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Duplicate items added in ConcurrentSkipListSet


By : Arjan Loeffen
Date : October 16 2020, 06:10 PM
may help you . You have broken the contract of compareTo, which results in undefined behaviour.
code :
final Item x = new Item("yyyy", index.getAndIncrement());
final Item z = new Item("bbbb", index.getAndIncrement());
final Item y = new Item("yyyy", index.getAndIncrement());

System.out.println(x.compareTo(y));
System.out.println(x.compareTo(z));
System.out.println(y.compareTo(z));
0
-1
1


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Prevent duplicate items from being added to a ListBox


By : Stephen P
Date : March 29 2020, 07:55 AM
This might help you If you bind the lstBoxToUserProjects list box to a datasource (HashSet) then you could do a simple check to see if the item proposed for selection was already in the destination:
code :
foreach(ListItem itemToAdd in itemsToAdd)
{
    if (selectedItems.Contains(itemToAdd)) continue;
    lstBoxToUserProjects.Items.Add(itemToAdd);
}

Preventing duplicate items to be added into a checkedlistbox


By : user2270423
Date : March 29 2020, 07:55 AM
this will help When facing issues like these, test-driven development is a good way to solve the problem.
Start by setting up your class to be tested and a test (we'll ignore mocks and stuff for the moment)
code :
public class MyClass {
  private readonly List<Item> q = new List<Item>();
  private readonly List<Item> checkedItems = new List<Item>();

  public ICollection<Item> Q
  {
     get { return q; }
  }

  public ICollection<Item> CheckedItems
  {
     get { return checkedItems; }
  }

  public void TransferItems() {
    // todo:
  }
}

public class Item { }
[TestFixture]
public class MyClassTest {
  [Test]
  public void NewItemsAreAddedWhenCheckedItemsIsEmpty() {
    // arrange
    Item expectedItem = new Item();
    MyClass tester = new MyClass();
    tester.Q.Add(expectedItem);

    // act
    tester.TransferItems();

    // assert
    int actualCount = tester.CheckedItems.Count;
    int expectedCount = 1;

    Assert.Equals(actualCount, expectedCount);

    var actualItem = tester.CheckedItems[0];
    Assert.AreSame(actualItem, expectedItem);
  }

  [Test]
  public void NewItemsAreAddedWhenCheckedItemsContainsElements() {
    // arrange
    Item expectedItem = new Item();
    MyClass tester = new MyClass();
    tester.Q.Add(expectedItem);
    tester.CheckedItems.Add(new Item());

    // act
    tester.TransferItems();

    // assert
    int actualCount = tester.CheckedItems.Count;
    int expectedCount = 2;

    Assert.Equals(actualCount, expectedCount);

    var expectedContains = tester.CheckedItems.Contains(expectedItem);
    Assert.IsTrue(expectedContains);
  }
}
public class MyClass {
  private readonly List<Item> q = new List<Item>();
  private readonly List<Item> checkedItems = new List<Item>();

  public ICollection<Item> Q
  {
     get { return q; }
  }

  public ICollection<Item> CheckedItems
  {
     get { return checkedItems; }
  }

  public void TransferItems() {
    IEnumerable<Item> itemsToAdd = q.Where(item => !checkedItems.Contains(item));
    checkedItems.AddRange(itemsToAdd);
  }
}

How to prevent duplicate items from being added to an IRepository?


By : Aleksandar Nikolaev
Date : March 29 2020, 07:55 AM
should help you out If _repository.Collection is a collection of ScoreModel objects, you cannot do a Contains with a string. You need to do the check with the specific property you want to avoid duplicates on.
So, replace this part:
code :
!_repository.Collection.Contains(SelectedSubjectName)
_repository.Collection.All(s=>s.Subject != SelectedSubjectName)

Duplicate items are not added to the list


By : Serik
Date : March 29 2020, 07:55 AM
around this issue It's not clear why you expect duplicates to be gone, since you haven't actually done anything to remove them.
Adding .distinct() to the stream chain might help, though.
code :
periodCodes.stream()
    .flatMap(periodCode -> 
        yearMonths.stream()
            .filter(YearMonth.of(periodCode.getYear(), periodCode.getMonth())::equals)
            .map(ym -> periodCode))
    .collect(toList())

Prevent duplicate items being added to cart in PHP


By : hwbllmnn
Date : March 29 2020, 07:55 AM
may help you . I'm using a session array to store products in a cart. , try to do something like this
code :
$array = $_SESSION['tocoto_cart'];

$key = array_search($result_product['ProductID'], array_column($array, 'ProductID')); 

if($key !== false) {
    $status = "Selected product is already in your cart.";
} else {
    $status = $result_product['ProductName'] . " added to your cart.";
    $_SESSION['tocoto_cart'] = array_merge( $_SESSION['tocoto_cart'], $cart_array );
}
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