Anyone knows more simple way to make Reverse and take first and last letter?

Question

As you can see i use start index from arr[0] and arr.last(); but anyone can suggest another way to do the same thing more simple?

    public static string F(string s)
    {
        char[] arr = s.ToCharArray();
        Array.Reverse(arr);

        if (s.Length >= 2)
            return new string(arr)[0] + "" + arr.Last();
        else
            return s;
    }

On reversing strings: http://stackoverflow.com/questions/228038/best-way-to-reverse-a-string — , Mar 16 '14 at 13:01

score 7 · Accepted Answer · answered Mar 16 '14 at 12:59

7

You can do it like this, you don't need Array.Reverse:

public static string F(string s)
{
   if (s.Length >= 2)
        return new string(new[] { s[s.Length - 1], s[0] });
    else
        return s;

}

answered Mar 16 '14 at 12:59

Selman Genç

100,147
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184

score 5 · Answer 2 · answered Mar 16 '14 at 13:02

If you take always the first and the last character of the string then the reversion is irrelevant and you can directly use the index and just swap the otput:

var input = "abcdefg";
Console.WriteLine("{1} - {0}", input[0], input[input.Length - 1]);

Output is:

g - a

score 1 · Answer 3 · answered Mar 16 '14 at 14:38

1

public static string F(string s)
{
     return s.Length >= 2 ? new string(new[] { s.Last(), s.First() }) : s;
}

answered Mar 16 '14 at 14:38

evilone

22,410
7
80
107

Anyone knows more simple way to make Reverse and take first and last letter?

3 Answers3