Does list allow duplicates in Apex?

Does list allow duplicates in Apex?

A list is an ordered collection of elements that are distinguished by their indices. List elements can be of any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types. A set is an unordered collection of elements that do not contain any duplicates.

How do you prevent duplicates from a list in Salesforce?

Preventing duplicate records in Salesforce based on a single field can be achieved using a Set that can store the values of that specific field from all existing records and compare it with the list of new records that are going to be inserted.

Can tuple contains duplicate values?

Tuples A Tuple represents a collection of objects that are ordered and immutable (cannot be modified). Tuples allow duplicate members and are indexed.

How to create a new list in apex?

Two list elements that differ only by case are considered distinct. For more information on lists, see Lists. The following are constructors for List. Creates a new instance of the List class.

How does the equals method work in apex?

Apex uses this method to determine equality and uniqueness for your objects. For more information on providing an equals method, see Using Custom Types in Map Keys and Sets. If the list contains String elements, the elements are case-sensitive. Two list elements that differ only by case are considered distinct.

Which is an example of an instance method in apex?

All are instance methods. Adds an element to the end of the list. Inserts an element into the list at the specified index position. Adds all of the elements in the specified list to the list that calls the method. Both lists must be of the same type. Add all of the elements in specified set to the list that calls the method.

What are the namespaces for apex DML operations?

1 Apex DML Operations. 2 ApexPages Namespace. 3 AppLauncher Namespace. 4 Approval Namespace. 5 Auth Namespace. 6 Cache Namespace. 7 Canvas Namespace. 8 ChatterAnswers Namespace. 9 CommercePayments Namespace. 10 ConnectApi Namespace.