A set can contain up to seven levels of nested collections inside it, that is, up to eight levels overall. To declare a set, use the Set keyword followed by the primitive data type name within <> characters. For example:
What is collections in Salesforce?
Salesforce Collections Salesforce Collections Collections are the group of similar types. There are three types of Salesforce collections. They are List Set Map List List is an ordered collection of elements which will allow duplicates.
What is a set in Salesforce?
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. This table represents a set of strings that uses city names: Sets can contain collections that can be nested within one another.
How do set methods work in Salesforce?
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.
What is Set collection in Salesforce?
A Set in Salesforce is an unordered collection of elements that contain any type of data type like primitive types, collections, sObjects, user-defined types, and built-in Apex types. Set methods in Salesforce do not allow duplication. The insertion order is not preserved in the Set.
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.
What is the difference between list Set and map in Salesforce?
The list is a type of ordered collection that maintains the elements in insertion order, Set is a type of unordered collection and Map is a collection of key-value pairs.
How many collections can you have in Salesforce?
Salesforce has three types of collections: List collection. Set collection. Map collection.
What is difference between list and Set?
List is an ordered sequence of elements whereas Set is a distinct list of elements which is unordered.
Are sets ordered Apex?
Apex uses a hash structure for all sets. A set is an unordered collection—you can't access a set element at a specific index. You can only iterate over set elements. The iteration order of set elements is deterministic, so you can rely on the order being the same in each subsequent execution of the same code.
What are the different types of collections you can have in Apex?
There are three different types of collections in apex: List, Set and Map.
When should I use collections in Apex?
List, Set and map are collections used in apex. These are useful when governor limits are reached to a limit while querying records inside the for loop. Instaed of writing query and reaching the limit we can use set to get ID's of the records and iterate through it.
What is collection list set map in Salesforce?
MapsCollection TypeDescriptionListAn ordered group of items of the same type. Each item has an index number that represents its position in the list.SetAn unordered group of unique items of the same type.MapA collection of key-value pairs. Each unique key maps to a single value.
Can we convert list to set in Salesforce?
The simplest way to convert List to Set in Salesforce is given below: List
What is batch apex in Salesforce?
Batch Apex is used to run large jobs (think thousands or millions of records!) that would exceed normal processing limits. Using Batch Apex, you can process records asynchronously in batches (hence the name, “Batch Apex”) to stay within platform limits.
How many records a list can hold in Salesforce?
A list can hold 1000 elements(as per the limit).
addAll (fromList)
Adds all of the elements in the specified list to the set if they are not already present.
addAll (fromSet)
Adds all of the elements in the specified set to the set that calls the method if they are not already present.
containsAll (listToCompare)
Returns true if the set contains all of the elements in the specified list. The list must be of the same type as the set that calls the method.
containsAll (setToCompare)
Returns true if the set contains all of the elements in the specified set. The specified set must be of the same type as the original set that calls the method.
equals (set2)
Compares this set with the specified set and returns true if both sets are equal; otherwise, returns false.
removeAll (listOfElementsToRemove)
Removes the elements in the specified list from the set if they are present.
removeAll (setOfElementsToRemove)
Removes the elements in the specified set from the original set if they are present.