Save Duplicate Values From String

Question

I have:

string turtle = "turtle"
var charArray = turtle.ToCharArray()

When I do:

var distinct = charArray.Distinct().ToArray()
// distinct = ["t","u","r","l","e"]

My question is:

How do I save the characters that got deleted from charArray when I called Distinct on it? How do I get the variable distinct to equal "t" (the character that was removed)

Thanks!

http://stackoverflow.com/questions/245369/how-do-i-get-an-array-of-repeated-characters-from-a-string-using-linq — Nick G, Oct 31 '16 at 15:39
remove string distinct from the input string (turtle) and get the delete characters. see this - http://stackoverflow.com/questions/2201595/c-sharp-simplest-way-to-remove-first-occurance-of-a-substring-from-another-str — Wasi Ahmad, Oct 31 '16 at 15:39

score 2 · Accepted Answer · edited Nov 01 '16 at 19:10

2

Use GroupBy to return only the letters having count > 1:

string turtle = "turtle";
var dups = (from l in turtle
            group 1 by l into g
            where g.Count() > 1
            select g.Key).ToList();

edited Nov 01 '16 at 19:10

Pankaj

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answered Oct 31 '16 at 15:39

Gilad Green

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score 1 · Answer 2 · answered Oct 31 '16 at 15:40

var nonUniqueChars = charArray.GroupBy(x => x)
.Where(x => x.Count() > 1)
.Select(x => x.First())

This will organize group all the characters that appear, find the ones that appear more than once, and then pull a single instance of each such character.

Save Duplicate Values From String

2 Answers2