# Delete Duplicates 
* **Objective**
	* To write methods which remove duplicate elements from an array.
* **Purpose**
	* To demonstrate practical understanding of arrays, loops, and basic composition.
* **Instructions**
    * Given an object, `IntegerDuplicateDeleter`, with a composite `Integer[]` object, write a method
        * `removeDuplicatesExactly` which removes all values in the array which occur exactly the specified number of times.
        * `removeDuplicates` which removes all values in the array which occur at least the specified number of times.
	<br><br>
    * Given an object, `StringDuplicateDeleter`, with a composite `String[]` object, write a method
        * `removeDuplicatesExactly` which removes all values in the array which occur exactly the specified number of times.
        * `removeDuplicates` which removes all values in the array which occur at least the specified number of times.

* **Restrictions**
    * No use of any built-in data structures, (`Collection`, `List`, `Map`)
    * Operations should be [idempotent](https://stackoverflow.com/questions/1077412/what-is-an-idempotent-operation)
        * If the input is the same, then the outputs of the methods should **always** be the same, regardless of how many times the method is called.

















<br><br><br><br>
## `removeDuplicateExactly(n)`

### Example 1
* Sample Script

    ```
    // : Given
    Integer[] array = new Integer[]{1,1,1,23,23,56,57,58};
    DuplicateDeleter<Integer> deleter = new IntegerDuplicateDeleter(array);
    
    // : When
    Integer[] actual = deleter.removeDuplicateExactly(3);
    
    // : Then
    System.out.println(Arrays.toString(actual));
    ```

* Sample Output

    ```
    [23,23,56,57,58]
    ```
    
    
    

### Example 2
* Sample Script

    ```
    // : Given
    Integer[] array = new Integer[]{1,1,1,23,23,56,57,58};
    DuplicateDeleter<Integer> deleter = new IntegerDuplicateDeleter(array);
    
    // : When
    Integer[] actual = deleter.removeDuplicateExactly(1);
    
    // : Then
    System.out.println(Arrays.toString(actual));
    ```

* Sample Output

    ```
    [1,1,1,23,23]
    ```
    
    
    

### Example 3
* Sample Script

    ```
    // : Given
    Integer[] array = new Integer[]{0, 0, 0, 1, 1, 2, 3, 3, 3, 4, 4, 5, 5, 5, 5};
    DuplicateDeleter<Integer> deleter = new IntegerDuplicateDeleter(array);
    
    // : When
    Integer[] actual = deleter.removeDuplicateExactly(3);
    
    // : Then
    System.out.println(Arrays.toString(actual));
    ```

* Sample Output

    ```
    [1, 1, 2, 4, 4, 5, 5, 5, 5]
    ```



















<br><br><br><br>
## `removeDuplicates(n)`

### Example 1
* Sample Script

    ```
    // : Given
    Integer[] array = new Integer[]{1,1,1,23,23,56,57,58};
    DuplicateDeleter<Integer> deleter = new IntegerDuplicateDeleter(array);
    
    // : When
    Integer[] actual = deleter.removeDuplicateExactly(1);
    
    // : Then
    System.out.println(Arrays.toString(actual));
    ```



* Sample Output

    ```
    []
    ```




### Example 2
* Sample Script

    ```
    // : Given
    Integer[] array = new Integer[]{0, 0, 0, 1, 1, 2, 3, 3, 3, 4, 4, 5, 5, 5, 5};
    DuplicateDeleter<Integer> deleter = new IntegerDuplicateDeleter(array);
    
    // : When
    Integer[] actual = deleter.removeDuplicates(2);
    
    // : Then
    System.out.println(Arrays.toString(actual));
    ```



* Sample Output

    ```
    [2]
    ```



### Example 3
* Sample Script

    ```
    // : Given
    Integer[] array = new Integer[]{0, 0, 0, 1, 1, 2, 3, 3, 3, 4, 4, 5, 5, 5, 5};
    DuplicateDeleter<Integer> deleter = new IntegerDuplicateDeleter(array);
    
    // : When
    Integer[] actual = deleter.removeDuplicates(3);
    
    // : Then
    System.out.println(Arrays.toString(actual));
    ```



* Sample Output

    ```
    [1,1,2,4,4]
    ```
    
    
    
    
    
    
    
    
    
    
<br><br><br><br>
## Idempotence

### Example 1
* Sample Script

    ```
    // : Given
    Integer[] array = new Integer[]{0, 0, 0, 1, 1, 2, 3, 3, 3, 4, 4, 5, 5, 5, 5};
    DuplicateDeleter<Integer> deleter = new IntegerDuplicateDeleter(array);
    deleter.removeDuplicates(0);
    deleter.removeDuplicates(1);
    deleter.removeDuplicates(2);
    
    // : When
    Integer[] actual = deleter.removeDuplicates(3);
    
    // : Then
    System.out.println(Arrays.toString(actual));
    ```



* Sample Output

    ```
    [1,1,2,4,4]
    ```
    

### Example 2
* Sample Script

    ```
    // : Given
    Integer[] array = new Integer[]{1,1,1,23,23,56,57,58};
    DuplicateDeleter<Integer> deleter = new IntegerDuplicateDeleter(array);
    deleter.removeDuplicates(0);
    deleter.removeDuplicates(1);
    deleter.removeDuplicates(2);
    
    // : When
    Integer[] actual = deleter.removeDuplicatesExactly(3);
    
    // : Then
    System.out.println(Arrays.toString(actual));
    ```



* Sample Output

    ```
    [23,23,56,57,58]
    ```