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Apps User Guide

Last updated Oct 30, 2025

Useful VB functions

This page contains VB expressions that you may find useful while building your app.

We grouped several of these functions in a public app, so you can try out them out and see how they behave.

VB function: Where

The Where() function returns a zero-based array containing a subset of a string array based on a specified filter criteria.
Assume you have a variable called words defined as List(Of String) = {"apple", "banana", "cherry", "date"}.
To get the list of words that contain the letter "a", apply the Where() function as follows: 
words.Where(Function(w) w.Contains("a")).ToList()words.Where(Function(w) w.Contains("a")).ToList()
The output is {"apple", "banana", "date"}.

VB function: Select

The Select() function creates a new array that contains the results of applying a lambda expression to each element in the source array.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To get the list of numbers multiplied by themselves, apply the Select() function as follows:
numbers.Select(Function(n) n * n).ToArray()numbers.Select(Function(n) n * n).ToArray()
The output is {1, 4, 9, 16, 25}.

VB function: Aggregate

The Aggregate() function performs calculations over all the elements in an array and returns a single value. This function can be useful in aggregating multiple values inside a column.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To get the sum of all the numbers in the array, apply the Aggregate() function as follows:
Dim sum = numbers.Aggregate(Function(acc, n) acc + n)Dim sum = numbers.Aggregate(Function(acc, n) acc + n)
The output is 15.

VB function: Group By

The GroupBy() function groups elements in a sequence by a key selector function.
Assume you have a variable called words defined as String() = {"apple", "banana", "cherry", "date"}.
To group the words by the first letter, which is the key selector function, apply the GroupBy() function as follows:
words.GroupBy(Function(w) w(0))words.GroupBy(Function(w) w(0))
The output is { {"a", "apple", "date"}, {"b", "banana"}, {"c", "cherry"} }.

VB function: Order By

The OrderBy() and OrderByDescending() functions sort elements in a sequence based on a key selector function.
Assume you have a variable called words defined as String() = {"apple", "banana", "cherry", "date"}.
To order the words by their length, which is the key selector function, apply the OrderBy() function as follows:
words.OrderBy(Function(w) w.Length).ToArray()words.OrderBy(Function(w) w.Length).ToArray()
The output is {"date", "apple", "cherry", "banana"}.

VB function: Join

The Join() function combines elements in two sequences based on a key selector function.

Assume you have two variables:

  • names defined as String() = {"John", "Jane", "Joe"}
  • ages defined as Integer() = {25, 30, 35}
To combine the elements in the first sequence with the elements in the second sequence, apply the Join() function as follows:
names.Join(ages, Function(name) name(0), Function(age) age Mod 10, Function(name, age) $"{name}: {age}")names.Join(ages, Function(name) name(0), Function(age) age Mod 10, Function(name, age) $"{name}: {age}")
The output is {"John: 25", "Jane: 30", "Joe: 35"}.

VB function: First

The First() function returns the first element in a sequence that satisfies a specified condition.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To get the first even number in the sequence, apply the First() function as follows:
numbers.First(Function(n) n Mod 2 = 0)numbers.First(Function(n) n Mod 2 = 0)
The output is 2.

VB function: First Or Default

The FirstOrDefault() function returns the first element, or a default value if no element satisfies the condition.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To get the first odd number in the sequence, apply the FirstOrDefault() function as follows:
numbers.FirstOrDefault(Function(n) n Mod 2 = 1)numbers.FirstOrDefault(Function(n) n Mod 2 = 1)
The output is 1.

VB function: Last

The Last() function returns the last element in a sequence that satisfies a specified condition.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To get the first even number in the sequence, apply the last() function as follows:
numbers.Last(Function(n) n Mod 2 = 0)numbers.Last(Function(n) n Mod 2 = 0)
The output is 4.

VB function: Last Or Default

The LastOrDefault() function returns the last element, or a default value if no element satisfies the condition.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To get the first odd number in the sequence, apply the FirstOrDefault() function as follows:
numbers.LastOrDefault(Function(n) n Mod 2 = 1)numbers.LastOrDefault(Function(n) n Mod 2 = 1)
The output is 5.

VB function: Skip

The Skip() function skips a specified number of elements in a sequence.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To skip the first two elements in the sequence, apply the Skip() function as follows:
numbers.Skip(2).ToArray()numbers.Skip(2).ToArray()
The output is {3, 4, 5}.

VB function: Skip While

The SkipWhile() function skips elements until a condition is no longer satisfied.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To skip the numbers which are lower than 3, apply the SkipWhile() function as follows:
numbers.SkipWhile(Function(n) n < 3).ToArray()numbers.SkipWhile(Function(n) n < 3).ToArray()
The output is {3, 4, 5}.

VB function: Take

The Take() function returns a specified number of elements from the start of a sequence.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To get the first three elements in the sequence, apply the Take() function as follows:
numbers.Take(3).ToArray()numbers.Take(3).ToArray()
The output is {1, 2, 3}.

VB function: Take While

The TakeWhile() returns elements until a condition is no longer satisfied.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To get the numbers which are lower than 4, apply the TakeWhile() function as follows:
numbers.TakeWhile(Function(n) n < 4).ToArray()numbers.TakeWhile(Function(n) n < 4).ToArray()
The output is {1, 2, 3}.

VB function: Any

The Any() function returns true if any element in a sequence satisfies a specified condition.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To find out if at least one number in the sequence is even, apply the Any() function as follows:
numbers.Any(Function(n) n Mod 2 = 0)numbers.Any(Function(n) n Mod 2 = 0)
The output is true.

VB function: All

The All() returns true if all elements in a sequence satisfy a specified condition.
Assume you have a variable called numbers defined as Integer() = {1, 2, 3, 4, 5}.
To find out if all the numbers in the sequence are positive, apply the All() function as follows:
numbers.All(Function(n) n > 0)numbers.All(Function(n) n > 0)
The output is true.

VB function: Add item to list

The list function AddItemToList() adds a new item to an existing list.
Assume you want to manipulate the records in an Edit Grid control with data from a process integration, using the Set Value rule. The item to set is Processes.ALLDATATYPES.out_genericList.
To add an item to the generic list, assign it the following value:
AddItemToList(Processes.ALLDATATYPES.out_genericList, MainPage.EditGrid.NewItem)AddItemToList(Processes.ALLDATATYPES.out_genericList, MainPage.EditGrid.NewItem)

VB function: Delete item from list

The list function DeleteItemFromList() deletes items from an existing list.
Assume you want to manipulate the records in an Edit Grid control with data from a process integration, using the Set Value rule. The item to set is Processes.ALLDATATYPES.out_genericList.
To delete an item from the generic list, assign it the following value:
DeleteItemFromList(Processes.ALLDATATYPES.out_genericList, MainPage.EditGrid.RowIndex)DeleteItemFromList(Processes.ALLDATATYPES.out_genericList, MainPage.EditGrid.RowIndex)

VB function: Update list item at index

The list function UpdateListItemAtIndex() updates items in an existing list.
Assume you want to manipulate the records in an Edit Grid control with data from a process integration, using the Set Value rule. The item to set is Processes.ALLDATATYPES.out_genericList.
To update an item in the generic list, assign it the following value:
UpdateListItemAtIndex(Processes.ALLDATATYPES.out_genericList, MainPage.EditGrid.RowIndex, MainPage.EditGrid.SelectedItem)UpdateListItemAtIndex(Processes.ALLDATATYPES.out_genericList, MainPage.EditGrid.RowIndex, MainPage.EditGrid.SelectedItem)

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