How to delete element from array?

Question

I have an string array like this

K={"book","handbook","car"}

I would like to check if any string contains other string,if it does I would like to remove it from array .In the case of array K,new array should be like this

K="{"book","car"}

for (i = 0; i < 10; i++)
            {

                if (keywords.Contains(keywords[i])) { 

                      //I have no idea for this part
                }

            }

Possible duplicate of [Remove element of a regular array](http://stackoverflow.com/questions/457453/remove-element-of-a-regular-array) — Andrew Whitaker, May 16 '16 at 18:39
Possible duplicate of http://stackoverflow.com/q/8032394/3279496 — nelek, May 16 '16 at 18:40
use a list or other structure if you want to manipulate data. — Marshall Tigerus, May 16 '16 at 18:40
An array has a set size. You can't go from 3 items to 2. You can overwrite an items value, but you can't alter the size of the array. — Jonesopolis, May 16 '16 at 18:48

score 1 · Answer 1 · answered May 16 '16 at 18:48

1

It might make more sense to use a List<>, a data structure designed for editing, whereas an array is a fixed structure. But, assuming you have an array, and need to end up with a modified array, you could convert:

IEnumerable<string> invalid_words = // ... list of words K cannot contain
string[] K = // .. array of strings you are given
K = K.Where(p => !invalid_words.Contains(p)).ToArray();

answered May 16 '16 at 18:48

payo

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actually there is no list of words K cannot contain.It all about K itself.I will give another example.If K={"car","cars","cab"} then new K should {"car","cab"} because car is the root of cars – info perto May 16 '16 at 19:06

score 0 · Answer 2 · answered May 16 '16 at 19:29

This might be a little "smelly" but it's better than try to modify the array when you are in an iteration.

The idea is this: save all the indexes where the word appears, and then erase those words. This is not the best solution, but it can help you with your problem. I highly recommends you to read about "Lists" because there are great on C# and it's easier use them than use arrays

K="{"book","car"};
//Never use a number, try to use the .length propertie
List<int> indexes=new List<int>();//using lists is easier than arrays
enter code here
for (i = 0; i < K.length; i++)
        {

            if (keywords.Contains(K[i])) 
            { 
                  //You save the index where the word is
                  indexes.add(i);
            }

        }
//Here you take those indexes and create a new Array
int[] theNewArray=new int[K.length-indexes.Count];
int positionInTheNewArray=0;
    for (i = 0; i < K.length; i++)
        {
         if(!indexes.Contains(i))
             {     theNewArray[positionInTheNewArray]=K[i];
                   positionInTheNewArray++;
             }
        }

}

That fits if your array allows duplicated words and also if duplicated words are not allowed.

How to delete element from array?

2 Answers2