Finding an empty string in an array beginning at a specified index

Question

I want to check if an empty string exists in an array after a specified index.

Suppose I have this array:

string[] values = {"1", "2", "2", "4", "", "", ""};

I want to check if an empty value exists from index 3 (where the value is 4). I want to do this without splitting it inter two different arrays of strings.

More specifically my example using an array named files

string[] files;

I want to check from array index 8 to array index 28 if there are any empty values.

ii want to check whether there is an empty value in the string from a specified index to end . — user3913587
– user3913587, Commented Oct 14, 2014 at 5:06

Ilian · Accepted Answer · 2014-10-14 05:15:33Z

3

You can do it with LINQ:

files.Skip(index).Any(s => s == string.Empty);

answered Oct 14, 2014 at 5:15

Ilian

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1 Comment

AdamMc331 Over a year ago

Great idea. Way more concise and (possibly) more efficient than looping.

AdamMc331 · Accepted Answer · 2014-10-14 05:14:10Z

0

You can just use a for loop. Try this:

for(int i = specifiedIndex; i < array.Length; i++)
{
    if(array[i].Equals(""))
        return true;
}
return false;

This will return true if any of the values at or after the index are empty. If it reaches the end without finding one, it returns false.

You can adjust this to fit your needs. You don't necessarily have to loop the the end of the array, you can set the end condition to a specified index too, say if you wanted to check for an empty string between indexes 5 and 10 but don't care if there are any before or after that.

edited Oct 14, 2014 at 5:14

answered Oct 14, 2014 at 5:08

AdamMc331

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Comments

Rahul Singh · Accepted Answer · 2014-10-14 05:22:52Z

0

Use LINQ:-

string[] Values = { "1", "2", "2", "4", "", "", "" };
            int specifiedIndex = 3;
            var query1 = Values.Skip(specifiedIndex).Select((v, index) => new { v, index }).Where(x => x.v == String.Empty).Select(z => z.index + specifiedIndex);

            foreach (var val in query1)
            {
                Console.WriteLine(val);
            }

answered Oct 14, 2014 at 5:22

Rahul Singh

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3 Comments

AdamMc331 Over a year ago

I don't think OP needs a list of the empty strings, just whether or not one exists.

Rahul Singh Over a year ago

Yup...noticed that just now. I though he need all those index position where array has empty string.

AdamMc331 Over a year ago

Yeah I can see how it could be misread. Your answer really isn't wrong. It was one of those things where I normally wouldn't be nit picky - but I like to help avoid confusion when I can.

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