TheDeveloperBlog.com

Home | Contact Us

C-Sharp | Java | Python | Swift | GO | WPF | Ruby | Scala | F# | JavaScript | SQL | PHP | Angular | HTML

<< Back to VBNET

VB.NET HashSet Example

Use HashSet to store unique elements. HashSet is an optimized set collection.
HashSet is an optimized set collection. We use it to eliminate duplicates from a collection in a VB.NET program. With HashSet we use the constructor to convert a String array into a set. This also eliminates all duplicates.
Example. We declare a String array of six Strings. Three of these strings are equal. Next, we create a HashSet using the generics syntax in the VB.NET language. The sole argument to the HashSet New function is an IEnumerable(Of String).

Note: Recall that the String array implements the IEnumerable interface, which means it can be used by any method that handles IEnumerable.

Finally: We convert back into a String array: all the duplicate Strings were removed.

VB.NET program that uses HashSet Module Module1 Sub Main() ' String array. Dim a As String() = {"cat", "dog", "cat", "leopard", "tiger", "cat"} Console.WriteLine(String.Join(" ", a)) ' Create HashSet. Dim hash As HashSet(Of String) = New HashSet(Of String)(a) ' String array. a = hash.ToArray() Console.WriteLine(String.Join(" ", a)) End Sub End Module Output cat dog cat leopard tiger cat cat dog leopard tiger
Join. One interesting thing about this program is the use of the String.Join Shared function. With String.Join, you can convert an array into a String. This makes the above program require fewer lines.Join
Summary. With the HashSet collection type, you can collapse duplicate elements of an array. We showed String arrays here. But this approach works with other types as well. HashSet implements ISet, which means it also has many helpful Functions.

Note: SortedSet is also available. It uses a different implementation for looking up keys. Usually a hashed algorithm is faster.

Dictionary
© TheDeveloperBlog.com
The Dev Codes

Related Links:

.Net

.NET Array Dictionary List String 2D Async DataTable Dates DateTime Enum File For Foreach Format IEnumerable If IndexOf Lambda LINQ Parse Path Process Property Regex Replace Sort Split Static StringBuilder Substring Switch Tuple

Java

Core Array ArrayList HashMap String 2D Cast Character Console Deque Duplicates File For Format HashSet If IndexOf Lambda Math ParseInt Process Random Regex Replace Sort Split StringBuilder Substring Switch Vector While

Related Links

Adjectives Ado Ai Android Angular Antonyms Apache Articles Asp Autocad Automata Aws Azure Basic Binary Bitcoin Blockchain C Cassandra Change Coa Computer Control Cpp Create Creating C-Sharp Cyber Daa Data Dbms Deletion Devops Difference Discrete Es6 Ethical Examples Features Firebase Flutter Fs Git Go Hbase History Hive Hiveql How Html Idioms Insertion Installing Ios Java Joomla Js Kafka Kali Laravel Logical Machine Matlab Matrix Mongodb Mysql One Opencv Oracle Ordering Os Pandas Php Pig Pl Postgresql Powershell Prepositions Program Python React Ruby Scala Selecting Selenium Sentence Seo Sharepoint Software Spellings Spotting Spring Sql Sqlite Sqoop Svn Swift Synonyms Talend Testng Types Uml Unity Vbnet Verbal Webdriver What Wpf