Collection comparers

This library offers three implementations of IEqualityComparer<T>:

• ListEqualityComparer<T>
• BagEqualityComparer<T>
• SetEqualityComparer<T>

These represent three different strategies by which IEnumerable<T> objects may be compared for equality.

List equality

Two enumerable objects are equal using the list equality strategy if:

• All items in both compared objects are equal
  • All items in A must be present in B, and vice-versa
• Any duplicated items are present in the same quantity in both objects
• The order of the items is the same across both compared objects

Bag equality

Two enumerable objects are equal using the bag equality strategy if:

• All items in both compared objects are equal
  • All items in A must be present in B, and vice-versa
• Any duplicated items are present in the same quantity in both objects
• The order of the items is irrelevant

Set equality

Two enumerable objects are equal using the set equality strategy if:

• All items in both compared objects are equal
  • All items in A must be present in B, and vice-versa
• Duplicated items are irrelevant
  • An item may appear in one object many times but in the other only once and the collections would still be considered equal
• The order of the items is irrelevant