To declare a set, use the Set keyword followed by the primitive data type name within <> characters. For example: Set<String> myStringSet = new Set<String>();
Full Answer
How to use set in Salesforce?
How to use Set in Salesforce. Set is a collection of similar elements, and they are unordered. Elements can be of any data type. Set doesn't allow any duplicate values. We can't access a set element at a specific index, and we can only iterate over set elements. Set<DataType> variable name=new Set<DataType>();
What is permission set in Salesforce?
What isPermission set? A permission set is a collection of settings and permission that give users access to various functions.The settings and permissions in permissions sets are also found in profiles, but permission sets extend user’s functional access without changing their profiles.
What are outbound change sets in Salesforce?
An outbound change set is a change you send from the Salesforce org you are logged into to another org. To view outbound change sets, from Setup, enter Outbound Change Setsin the Quick Findbox, then select Outbound Change Sets. To create a new change set, click New.
What are set elements?
Set elements can be of any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types. This table represents a set of strings that uses city names: Sets can contain collections that can be nested within one another.
How do I create a Set in Salesforce?
How to use Set in SalesforceSyntax:Creating a set: Set
How is a Set defined in Apex?
A set is an unordered collection of elements that do not contain any duplicates. Set elements can be of any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types.
What are the methods of Set in Salesforce?
There are several kinds of methods available in the set class. So, here are the list methods in Salesforce.add(set Element)addAll(SetElement)clear()clone()add(index, setElement)equals(set2)removeAll(setOfElementsToRemove)remove(setElement)More items...•
What is Set object in Salesforce?
Sets can contain sObjects among other types of elements. Sets contain unique elements. Uniqueness of sObjects is determined by comparing the objects' fields. For example, if you try to add two accounts with the same name to a set, with no other fields set, only one sObject is added to the set.
What is difference between Set and list in Salesforce?
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. Whereas, Set is an unordered collection of elements that do not contain any duplicates.
Why we use Set in Salesforce?
Set: A set is an unordered collection of primitives or sObjects that do not contain any duplicate elements. So, use set if you want to make sure that your collection should not contain Duplicates.
How do I convert a list to a Set in Salesforce?
Converting from a List to Set, can be done using the set's constructor. List
How do I add a list to a Set in Salesforce?
You can assign the value of list to set by using predefine methods of Set. List
What is Set ID in Salesforce?
In apex, the Id is a primitive data type that maintains the data integrity of the data type by only allowing only Ids(or Strings with Id patterns). If you would like to test it out, put the following into anonymous apex and execute: Id errorId = '001aaaaaaaaaaaa';
Why Set is unordered in Salesforce?
A sorted/unordered collection means that not only does the collection have order, but the order depends on the value of the element. A SortedSet is an example. In contrast, a collection without any order can maintain the elements in any order. A Set is an example.
How do I assign permissions to a Set in Salesforce?
From Setup, enter Users in the Quick Find box, then select Users.Select a user.In the Permission Set Assignments related list, click Edit Assignments.To assign a permission set, select it under Available Permission Sets and click Add. ... Click Save.
Can we use Set in SOQL query?
No issues at all. Yes we can.
What is a set in a collection?
Until now, you’ve created one type of collection, a list. A set is an unordered set of unique items of the same type. Similar to a list, a set is a group of items, called elements, and all elements have the same data type, such as string, integer, or even Account.
What is an Apex list?
As you already learned, a list is an ordered collection of items with the same data type. Each item has a position called an index. This makes it easy to retrieve items in the list by the numbered index. But Apex collections are more than just lists. The other two types of collections are sets and maps.
What are the parameters of the put method?
The put method expects two parameters: key and value. Let’s create a map of tea types (keys) and their flavor profiles (values).
Why can't a set have duplicates?
Because the elements are unordered , a set can't have any duplicates. If you try to add an element that’s already in the set, you don’t get an error, but the new value is not added to the set. Remember that when you loop through a list, you always access its items in the order that the items were added to the list.
When provided with an existing key, the get method returns the value of the key.?
When provided with an existing key, the get method returns the value of the key. If the provided key is not mapped to a value, the get method returns null. Remember that the map declaration specifies the data type it expects for a return value. The variable that returns a value must be the same data type that the map declaration specifies.
Can you index a set with a list?
Remember that sets don’t allow repeated values. Also, keep in mind you can’t index a set like you can with a List. Sets are typically used for checking if a certain value is included.
What is set method?
The Set methods work on a set, that is, an unordered collection of elements that was initialized using the set keyword. Set elements can be of any data type—primitive types, collections, sObjects, user-defined types, and built-in Apex types. Set methods are all instance methods, that is, they all operate on a particular instance of a Set. The following are the instance methods for sets.
What is the operator used to compare the elements of a set?
Two sets are equal if their elements are equal, regardless of their order. The == operator is used to compare the elements of the sets.
How to determine uniqueness of a set of user defined types?
Uniqueness of set elements of user-defined types is determined by the equals and hashCode methods, which you provide in your classes. Uniqueness of all other non-primitive types is determined by comparing the objects’ fields.
How to create a new instance of a set class?
Creates a new instance of the Set class by copying the elements of the specified set. T is the data type of the elements in both sets and can be any data type.
What does compares this set with the specified set return?
Compares this set with the specified set and returns true if both sets are equal; otherwise, returns false.
Is a set of elements case sensitive?
If the set contains String elements, the elements are case-sensitive. Two set elements that differ only by case are considered distinct.
Creating a set
In another way, we can assign values dynamically when we are creating a Set,
contains (Element)
It checks whether the given element is in Set or not. If it is there it will return true.
What is change set in Salesforce?
Change sets in Salesforce are the newest method for deploying code and components and provides some enhanced functionality. It uses packages
Who must be authorized to send and receive change sets?
Each Org must be authorized to send and receive change sets.
Learning Objectives
Follow Along with Trail Together
- Want to follow along with an expert as you work through this step? Take a look at this video, part of the Trail Together series on Trailhead Live. (This clip starts at the 49:06 minute mark, in case you want to rewind and watch the beginning of the step again.)
Introduction
- As you already learned, a list is an ordered collection of items with the same data type. Each item has a position called an index. This makes it easy to retrieve items in the list by the numbered index. But Apex collections are more than just lists. The other two types of collections are sets and maps.
Sets
- Until now, you’ve created one type of collection, a list. A set is an unordered set of unique items of the same type. Similar to a list, a set is a group of items, called elements, and all elements have the same data type, such as string, integer, or even Account. Unlike a list, a set maintains no particular order for its elements. Because the elem...
Set Methods
- Each type of collection has its own methods. You added Black, White, and Herbal to a list of tea types with the commonly used addmethod. To learn more about set methods, see the Resources at the end of this unit. Add a Duplicate Value to a Set 1. In the Tea class, replace the orderTea method (lines 2–8) with this code:public static void orderTea(){ Set<String> teaTypes = new Set …
Maps
- A map is a more complex collection than either a list or a set. Each item in a map has two parts: a key and a value, known as a key-value pair. Keys and values can be any data type. Although each key is unique, values can be repeated within a map. Imagine a map of telephone country codes. The country code is the key and the name of the country is the value. Each country code is uniqu…
Resources
- Apex Developer Guide: Apex Set Methods
- Apex Developer Guide: Maps
- Apex Developer Guide: Apex Map Methods