsDictionary = array
.GroupBy(letter => letter)
.ToDictionary(g => g.Key, g => g.Count());
var aCount = countsDictionary["A"];
var bCount = countsDictionary["B"];
//etc...
5 Comments
jim tollan
plus one dave - exactly what I would have suggested (and/or distinct with count)
Bone
what if the values aren't letters, but like words.
Lukos
Why does it need to be that complicated? What's wrong with Enumerable.Count()?
Dave Bish
Does the addition of the dictionary method explain it?
Dave Bish
@Lukos - That loops over the list n. times - less efficient I'd suggest (depends on the array, though)
Look at the example at the bottom of https://msdn.microsoft.com/en-us/library/vstudio/bb535181%28v=vs.100%29.aspx
It basically does what you need.
var array = new string[] {"A", "B", "A", "A", "B", "C" };
int a = array.Count(p => p == "A");
