how to convert list into set in salesforce

The simplest way to convert List to Set in Salesforce is given below: List<String> tempList = new List<String> (); Set<String> tempSet = new Set<String> ();

Full Answer

Is it possible to convert a list to a set?

JSON is a CPU hog; you may as well loop over your Set and cast each element individually at that point. You should not use JSON for converting a list to a set or vice versa. As an aside, you're also abusing a compiler bug by casting a List<String> to a List<Id>. You should be prepared for runtime exceptions if you do this.

Can you use lists as parameters in Salesforce functions?

As many Salesforce Apex programmers know, in Salesforce it’s pretty much an unchallenged best practice that all code should be able to handle bulk inserts, updates, etc. When adhering to this best practice, it’s really common to use sets, or lists as parameters in functions.

How to assign the value of list to set?

You can assign the value of list to set by using predefine methods of Set. Please let me know if this helps you! You need to sign in to do that. Need an account?

What is the difference between a set and a list?

Apex uses a hash structure for all sets. The fundamental differences between sets and lists is that a Set is unordered and unique. To access elements in a set, you must iterate through all of the items. So, you can not do code like this:

How do I assign a Set to a list in Salesforce?

The simplest way to convert List to Set in Salesforce is given below: List tempList = new List(); Set tempSet = new Set(); tempList.

How do I convert a list to a map in Salesforce?

Converting List to Map://Converting list to map.Map mapFromList = new Map(leadList);

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.

How do I convert a Set to a string in Salesforce?

Converting Set into String String setString = string. valueof(setdata). replace('{', ”).

How do I add a value to a map in Salesforce?

Once you have instantiated a map, you can add values to the map simply by using the put() method. However, if you happen to have a list of sObjects you can just pass that list in the constructor like so: Map accountsById = new Map(listOfAccounts);

How do I make a map in Apex?

To declare a map, use the Map keyword followed by the data types of the key and the value within <> characters. For example: Map country_currencies = new Map(); Map> m = new Map>(); You can use the generic or specific sObject data types with maps.

How do I create a Set in Salesforce?

How to use Set in SalesforceSyntax:Creating a set: Set variable name=new Set(); ... add(SetElement): It inserts an element into the Set. ... addAll(fromlist|fromset): It inserts list of elements or set of elements into the set.remove(Element): ... removeAll(List|Set): ... contains(Element): ... size():More items...•

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.

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.

Can we convert list to Set in Apex?

Converting from a List to Set, can be done using the set's constructor. List lStrings = new List{ 'a' , 'b' , 'c' , 'd' , 'e' }; Set sStrings = new Set(lStrings); Converting from a Set to a List, can be done using the List constructor.

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';

How do you initialize a Set in Apex?

To declare a set, use the Set keyword followed by the primitive data type name within <> characters. For example: Set myStringSet = new Set(); The following example shows how to create a set with two hardcoded string values.

What is the difference between a set and a list?

The fundamental differences between sets and lists is that a Set is unordered and unique. To access elements in a set, you must iterate through all of the items. So, you can not do code like this: Instead, your code must do something like this: For a list, either method would be perfectly acceptable.

What is addall in collections?

Both types of collections also have an addAll method that can be used to add items to an already existing collection . There’s also, some pretty cool tricks to add the Ids of an element to a Set if you want to check if you have already processed an item or something like that.

Can you use sets in Apex?

As many Salesforce Apex programmers know, in Salesforce it’s pretty much an unchallenged best practice that all code should be able to handle bulk inserts, updates, etc. When adhering to this best practice, it’s really common to use sets, or list s as parameters in functions. Sometimes, there’s a need to convert between lists, or sets, or maybe even maps.