Helpful Operations for Completing the Collections Master Console UI Exercise

1. Using Array.Reverse()

The Array.Reverse() method is used to reverse the elements of an array in place.

Example:

int[] numbers = { 1, 2, 3, 4, 5 };
Array.Reverse(numbers);

// The array `numbers` now contains: { 5, 4, 3, 2, 1 }

How to Use:

Call Array.Reverse(arrayName) where arrayName is the array you want to reverse.

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2. Clearing a List

The List<T>.Clear() method removes all elements from the list, making it empty.

Example:

List<int> numberList = new List<int> { 1, 2, 3, 4, 5 };
numberList.Clear();

// The list `numberList` is now empty

How to Use:

Call listName.Clear() where listName is the list you want to clear.

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3. Checking the Capacity of a List

The List.Capacity property returns the number of elements that the list can hold before needing to resize.

Example:

List<int> numberList = new List<int> { 1, 2, 3 };
int capacity = numberList.Capacity;

// `capacity` will contain the current capacity of `numberList`

How to Use:

Access listName.Capacity where listName is the list whose capacity you want to check.

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4. Sorting an Array or List

Sorting an Array: To sort an array, you can use the Array.Sort() method.

Example:

int[] numbers = { 5, 3, 8, 1, 2 };
Array.Sort(numbers);

// The array `numbers` is now sorted: { 1, 2, 3, 5, 8 }

Sorting a List: To sort a list, you can use the List.Sort() method.

Example:

List<int> numberList = new List<int> { 5, 3, 8, 1, 2 };
numberList.Sort();

// The list `numberList` is now sorted: { 1, 2, 3, 5, 8 }

How to Use:

Call Array.Sort(arrayName) for arrays or listName.Sort() for lists.

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5. Converting a List to an Array

You can convert a list to an array using the List<T>.ToArray() method.

Example:

List<int> numberList = new List<int> { 1, 2, 3, 4, 5 };
int[] numberArray = numberList.ToArray();

// `numberArray` now contains the elements of `numberList` as an array

How to Use:

Call listName.ToArray() to convert the list to an array.

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6. Removing Odd Numbers from a List

To remove odd numbers from a list, you can loop through the list and remove each odd number.

Example:

List<int> numberList = new List<int> { 1, 2, 3, 4, 5 };

for (int i = numberList.Count - 1; i >= 0; i--)
{
    if (numberList[i] % 2 != 0)
    {
        numberList.RemoveAt(i);
    }
}

// `numberList` now contains only even numbers: { 2, 4 }

How to Use:

Use a loop to check each element, and if it's odd, remove it using listName.RemoveAt(index).

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